merge: Add support for trace writing

This pull request extends the trace API to support writing new traces.

- Unify columns of different tables 
- Support column lookup via index
- Use index lookup in trace loader 
- Add property for describing partition keys
- Simplify TraceFormat SPI interface
- Add support for writing traces

**Breaking API Changes**

- `TraceFormat` SPI interface has been redesigned.

12 files changed, 286 insertions, 632 deletions

diff --git a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExResourceStateTable.kt b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExResourceStateTable.kt
deleted file mode 100644
index 4a60dff3..00000000
--- a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExResourceStateTable.kt
+++ /dev/null
@@ -1,138 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.trace.bitbrains
-
-import org.opendc.trace.*
-import java.nio.file.Files
-import java.nio.file.Path
-import java.util.stream.Collectors
-import kotlin.io.path.bufferedReader
-import kotlin.io.path.extension
-import kotlin.io.path.nameWithoutExtension
-
-/**
- * The resource state [Table] in the extended Bitbrains format.
- */
-internal class BitbrainsExResourceStateTable(path: Path) : Table {
-    /**
-     * The partitions that belong to the table.
-     */
-    private val partitions = Files.walk(path, 1)
-        .filter { !Files.isDirectory(it) && it.extension == "txt" }
-        .collect(Collectors.toMap({ it.nameWithoutExtension }, { it }))
-        .toSortedMap()
-
-    override val name: String = TABLE_RESOURCE_STATES
-
-    override val isSynthetic: Boolean = false
-
-    override val columns: List<TableColumn<*>> = listOf(
-        RESOURCE_STATE_ID,
-        RESOURCE_STATE_CLUSTER_ID,
-        RESOURCE_STATE_TIMESTAMP,
-        RESOURCE_STATE_CPU_COUNT,
-        RESOURCE_STATE_CPU_CAPACITY,
-        RESOURCE_STATE_CPU_USAGE,
-        RESOURCE_STATE_CPU_USAGE_PCT,
-        RESOURCE_STATE_CPU_DEMAND,
-        RESOURCE_STATE_CPU_READY_PCT,
-        RESOURCE_STATE_MEM_CAPACITY,
-        RESOURCE_STATE_DISK_READ,
-        RESOURCE_STATE_DISK_WRITE,
-    )
-
-    override fun newReader(): TableReader {
-        val it = partitions.iterator()
-
-        return object : TableReader {
-            var delegate: TableReader? = nextDelegate()
-
-            override fun nextRow(): Boolean {
-                var delegate = delegate
-
-                while (delegate != null) {
-                    if (delegate.nextRow()) {
-                        break
-                    }
-
-                    delegate.close()
-                    delegate = nextDelegate()
-                    this.delegate = delegate
-                }
-
-                return delegate != null
-            }
-
-            override fun hasColumn(column: TableColumn<*>): Boolean = delegate?.hasColumn(column) ?: false
-
-            override fun <T> get(column: TableColumn<T>): T {
-                val delegate = checkNotNull(delegate) { "Invalid reader state" }
-                return delegate.get(column)
-            }
-
-            override fun getBoolean(column: TableColumn<Boolean>): Boolean {
-                val delegate = checkNotNull(delegate) { "Invalid reader state" }
-                return delegate.getBoolean(column)
-            }
-
-            override fun getInt(column: TableColumn<Int>): Int {
-                val delegate = checkNotNull(delegate) { "Invalid reader state" }
-                return delegate.getInt(column)
-            }
-
-            override fun getLong(column: TableColumn<Long>): Long {
-                val delegate = checkNotNull(delegate) { "Invalid reader state" }
-                return delegate.getLong(column)
-            }
-
-            override fun getDouble(column: TableColumn<Double>): Double {
-                val delegate = checkNotNull(delegate) { "Invalid reader state" }
-                return delegate.getDouble(column)
-            }
-
-            override fun close() {
-                delegate?.close()
-            }
-
-            private fun nextDelegate(): TableReader? {
-                return if (it.hasNext()) {
-                    val (_, path) = it.next()
-                    val reader = path.bufferedReader()
-                    return BitbrainsExResourceStateTableReader(reader)
-                } else {
-                    null
-                }
-            }
-
-            override fun toString(): String = "SvCompositeTableReader"
-        }
-    }
-
-    override fun newReader(partition: String): TableReader {
-        val path = requireNotNull(partitions[partition]) { "Invalid partition $partition" }
-        val reader = path.bufferedReader()
-        return BitbrainsExResourceStateTableReader(reader)
-    }
-
-    override fun toString(): String = "BitbrainsExResourceStateTable"
-}
diff --git a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExResourceStateTableReader.kt b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExResourceStateTableReader.kt
index f1cf7307..c1b6f5ba 100644
--- a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExResourceStateTableReader.kt
+++ b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExResourceStateTableReader.kt
@@ -88,70 +88,53 @@ internal class BitbrainsExResourceStateTableReader(private val reader: BufferedR
         return true
     }
 
-    override fun hasColumn(column: TableColumn<*>): Boolean {
-        return when (column) {
-            RESOURCE_STATE_ID -> true
-            RESOURCE_STATE_CLUSTER_ID -> true
-            RESOURCE_STATE_TIMESTAMP -> true
-            RESOURCE_STATE_CPU_COUNT -> true
-            RESOURCE_STATE_CPU_CAPACITY -> true
-            RESOURCE_STATE_CPU_USAGE -> true
-            RESOURCE_STATE_CPU_USAGE_PCT -> true
-            RESOURCE_STATE_CPU_DEMAND -> true
-            RESOURCE_STATE_CPU_READY_PCT -> true
-            RESOURCE_STATE_MEM_CAPACITY -> true
-            RESOURCE_STATE_DISK_READ -> true
-            RESOURCE_STATE_DISK_WRITE -> true
-            else -> false
-        }
+    override fun resolve(column: TableColumn<*>): Int = columns[column] ?: -1
+
+    override fun isNull(index: Int): Boolean {
+        require(index in 0..COL_MAX) { "Invalid column index" }
+        return false
     }
 
-    override fun <T> get(column: TableColumn<T>): T {
-        val res: Any? = when (column) {
-            RESOURCE_STATE_ID -> id
-            RESOURCE_STATE_CLUSTER_ID -> cluster
-            RESOURCE_STATE_TIMESTAMP -> timestamp
-            RESOURCE_STATE_CPU_COUNT -> getInt(RESOURCE_STATE_CPU_COUNT)
-            RESOURCE_STATE_CPU_CAPACITY -> getDouble(RESOURCE_STATE_CPU_CAPACITY)
-            RESOURCE_STATE_CPU_USAGE -> getDouble(RESOURCE_STATE_CPU_USAGE)
-            RESOURCE_STATE_CPU_USAGE_PCT -> getDouble(RESOURCE_STATE_CPU_USAGE_PCT)
-            RESOURCE_STATE_MEM_CAPACITY -> getDouble(RESOURCE_STATE_MEM_CAPACITY)
-            RESOURCE_STATE_DISK_READ -> getDouble(RESOURCE_STATE_DISK_READ)
-            RESOURCE_STATE_DISK_WRITE -> getDouble(RESOURCE_STATE_DISK_WRITE)
+    override fun get(index: Int): Any? {
+        return when (index) {
+            COL_ID -> id
+            COL_CLUSTER_ID -> cluster
+            COL_TIMESTAMP -> timestamp
+            COL_NCPUS -> getInt(index)
+            COL_POWERED_ON -> getInt(index)
+            COL_CPU_CAPACITY, COL_CPU_USAGE, COL_CPU_USAGE_PCT, COL_CPU_READY_PCT, COL_CPU_DEMAND, COL_MEM_CAPACITY, COL_DISK_READ, COL_DISK_WRITE -> getDouble(index)
             else -> throw IllegalArgumentException("Invalid column")
         }
-
-        @Suppress("UNCHECKED_CAST")
-        return res as T
     }
 
-    override fun getBoolean(column: TableColumn<Boolean>): Boolean {
-        return when (column) {
-            RESOURCE_STATE_POWERED_ON -> poweredOn
+    override fun getBoolean(index: Int): Boolean {
+        return when (index) {
+            COL_POWERED_ON -> poweredOn
             else -> throw IllegalArgumentException("Invalid column")
         }
     }
 
-    override fun getInt(column: TableColumn<Int>): Int {
-        return when (column) {
-            RESOURCE_STATE_CPU_COUNT -> cpuCores
+    override fun getInt(index: Int): Int {
+        return when (index) {
+            COL_NCPUS -> cpuCores
             else -> throw IllegalArgumentException("Invalid column")
         }
     }
 
-    override fun getLong(column: TableColumn<Long>): Long {
+    override fun getLong(index: Int): Long {
         throw IllegalArgumentException("Invalid column")
     }
 
-    override fun getDouble(column: TableColumn<Double>): Double {
-        return when (column) {
-            RESOURCE_STATE_CPU_CAPACITY -> cpuCapacity
-            RESOURCE_STATE_CPU_USAGE -> cpuUsage
-            RESOURCE_STATE_CPU_USAGE_PCT -> cpuUsage / cpuCapacity
-            RESOURCE_STATE_CPU_DEMAND -> cpuDemand
-            RESOURCE_STATE_MEM_CAPACITY -> memCapacity
-            RESOURCE_STATE_DISK_READ -> diskRead
-            RESOURCE_STATE_DISK_WRITE -> diskWrite
+    override fun getDouble(index: Int): Double {
+        return when (index) {
+            COL_CPU_CAPACITY -> cpuCapacity
+            COL_CPU_USAGE -> cpuUsage
+            COL_CPU_USAGE_PCT -> cpuUsage / cpuCapacity
+            COL_CPU_READY_PCT -> cpuReadyPct
+            COL_CPU_DEMAND -> cpuDemand
+            COL_MEM_CAPACITY -> memCapacity
+            COL_DISK_READ -> diskRead
+            COL_DISK_WRITE -> diskWrite
             else -> throw IllegalArgumentException("Invalid column")
         }
     }
@@ -209,4 +192,21 @@ internal class BitbrainsExResourceStateTableReader(private val reader: BufferedR
     private val COL_CPU_CAPACITY = 18
     private val COL_ID = 19
     private val COL_MEM_CAPACITY = 20
+    private val COL_CPU_USAGE_PCT = 21
+    private val COL_MAX = COL_CPU_USAGE_PCT + 1
+
+    private val columns = mapOf(
+        RESOURCE_ID to COL_ID,
+        RESOURCE_CLUSTER_ID to COL_CLUSTER_ID,
+        RESOURCE_STATE_TIMESTAMP to COL_TIMESTAMP,
+        RESOURCE_CPU_COUNT to COL_NCPUS,
+        RESOURCE_CPU_CAPACITY to COL_CPU_CAPACITY,
+        RESOURCE_STATE_CPU_USAGE to COL_CPU_USAGE,
+        RESOURCE_STATE_CPU_USAGE_PCT to COL_CPU_USAGE_PCT,
+        RESOURCE_STATE_CPU_DEMAND to COL_CPU_DEMAND,
+        RESOURCE_STATE_CPU_READY_PCT to COL_CPU_READY_PCT,
+        RESOURCE_MEM_CAPACITY to COL_MEM_CAPACITY,
+        RESOURCE_STATE_DISK_READ to COL_DISK_READ,
+        RESOURCE_STATE_DISK_WRITE to COL_DISK_WRITE
+    )
 }
diff --git a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExTrace.kt b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExTrace.kt
deleted file mode 100644
index f16c493d..00000000
--- a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExTrace.kt
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.trace.bitbrains
-
-import org.opendc.trace.*
-import java.nio.file.Path
-
-/**
- * [Trace] implementation for the extended Bitbrains format.
- */
-public class BitbrainsExTrace internal constructor(private val path: Path) : Trace {
-    override val tables: List<String> = listOf(TABLE_RESOURCE_STATES)
-
-    override fun containsTable(name: String): Boolean = TABLE_RESOURCE_STATES == name
-
-    override fun getTable(name: String): Table? {
-        if (!containsTable(name)) {
-            return null
-        }
-
-        return BitbrainsExResourceStateTable(path)
-    }
-
-    override fun toString(): String = "BitbrainsExTrace[$path]"
-}
diff --git a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExTraceFormat.kt b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExTraceFormat.kt
index 06388a84..20222c8a 100644
--- a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExTraceFormat.kt
+++ b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsExTraceFormat.kt
@@ -22,10 +22,16 @@
 
 package org.opendc.trace.bitbrains
 
+import org.opendc.trace.*
+import org.opendc.trace.spi.TableDetails
 import org.opendc.trace.spi.TraceFormat
-import java.net.URL
-import java.nio.file.Paths
-import kotlin.io.path.exists
+import org.opendc.trace.util.CompositeTableReader
+import java.nio.file.Files
+import java.nio.file.Path
+import java.util.stream.Collectors
+import kotlin.io.path.bufferedReader
+import kotlin.io.path.extension
+import kotlin.io.path.nameWithoutExtension
 
 /**
  * A format implementation for the extended Bitbrains trace format.
@@ -36,12 +42,67 @@ public class BitbrainsExTraceFormat : TraceFormat {
      */
     override val name: String = "bitbrains-ex"
 
+    override fun create(path: Path) {
+        throw UnsupportedOperationException("Writing not supported for this format")
+    }
+
+    override fun getTables(path: Path): List<String> = listOf(TABLE_RESOURCE_STATES)
+
+    override fun getDetails(path: Path, table: String): TableDetails {
+        return when (table) {
+            TABLE_RESOURCE_STATES -> TableDetails(
+                listOf(
+                    RESOURCE_ID,
+                    RESOURCE_CLUSTER_ID,
+                    RESOURCE_STATE_TIMESTAMP,
+                    RESOURCE_CPU_COUNT,
+                    RESOURCE_CPU_CAPACITY,
+                    RESOURCE_STATE_CPU_USAGE,
+                    RESOURCE_STATE_CPU_USAGE_PCT,
+                    RESOURCE_STATE_CPU_DEMAND,
+                    RESOURCE_STATE_CPU_READY_PCT,
+                    RESOURCE_MEM_CAPACITY,
+                    RESOURCE_STATE_DISK_READ,
+                    RESOURCE_STATE_DISK_WRITE
+                ),
+                listOf(RESOURCE_ID, RESOURCE_STATE_TIMESTAMP)
+            )
+            else -> throw IllegalArgumentException("Table $table not supported")
+        }
+    }
+
+    override fun newReader(path: Path, table: String): TableReader {
+        return when (table) {
+            TABLE_RESOURCE_STATES -> newResourceStateReader(path)
+            else -> throw IllegalArgumentException("Table $table not supported")
+        }
+    }
+
+    override fun newWriter(path: Path, table: String): TableWriter {
+        throw UnsupportedOperationException("Writing not supported for this format")
+    }
+
     /**
-     * Open the trace file.
+     * Construct a [TableReader] for reading over all resource state partitions.
      */
-    override fun open(url: URL): BitbrainsExTrace {
-        val path = Paths.get(url.toURI())
-        require(path.exists()) { "URL $url does not exist" }
-        return BitbrainsExTrace(path)
+    private fun newResourceStateReader(path: Path): TableReader {
+        val partitions = Files.walk(path, 1)
+            .filter { !Files.isDirectory(it) && it.extension == "txt" }
+            .collect(Collectors.toMap({ it.nameWithoutExtension }, { it }))
+            .toSortedMap()
+        val it = partitions.iterator()
+
+        return object : CompositeTableReader() {
+            override fun nextReader(): TableReader? {
+                return if (it.hasNext()) {
+                    val (_, partPath) = it.next()
+                    return BitbrainsExResourceStateTableReader(partPath.bufferedReader())
+                } else {
+                    null
+                }
+            }
+
+            override fun toString(): String = "BitbrainsExCompositeTableReader"
+        }
     }
 }
diff --git a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceStateTable.kt b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceStateTable.kt
deleted file mode 100644
index 7241b18b..00000000
--- a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceStateTable.kt
+++ /dev/null
@@ -1,137 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.trace.bitbrains
-
-import com.fasterxml.jackson.dataformat.csv.CsvFactory
-import org.opendc.trace.*
-import java.nio.file.Files
-import java.nio.file.Path
-import java.util.stream.Collectors
-import kotlin.io.path.extension
-import kotlin.io.path.nameWithoutExtension
-
-/**
- * The resource state [Table] in the Bitbrains format.
- */
-internal class BitbrainsResourceStateTable(private val factory: CsvFactory, path: Path) : Table {
-    /**
-     * The partitions that belong to the table.
-     */
-    private val partitions =
-        Files.walk(path, 1)
-            .filter { !Files.isDirectory(it) && it.extension == "csv" }
-            .collect(Collectors.toMap({ it.nameWithoutExtension }, { it }))
-            .toSortedMap()
-
-    override val name: String = TABLE_RESOURCE_STATES
-
-    override val isSynthetic: Boolean = false
-
-    override val columns: List<TableColumn<*>> = listOf(
-        RESOURCE_STATE_ID,
-        RESOURCE_STATE_TIMESTAMP,
-        RESOURCE_STATE_CPU_COUNT,
-        RESOURCE_STATE_CPU_CAPACITY,
-        RESOURCE_STATE_CPU_USAGE,
-        RESOURCE_STATE_CPU_USAGE_PCT,
-        RESOURCE_STATE_MEM_CAPACITY,
-        RESOURCE_STATE_MEM_USAGE,
-        RESOURCE_STATE_DISK_READ,
-        RESOURCE_STATE_DISK_WRITE,
-        RESOURCE_STATE_NET_RX,
-        RESOURCE_STATE_NET_TX,
-    )
-
-    override fun newReader(): TableReader {
-        val it = partitions.iterator()
-
-        return object : TableReader {
-            var delegate: TableReader? = nextDelegate()
-
-            override fun nextRow(): Boolean {
-                var delegate = delegate
-
-                while (delegate != null) {
-                    if (delegate.nextRow()) {
-                        break
-                    }
-
-                    delegate.close()
-                    delegate = nextDelegate()
-                    this.delegate = delegate
-                }
-
-                return delegate != null
-            }
-
-            override fun hasColumn(column: TableColumn<*>): Boolean = delegate?.hasColumn(column) ?: false
-
-            override fun <T> get(column: TableColumn<T>): T {
-                val delegate = checkNotNull(delegate) { "Invalid reader state" }
-                return delegate.get(column)
-            }
-
-            override fun getBoolean(column: TableColumn<Boolean>): Boolean {
-                val delegate = checkNotNull(delegate) { "Invalid reader state" }
-                return delegate.getBoolean(column)
-            }
-
-            override fun getInt(column: TableColumn<Int>): Int {
-                val delegate = checkNotNull(delegate) { "Invalid reader state" }
-                return delegate.getInt(column)
-            }
-
-            override fun getLong(column: TableColumn<Long>): Long {
-                val delegate = checkNotNull(delegate) { "Invalid reader state" }
-                return delegate.getLong(column)
-            }
-
-            override fun getDouble(column: TableColumn<Double>): Double {
-                val delegate = checkNotNull(delegate) { "Invalid reader state" }
-                return delegate.getDouble(column)
-            }
-
-            override fun close() {
-                delegate?.close()
-            }
-
-            private fun nextDelegate(): TableReader? {
-                return if (it.hasNext()) {
-                    val (partition, path) = it.next()
-                    return BitbrainsResourceStateTableReader(partition, factory.createParser(path.toFile()))
-                } else {
-                    null
-                }
-            }
-
-            override fun toString(): String = "BitbrainsCompositeTableReader"
-        }
-    }
-
-    override fun newReader(partition: String): TableReader {
-        val path = requireNotNull(partitions[partition]) { "Invalid partition $partition" }
-        return BitbrainsResourceStateTableReader(partition, factory.createParser(path.toFile()))
-    }
-
-    override fun toString(): String = "BitbrainsResourceStateTable"
-}
diff --git a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceStateTableReader.kt b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceStateTableReader.kt
index 56e66f5c..3a8839b4 100644
--- a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceStateTableReader.kt
+++ b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceStateTableReader.kt
@@ -111,71 +111,49 @@ internal class BitbrainsResourceStateTableReader(private val partition: String,
         return true
     }
 
-    override fun hasColumn(column: TableColumn<*>): Boolean {
-        return when (column) {
-            RESOURCE_STATE_ID -> true
-            RESOURCE_STATE_TIMESTAMP -> true
-            RESOURCE_STATE_CPU_COUNT -> true
-            RESOURCE_STATE_CPU_CAPACITY -> true
-            RESOURCE_STATE_CPU_USAGE -> true
-            RESOURCE_STATE_CPU_USAGE_PCT -> true
-            RESOURCE_STATE_MEM_CAPACITY -> true
-            RESOURCE_STATE_MEM_USAGE -> true
-            RESOURCE_STATE_DISK_READ -> true
-            RESOURCE_STATE_DISK_WRITE -> true
-            RESOURCE_STATE_NET_RX -> true
-            RESOURCE_STATE_NET_TX -> true
-            else -> false
-        }
+    override fun resolve(column: TableColumn<*>): Int = columns[column] ?: -1
+
+    override fun isNull(index: Int): Boolean {
+        check(index in 0..columns.size) { "Invalid column index" }
+        return false
     }
 
-    override fun <T> get(column: TableColumn<T>): T {
-        val res: Any? = when (column) {
-            RESOURCE_STATE_ID -> partition
-            RESOURCE_STATE_TIMESTAMP -> timestamp
-            RESOURCE_STATE_CPU_COUNT -> cpuCores
-            RESOURCE_STATE_CPU_CAPACITY -> cpuCapacity
-            RESOURCE_STATE_CPU_USAGE -> cpuUsage
-            RESOURCE_STATE_CPU_USAGE_PCT -> cpuUsagePct
-            RESOURCE_STATE_MEM_CAPACITY -> memCapacity
-            RESOURCE_STATE_MEM_USAGE -> memUsage
-            RESOURCE_STATE_DISK_READ -> diskRead
-            RESOURCE_STATE_DISK_WRITE -> diskWrite
-            RESOURCE_STATE_NET_RX -> netReceived
-            RESOURCE_STATE_NET_TX -> netTransmitted
+    override fun get(index: Int): Any? {
+        return when (index) {
+            COL_ID -> partition
+            COL_TIMESTAMP -> timestamp
+            COL_CPU_COUNT -> getInt(index)
+            COL_CPU_CAPACITY, COL_CPU_USAGE, COL_CPU_USAGE_PCT, COL_MEM_CAPACITY, COL_MEM_USAGE, COL_DISK_READ, COL_DISK_WRITE, COL_NET_RX, COL_NET_TX -> getDouble(index)
             else -> throw IllegalArgumentException("Invalid column")
         }
-
-        @Suppress("UNCHECKED_CAST")
-        return res as T
     }
 
-    override fun getBoolean(column: TableColumn<Boolean>): Boolean {
+    override fun getBoolean(index: Int): Boolean {
         throw IllegalArgumentException("Invalid column")
     }
 
-    override fun getInt(column: TableColumn<Int>): Int {
-        return when (column) {
-            RESOURCE_STATE_CPU_COUNT -> cpuCores
+    override fun getInt(index: Int): Int {
+        return when (index) {
+            COL_CPU_COUNT -> cpuCores
             else -> throw IllegalArgumentException("Invalid column")
         }
     }
 
-    override fun getLong(column: TableColumn<Long>): Long {
+    override fun getLong(index: Int): Long {
         throw IllegalArgumentException("Invalid column")
     }
 
-    override fun getDouble(column: TableColumn<Double>): Double {
-        return when (column) {
-            RESOURCE_STATE_CPU_CAPACITY -> cpuCapacity
-            RESOURCE_STATE_CPU_USAGE -> cpuUsage
-            RESOURCE_STATE_CPU_USAGE_PCT -> cpuUsagePct
-            RESOURCE_STATE_MEM_CAPACITY -> memCapacity
-            RESOURCE_STATE_MEM_USAGE -> memUsage
-            RESOURCE_STATE_DISK_READ -> diskRead
-            RESOURCE_STATE_DISK_WRITE -> diskWrite
-            RESOURCE_STATE_NET_RX -> netReceived
-            RESOURCE_STATE_NET_TX -> netTransmitted
+    override fun getDouble(index: Int): Double {
+        return when (index) {
+            COL_CPU_CAPACITY -> cpuCapacity
+            COL_CPU_USAGE -> cpuUsage
+            COL_CPU_USAGE_PCT -> cpuUsagePct
+            COL_MEM_CAPACITY -> memCapacity
+            COL_MEM_USAGE -> memUsage
+            COL_DISK_READ -> diskRead
+            COL_DISK_WRITE -> diskWrite
+            COL_NET_RX -> netReceived
+            COL_NET_TX -> netTransmitted
             else -> throw IllegalArgumentException("Invalid column")
         }
     }
@@ -249,6 +227,34 @@ internal class BitbrainsResourceStateTableReader(private val partition: String,
         netTransmitted = Double.NaN
     }
 
+    private val COL_TIMESTAMP = 0
+    private val COL_CPU_COUNT = 1
+    private val COL_CPU_CAPACITY = 2
+    private val COL_CPU_USAGE = 3
+    private val COL_CPU_USAGE_PCT = 4
+    private val COL_MEM_CAPACITY = 5
+    private val COL_MEM_USAGE = 6
+    private val COL_DISK_READ = 7
+    private val COL_DISK_WRITE = 8
+    private val COL_NET_RX = 9
+    private val COL_NET_TX = 10
+    private val COL_ID = 11
+
+    private val columns = mapOf(
+        RESOURCE_ID to COL_ID,
+        RESOURCE_STATE_TIMESTAMP to COL_TIMESTAMP,
+        RESOURCE_CPU_COUNT to COL_CPU_COUNT,
+        RESOURCE_CPU_CAPACITY to COL_CPU_CAPACITY,
+        RESOURCE_STATE_CPU_USAGE to COL_CPU_USAGE,
+        RESOURCE_STATE_CPU_USAGE_PCT to COL_CPU_USAGE_PCT,
+        RESOURCE_MEM_CAPACITY to COL_MEM_CAPACITY,
+        RESOURCE_STATE_MEM_USAGE to COL_MEM_USAGE,
+        RESOURCE_STATE_DISK_READ to COL_DISK_READ,
+        RESOURCE_STATE_DISK_WRITE to COL_DISK_WRITE,
+        RESOURCE_STATE_NET_RX to COL_NET_RX,
+        RESOURCE_STATE_NET_TX to COL_NET_TX
+    )
+
     /**
      * The type of the timestamp in the trace.
      */
diff --git a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceTable.kt b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceTable.kt
deleted file mode 100644
index bc4f0b7d..00000000
--- a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceTable.kt
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.trace.bitbrains
-
-import com.fasterxml.jackson.dataformat.csv.CsvFactory
-import org.opendc.trace.*
-import java.nio.file.Files
-import java.nio.file.Path
-import java.util.stream.Collectors
-import kotlin.io.path.extension
-import kotlin.io.path.nameWithoutExtension
-
-/**
- * The resources [Table] in the Bitbrains format.
- */
-internal class BitbrainsResourceTable(private val factory: CsvFactory, path: Path) : Table {
-    /**
-     * The VMs that belong to the table.
-     */
-    private val vms =
-        Files.walk(path, 1)
-            .filter { !Files.isDirectory(it) && it.extension == "csv" }
-            .collect(Collectors.toMap({ it.nameWithoutExtension }, { it }))
-            .toSortedMap()
-
-    override val name: String = TABLE_RESOURCES
-
-    override val isSynthetic: Boolean = true
-
-    override val columns: List<TableColumn<*>> = listOf(RESOURCE_ID)
-
-    override fun newReader(): TableReader {
-        return BitbrainsResourceTableReader(factory, vms)
-    }
-
-    override fun newReader(partition: String): TableReader {
-        throw IllegalArgumentException("Unknown partition $partition")
-    }
-
-    override fun toString(): String = "BitbrainsResourceTable"
-}
diff --git a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceTableReader.kt b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceTableReader.kt
index c02dc5ae..3701994a 100644
--- a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceTableReader.kt
+++ b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsResourceTableReader.kt
@@ -43,13 +43,14 @@ internal class BitbrainsResourceTableReader(private val factory: CsvFactory, vms
 
             val parser = factory.createParser(path.toFile())
             val reader = BitbrainsResourceStateTableReader(name, parser)
+            val idCol = reader.resolve(RESOURCE_ID)
 
             try {
                 if (!reader.nextRow()) {
                     continue
                 }
 
-                id = reader.get(RESOURCE_STATE_ID)
+                id = reader.get(idCol) as String
                 return true
             } finally {
                 reader.close()
@@ -59,36 +60,33 @@ internal class BitbrainsResourceTableReader(private val factory: CsvFactory, vms
         return false
     }
 
-    override fun hasColumn(column: TableColumn<*>): Boolean {
-        return when (column) {
-            RESOURCE_ID -> true
-            else -> false
-        }
+    override fun resolve(column: TableColumn<*>): Int = columns[column] ?: -1
+
+    override fun isNull(index: Int): Boolean {
+        check(index in 0..columns.size) { "Invalid column index" }
+        return false
     }
 
-    override fun <T> get(column: TableColumn<T>): T {
-        val res: Any? = when (column) {
-            RESOURCE_ID -> id
+    override fun get(index: Int): Any? {
+        return when (index) {
+            COL_ID -> id
             else -> throw IllegalArgumentException("Invalid column")
         }
-
-        @Suppress("UNCHECKED_CAST")
-        return res as T
     }
 
-    override fun getBoolean(column: TableColumn<Boolean>): Boolean {
+    override fun getBoolean(index: Int): Boolean {
         throw IllegalArgumentException("Invalid column")
     }
 
-    override fun getInt(column: TableColumn<Int>): Int {
+    override fun getInt(index: Int): Int {
         throw IllegalArgumentException("Invalid column")
     }
 
-    override fun getLong(column: TableColumn<Long>): Long {
+    override fun getLong(index: Int): Long {
         throw IllegalArgumentException("Invalid column")
     }
 
-    override fun getDouble(column: TableColumn<Double>): Double {
+    override fun getDouble(index: Int): Double {
         throw IllegalArgumentException("Invalid column")
     }
 
@@ -105,4 +103,7 @@ internal class BitbrainsResourceTableReader(private val factory: CsvFactory, vms
     private fun reset() {
         id = null
     }
+
+    private val COL_ID = 0
+    private val columns = mapOf(RESOURCE_ID to COL_ID)
 }
diff --git a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsTrace.kt b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsTrace.kt
deleted file mode 100644
index bcd8dd52..00000000
--- a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsTrace.kt
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
- * Copyright (c) 2021 AtLarge Research
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package org.opendc.trace.bitbrains
-
-import com.fasterxml.jackson.dataformat.csv.CsvFactory
-import org.opendc.trace.*
-import java.nio.file.Path
-
-/**
- * [Trace] implementation for the Bitbrains format.
- */
-public class BitbrainsTrace internal constructor(private val factory: CsvFactory, private val path: Path) : Trace {
-    override val tables: List<String> = listOf(TABLE_RESOURCES, TABLE_RESOURCE_STATES)
-
-    override fun containsTable(name: String): Boolean = tables.contains(name)
-
-    override fun getTable(name: String): Table? {
-        return when (name) {
-            TABLE_RESOURCES -> BitbrainsResourceTable(factory, path)
-            TABLE_RESOURCE_STATES -> BitbrainsResourceStateTable(factory, path)
-            else -> null
-        }
-    }
-
-    override fun toString(): String = "BitbrainsTrace[$path]"
-}
diff --git a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsTraceFormat.kt b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsTraceFormat.kt
index 55b11fe3..3885c931 100644
--- a/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsTraceFormat.kt
+++ b/opendc-trace/opendc-trace-bitbrains/src/main/kotlin/org/opendc/trace/bitbrains/BitbrainsTraceFormat.kt
@@ -24,10 +24,15 @@ package org.opendc.trace.bitbrains
 
 import com.fasterxml.jackson.dataformat.csv.CsvFactory
 import com.fasterxml.jackson.dataformat.csv.CsvParser
+import org.opendc.trace.*
+import org.opendc.trace.spi.TableDetails
 import org.opendc.trace.spi.TraceFormat
-import java.net.URL
-import java.nio.file.Paths
-import kotlin.io.path.exists
+import org.opendc.trace.util.CompositeTableReader
+import java.nio.file.Files
+import java.nio.file.Path
+import java.util.stream.Collectors
+import kotlin.io.path.extension
+import kotlin.io.path.nameWithoutExtension
 
 /**
  * A format implementation for the GWF trace format.
@@ -45,12 +50,75 @@ public class BitbrainsTraceFormat : TraceFormat {
         .enable(CsvParser.Feature.ALLOW_COMMENTS)
         .enable(CsvParser.Feature.TRIM_SPACES)
 
+    override fun create(path: Path) {
+        throw UnsupportedOperationException("Writing not supported for this format")
+    }
+
+    override fun getTables(path: Path): List<String> = listOf(TABLE_RESOURCES, TABLE_RESOURCE_STATES)
+
+    override fun getDetails(path: Path, table: String): TableDetails {
+        return when (table) {
+            TABLE_RESOURCES -> TableDetails(listOf(RESOURCE_ID))
+            TABLE_RESOURCE_STATES -> TableDetails(
+                listOf(
+                    RESOURCE_ID,
+                    RESOURCE_STATE_TIMESTAMP,
+                    RESOURCE_CPU_COUNT,
+                    RESOURCE_CPU_CAPACITY,
+                    RESOURCE_STATE_CPU_USAGE,
+                    RESOURCE_STATE_CPU_USAGE_PCT,
+                    RESOURCE_MEM_CAPACITY,
+                    RESOURCE_STATE_MEM_USAGE,
+                    RESOURCE_STATE_DISK_READ,
+                    RESOURCE_STATE_DISK_WRITE,
+                    RESOURCE_STATE_NET_RX,
+                    RESOURCE_STATE_NET_TX,
+                ),
+                listOf(RESOURCE_ID, RESOURCE_STATE_TIMESTAMP)
+            )
+            else -> throw IllegalArgumentException("Table $table not supported")
+        }
+    }
+
+    override fun newReader(path: Path, table: String): TableReader {
+        return when (table) {
+            TABLE_RESOURCES -> {
+                val vms = Files.walk(path, 1)
+                    .filter { !Files.isDirectory(it) && it.extension == "csv" }
+                    .collect(Collectors.toMap({ it.nameWithoutExtension }, { it }))
+                    .toSortedMap()
+                BitbrainsResourceTableReader(factory, vms)
+            }
+            TABLE_RESOURCE_STATES -> newResourceStateReader(path)
+            else -> throw IllegalArgumentException("Table $table not supported")
+        }
+    }
+
+    override fun newWriter(path: Path, table: String): TableWriter {
+        throw UnsupportedOperationException("Writing not supported for this format")
+    }
+
     /**
-     * Open a Bitbrains trace.
+     * Construct a [TableReader] for reading over all resource state partitions.
      */
-    override fun open(url: URL): BitbrainsTrace {
-        val path = Paths.get(url.toURI())
-        require(path.exists()) { "URL $url does not exist" }
-        return BitbrainsTrace(factory, path)
+    private fun newResourceStateReader(path: Path): TableReader {
+        val partitions = Files.walk(path, 1)
+            .filter { !Files.isDirectory(it) && it.extension == "csv" }
+            .collect(Collectors.toMap({ it.nameWithoutExtension }, { it }))
+            .toSortedMap()
+        val it = partitions.iterator()
+
+        return object : CompositeTableReader() {
+            override fun nextReader(): TableReader? {
+                return if (it.hasNext()) {
+                    val (partition, partPath) = it.next()
+                    return BitbrainsResourceStateTableReader(partition, factory.createParser(partPath.toFile()))
+                } else {
+                    null
+                }
+            }
+
+            override fun toString(): String = "BitbrainsCompositeTableReader"
+        }
     }
 }
diff --git a/opendc-trace/opendc-trace-bitbrains/src/test/kotlin/org/opendc/trace/bitbrains/BitbrainsExTraceFormatTest.kt b/opendc-trace/opendc-trace-bitbrains/src/test/kotlin/org/opendc/trace/bitbrains/BitbrainsExTraceFormatTest.kt
index 2e4f176a..d734cf5f 100644
--- a/opendc-trace/opendc-trace-bitbrains/src/test/kotlin/org/opendc/trace/bitbrains/BitbrainsExTraceFormatTest.kt
+++ b/opendc-trace/opendc-trace-bitbrains/src/test/kotlin/org/opendc/trace/bitbrains/BitbrainsExTraceFormatTest.kt
@@ -26,62 +26,38 @@ import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertThrows
 import org.opendc.trace.*
-import java.net.URL
+import java.nio.file.Paths
 
 /**
  * Test suite for the [BitbrainsExTraceFormat] class.
  */
-class BitbrainsExTraceFormatTest {
+internal class BitbrainsExTraceFormatTest {
     private val format = BitbrainsExTraceFormat()
 
     @Test
-    fun testTraceExists() {
-        val url = checkNotNull(BitbrainsExTraceFormatTest::class.java.getResource("/vm.txt"))
-        assertDoesNotThrow {
-            format.open(url)
-        }
-    }
-
-    @Test
-    fun testTraceDoesNotExists() {
-        val url = checkNotNull(BitbrainsExTraceFormatTest::class.java.getResource("/vm.txt"))
-        assertThrows<IllegalArgumentException> {
-            format.open(URL(url.toString() + "help"))
-        }
-    }
-
-    @Test
     fun testTables() {
-        val url = checkNotNull(BitbrainsExTraceFormatTest::class.java.getResource("/vm.txt"))
-        val trace = format.open(url)
+        val path = Paths.get("src/test/resources/vm.txt")
 
-        assertEquals(listOf(TABLE_RESOURCE_STATES), trace.tables)
+        assertEquals(listOf(TABLE_RESOURCE_STATES), format.getTables(path))
     }
 
     @Test
     fun testTableExists() {
-        val url = checkNotNull(BitbrainsExTraceFormatTest::class.java.getResource("/vm.txt"))
-        val table = format.open(url).getTable(TABLE_RESOURCE_STATES)
+        val path = Paths.get("src/test/resources/vm.txt")
 
-        assertNotNull(table)
-        assertDoesNotThrow { table!!.newReader() }
+        assertDoesNotThrow { format.getDetails(path, TABLE_RESOURCE_STATES) }
     }
 
     @Test
     fun testTableDoesNotExist() {
-        val url = checkNotNull(BitbrainsExTraceFormatTest::class.java.getResource("/vm.txt"))
-        val trace = format.open(url)
-
-        assertFalse(trace.containsTable("test"))
-        assertNull(trace.getTable("test"))
+        val path = Paths.get("src/test/resources/vm.txt")
+        assertThrows<IllegalArgumentException> { format.getDetails(path, "test") }
     }
 
     @Test
     fun testSmoke() {
-        val url = checkNotNull(BitbrainsExTraceFormatTest::class.java.getResource("/vm.txt"))
-        val trace = format.open(url)
-
-        val reader = trace.getTable(TABLE_RESOURCE_STATES)!!.newReader()
+        val path = Paths.get("src/test/resources/vm.txt")
+        val reader = format.newReader(path, TABLE_RESOURCE_STATES)
 
         assertAll(
             { assertTrue(reader.nextRow()) },
diff --git a/opendc-trace/opendc-trace-bitbrains/src/test/kotlin/org/opendc/trace/bitbrains/BitbrainsTraceFormatTest.kt b/opendc-trace/opendc-trace-bitbrains/src/test/kotlin/org/opendc/trace/bitbrains/BitbrainsTraceFormatTest.kt
index ff4a33f8..41e7def2 100644
--- a/opendc-trace/opendc-trace-bitbrains/src/test/kotlin/org/opendc/trace/bitbrains/BitbrainsTraceFormatTest.kt
+++ b/opendc-trace/opendc-trace-bitbrains/src/test/kotlin/org/opendc/trace/bitbrains/BitbrainsTraceFormatTest.kt
@@ -26,66 +26,38 @@ import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertThrows
 import org.opendc.trace.*
-import java.net.URL
+import java.nio.file.Paths
 
 /**
  * Test suite for the [BitbrainsTraceFormat] class.
  */
 class BitbrainsTraceFormatTest {
-    @Test
-    fun testTraceExists() {
-        val format = BitbrainsTraceFormat()
-        val url = checkNotNull(BitbrainsTraceFormatTest::class.java.getResource("/bitbrains.csv"))
-        assertDoesNotThrow {
-            format.open(url)
-        }
-    }
-
-    @Test
-    fun testTraceDoesNotExists() {
-        val format = BitbrainsTraceFormat()
-        val url = checkNotNull(BitbrainsTraceFormatTest::class.java.getResource("/bitbrains.csv"))
-        assertThrows<IllegalArgumentException> {
-            format.open(URL(url.toString() + "help"))
-        }
-    }
+    private val format = BitbrainsTraceFormat()
 
     @Test
     fun testTables() {
-        val format = BitbrainsTraceFormat()
-        val url = checkNotNull(BitbrainsTraceFormatTest::class.java.getResource("/bitbrains.csv"))
-        val trace = format.open(url)
+        val path = Paths.get("src/test/resources/bitbrains.csv")
 
-        assertEquals(listOf(TABLE_RESOURCES, TABLE_RESOURCE_STATES), trace.tables)
+        assertEquals(listOf(TABLE_RESOURCES, TABLE_RESOURCE_STATES), format.getTables(path))
     }
 
     @Test
     fun testTableExists() {
-        val format = BitbrainsTraceFormat()
-        val url = checkNotNull(BitbrainsTraceFormatTest::class.java.getResource("/bitbrains.csv"))
-        val table = format.open(url).getTable(TABLE_RESOURCE_STATES)
+        val path = Paths.get("src/test/resources/bitbrains.csv")
 
-        assertNotNull(table)
-        assertDoesNotThrow { table!!.newReader() }
+        assertDoesNotThrow { format.getDetails(path, TABLE_RESOURCE_STATES) }
     }
 
     @Test
     fun testTableDoesNotExist() {
-        val format = BitbrainsTraceFormat()
-        val url = checkNotNull(BitbrainsTraceFormatTest::class.java.getResource("/bitbrains.csv"))
-        val trace = format.open(url)
-
-        assertFalse(trace.containsTable("test"))
-        assertNull(trace.getTable("test"))
+        val path = Paths.get("src/test/resources/bitbrains.csv")
+        assertThrows<IllegalArgumentException> { format.getDetails(path, "test") }
     }
 
     @Test
     fun testResources() {
-        val format = BitbrainsTraceFormat()
-        val url = checkNotNull(BitbrainsTraceFormatTest::class.java.getResource("/bitbrains.csv"))
-        val trace = format.open(url)
-
-        val reader = trace.getTable(TABLE_RESOURCES)!!.newReader()
+        val path = Paths.get("src/test/resources/bitbrains.csv")
+        val reader = format.newReader(path, TABLE_RESOURCES)
 
         assertAll(
             { assertTrue(reader.nextRow()) },
@@ -98,11 +70,8 @@ class BitbrainsTraceFormatTest {
 
     @Test
     fun testSmoke() {
-        val format = BitbrainsTraceFormat()
-        val url = checkNotNull(BitbrainsTraceFormatTest::class.java.getResource("/bitbrains.csv"))
-        val trace = format.open(url)
-
-        val reader = trace.getTable(TABLE_RESOURCE_STATES)!!.newReader()
+        val path = Paths.get("src/test/resources/bitbrains.csv")
+        val reader = format.newReader(path, TABLE_RESOURCE_STATES)
 
         assertAll(
             { assertTrue(reader.nextRow()) },