refactor(trace): Simplify TraceFormat SPI interface

This change simplifies the TraceFormat SPI interface by reducing the
number of interfaces that implementors need to implement to only
TraceFormat.

4 files changed, 46 insertions, 164 deletions

diff --git a/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTaskTable.kt b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTaskTable.kt
deleted file mode 100644
index 410bb347..00000000
--- a/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTaskTable.kt
+++ /dev/null
@@ -1,63 +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.wtf
-
-import org.apache.avro.generic.GenericRecord
-import org.opendc.trace.*
-import org.opendc.trace.util.parquet.LocalParquetReader
-import java.nio.file.Path
-
-/**
- * A [Table] containing the tasks in a GWF trace.
- */
-internal class WtfTaskTable(private val path: Path) : Table {
-    override val name: String = TABLE_TASKS
-
-    override val isSynthetic: Boolean = false
-
-    override val columns: List<TableColumn<*>> = listOf(
-        TASK_ID,
-        TASK_WORKFLOW_ID,
-        TASK_SUBMIT_TIME,
-        TASK_WAIT_TIME,
-        TASK_RUNTIME,
-        TASK_REQ_NCPUS,
-        TASK_PARENTS,
-        TASK_CHILDREN,
-        TASK_GROUP_ID,
-        TASK_USER_ID
-    )
-
-    override val partitionKeys: List<TableColumn<*>> = listOf(TASK_SUBMIT_TIME)
-
-    override fun newReader(): TableReader {
-        val reader = LocalParquetReader<GenericRecord>(path.resolve("tasks/schema-1.0"))
-        return WtfTaskTableReader(reader)
-    }
-
-    override fun newReader(partition: String): TableReader {
-        throw IllegalArgumentException("Invalid partition $partition")
-    }
-
-    override fun toString(): String = "WtfTaskTable"
-}
diff --git a/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTrace.kt b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTrace.kt
deleted file mode 100644
index a755a107..00000000
--- a/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTrace.kt
+++ /dev/null
@@ -1,47 +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.wtf
-
-import org.opendc.trace.TABLE_TASKS
-import org.opendc.trace.Table
-import org.opendc.trace.Trace
-import java.nio.file.Path
-
-/**
- * [Trace] implementation for the WTF format.
- */
-public class WtfTrace internal constructor(private val path: Path) : Trace {
-    override val tables: List<String> = listOf(TABLE_TASKS)
-
-    override fun containsTable(name: String): Boolean = TABLE_TASKS == name
-
-    override fun getTable(name: String): Table? {
-        if (!containsTable(name)) {
-            return null
-        }
-
-        return WtfTaskTable(path)
-    }
-
-    override fun toString(): String = "WtfTrace[$path]"
-}
diff --git a/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTraceFormat.kt b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTraceFormat.kt
index 781cb335..2f17694f 100644
--- a/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTraceFormat.kt
+++ b/opendc-trace/opendc-trace-wtf/src/main/kotlin/org/opendc/trace/wtf/WtfTraceFormat.kt
@@ -22,10 +22,12 @@
 
 package org.opendc.trace.wtf
 
+import org.apache.avro.generic.GenericRecord
+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.parquet.LocalParquetReader
+import java.nio.file.Path
 
 /**
  * A [TraceFormat] implementation for the Workflow Trace Format (WTF).
@@ -33,9 +35,36 @@ import kotlin.io.path.exists
 public class WtfTraceFormat : TraceFormat {
     override val name: String = "wtf"
 
-    override fun open(url: URL): WtfTrace {
-        val path = Paths.get(url.toURI())
-        require(path.exists()) { "URL $url does not exist" }
-        return WtfTrace(path)
+    override fun getTables(path: Path): List<String> = listOf(TABLE_TASKS)
+
+    override fun getDetails(path: Path, table: String): TableDetails {
+        return when (table) {
+            TABLE_TASKS -> TableDetails(
+                listOf(
+                    TASK_ID,
+                    TASK_WORKFLOW_ID,
+                    TASK_SUBMIT_TIME,
+                    TASK_WAIT_TIME,
+                    TASK_RUNTIME,
+                    TASK_REQ_NCPUS,
+                    TASK_PARENTS,
+                    TASK_CHILDREN,
+                    TASK_GROUP_ID,
+                    TASK_USER_ID
+                ),
+                listOf(TASK_SUBMIT_TIME)
+            )
+            else -> throw IllegalArgumentException("Table $table not supported")
+        }
+    }
+
+    override fun newReader(path: Path, table: String): TableReader {
+        return when (table) {
+            TABLE_TASKS -> {
+                val reader = LocalParquetReader<GenericRecord>(path.resolve("tasks/schema-1.0"))
+                WtfTaskTableReader(reader)
+            }
+            else -> throw IllegalArgumentException("Table $table not supported")
+        }
     }
 }
diff --git a/opendc-trace/opendc-trace-wtf/src/test/kotlin/org/opendc/trace/wtf/WtfTraceFormatTest.kt b/opendc-trace/opendc-trace-wtf/src/test/kotlin/org/opendc/trace/wtf/WtfTraceFormatTest.kt
index b155f265..09c3703a 100644
--- a/opendc-trace/opendc-trace-wtf/src/test/kotlin/org/opendc/trace/wtf/WtfTraceFormatTest.kt
+++ b/opendc-trace/opendc-trace-wtf/src/test/kotlin/org/opendc/trace/wtf/WtfTraceFormatTest.kt
@@ -26,8 +26,7 @@ import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertThrows
 import org.opendc.trace.*
-import java.io.File
-import java.net.URL
+import java.nio.file.Paths
 import java.time.Duration
 import java.time.Instant
 
@@ -35,51 +34,25 @@ import java.time.Instant
  * Test suite for the [WtfTraceFormat] class.
  */
 class WtfTraceFormatTest {
-    @Test
-    fun testTraceExists() {
-        val input = File("src/test/resources/wtf-trace").toURI().toURL()
-        val format = WtfTraceFormat()
-        org.junit.jupiter.api.assertDoesNotThrow {
-            format.open(input)
-        }
-    }
-
-    @Test
-    fun testTraceDoesNotExists() {
-        val input = File("src/test/resources/wtf-trace").toURI().toURL()
-        val format = WtfTraceFormat()
-        assertThrows<IllegalArgumentException> {
-            format.open(URL(input.toString() + "help"))
-        }
-    }
+    private val format = WtfTraceFormat()
 
     @Test
     fun testTables() {
-        val input = File("src/test/resources/wtf-trace").toURI().toURL()
-        val format = WtfTraceFormat()
-        val trace = format.open(input)
-
-        assertEquals(listOf(TABLE_TASKS), trace.tables)
+        val path = Paths.get("src/test/resources/wtf-trace")
+        assertEquals(listOf(TABLE_TASKS), format.getTables(path))
     }
 
     @Test
     fun testTableExists() {
-        val input = File("src/test/resources/wtf-trace").toURI().toURL()
-        val format = WtfTraceFormat()
-        val table = format.open(input).getTable(TABLE_TASKS)
-
-        assertNotNull(table)
-        org.junit.jupiter.api.assertDoesNotThrow { table!!.newReader() }
+        val path = Paths.get("src/test/resources/wtf-trace")
+        assertDoesNotThrow { format.getDetails(path, TABLE_TASKS) }
     }
 
     @Test
     fun testTableDoesNotExist() {
-        val input = File("src/test/resources/wtf-trace").toURI().toURL()
-        val format = WtfTraceFormat()
-        val trace = format.open(input)
+        val path = Paths.get("src/test/resources/wtf-trace")
 
-        assertFalse(trace.containsTable("test"))
-        assertNull(trace.getTable("test"))
+        assertThrows<IllegalArgumentException> { format.getDetails(path, "test") }
     }
 
     /**
@@ -87,9 +60,8 @@ class WtfTraceFormatTest {
      */
     @Test
     fun testTableReader() {
-        val input = File("src/test/resources/wtf-trace")
-        val trace = WtfTraceFormat().open(input.toURI().toURL())
-        val reader = trace.getTable(TABLE_TASKS)!!.newReader()
+        val path = Paths.get("src/test/resources/wtf-trace")
+        val reader = format.newReader(path, TABLE_TASKS)
 
         assertAll(
             { assertTrue(reader.nextRow()) },
@@ -111,13 +83,4 @@ class WtfTraceFormatTest {
 
         reader.close()
     }
-
-    @Test
-    fun testTableReaderPartition() {
-        val input = File("src/test/resources/wtf-trace").toURI().toURL()
-        val format = WtfTraceFormat()
-        val table = format.open(input).getTable(TABLE_TASKS)!!
-
-        assertThrows<IllegalArgumentException> { table.newReader("test") }
-    }
 }