merge: Add generic trace reading library

This pull request adds a generic trace reading library to OpenDC. 
The library has been designed to support a wide range of trace formats 
and uses a streaming approach to improve performance of reading large traces.

* Add trace reading API
* Implement API for GWF format
* Implement API for SWF format
* Implement API for WTF format
* Implement API for Bitbrains format
* Implement API for Bitbrains Parquet format

**Breaking API Changes**

* `opendc-format` has been removed in favour of `opendc-trace-*`

1 files changed, 70 insertions, 0 deletions

diff --git a/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/TableReader.kt b/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/TableReader.kt
new file mode 100644
index 00000000..b5e7669f
--- /dev/null
+++ b/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/TableReader.kt
@@ -0,0 +1,70 @@
+/*
+ * 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
+
+/**
+ * Base class for reading entities from a workload trace table in streaming fashion.
+ */
+public interface TableReader : AutoCloseable {
+    /**
+     * Advance the stream until the next row is reached.
+     *
+     * @return `true` if the row is valid, `false` if there are no more rows.
+     */
+    public fun nextRow(): Boolean
+
+    /**
+     * Determine whether the [TableReader] supports the specified [column].
+     */
+    public fun hasColumn(column: TableColumn<*>): Boolean
+
+    /**
+     * Obtain the value of the current column with type [T].
+     */
+    public fun <T> get(column: TableColumn<T>): T
+
+    /**
+     * Read the specified [column] as boolean.
+     */
+    public fun getBoolean(column: TableColumn<Boolean>): Boolean
+
+    /**
+     * Read the specified [column] as integer.
+     */
+    public fun getInt(column: TableColumn<Int>): Int
+
+    /**
+     * Read the specified [column] as long.
+     */
+    public fun getLong(column: TableColumn<Long>): Long
+
+    /**
+     * Read the specified [column] as double.
+     */
+    public fun getDouble(column: TableColumn<Double>): Double
+
+    /**
+     * Closes the reader so that no further iteration or data access can be made.
+     */
+    public override fun close()
+}