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, 62 insertions, 0 deletions

diff --git a/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/spi/TraceFormat.kt b/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/spi/TraceFormat.kt
new file mode 100644
index 00000000..54029fcf
--- /dev/null
+++ b/opendc-trace/opendc-trace-api/src/main/kotlin/org/opendc/trace/spi/TraceFormat.kt
@@ -0,0 +1,62 @@
+/*
+ * 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.spi
+
+import org.opendc.trace.Trace
+import java.net.URL
+import java.util.*
+
+/**
+ * A service-provider class for parsing trace formats.
+ */
+public interface TraceFormat {
+    /**
+     * The name of the trace format.
+     */
+    public val name: String
+
+    /**
+     * Open a new [Trace] with this provider.
+     *
+     * @param url A reference to the trace.
+     */
+    public fun open(url: URL): Trace
+
+    /**
+     * A helper object for resolving providers.
+     */
+    public companion object {
+        /**
+         * A list of [TraceFormat] that are available on this system.
+         */
+        public val installedProviders: List<TraceFormat> by lazy {
+            val loader = ServiceLoader.load(TraceFormat::class.java)
+            loader.toList()
+        }
+
+        /**
+         * Obtain a [TraceFormat] implementation by [name].
+         */
+        public fun byName(name: String): TraceFormat? = installedProviders.find { it.name == name }
+    }
+}