merge: Enable re-use of virtual machine workload helpers

This pull request enables re-use of virtual machine workload helpers by extracting the helpers into a 
separate module which may be used by other experiments.

- Support workload/machine CPU count mismatch
- Extract common code out of Capelin experiments
- Support flexible topology creation
- Add option for optimizing SimHost simulation
- Support creating CPU-optimized topology
- Make workload sampling model extensible
- Add support for extended Bitbrains trace format 
- Add support for Azure VM trace format
- Add support for internal OpenDC VM trace format
- Optimize OpenDC VM trace format
- Add tool for converting workload traces
- Remove dependency on SnakeYaml 

**Breaking API Changes**

-   `RESOURCE_NCPU` and `RESOURCE_STATE_NCPU` are renamed to `RESOURCE_CPU_COUNT` and `RESOURCE_STATE_CPU_COUNT` respectively.

1 files changed, 44 insertions, 0 deletions

diff --git a/opendc-trace/opendc-trace-parquet/src/main/kotlin/org/opendc/trace/util/parquet/AvroUtils.kt b/opendc-trace/opendc-trace-parquet/src/main/kotlin/org/opendc/trace/util/parquet/AvroUtils.kt
new file mode 100644
index 00000000..086b900b
--- /dev/null
+++ b/opendc-trace/opendc-trace-parquet/src/main/kotlin/org/opendc/trace/util/parquet/AvroUtils.kt
@@ -0,0 +1,44 @@
+/*
+ * 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.
+ */
+
+@file:JvmName("AvroUtils")
+package org.opendc.trace.util.parquet
+
+import org.apache.avro.LogicalTypes
+import org.apache.avro.Schema
+
+/**
+ * Schema for UUID type.
+ */
+public val UUID_SCHEMA: Schema = LogicalTypes.uuid().addToSchema(Schema.create(Schema.Type.STRING))
+
+/**
+ * Schema for timestamp type.
+ */
+public val TIMESTAMP_SCHEMA: Schema = LogicalTypes.timestampMillis().addToSchema(Schema.create(Schema.Type.LONG))
+
+/**
+ * Helper function to make a [Schema] field optional.
+ */
+public fun Schema.optional(): Schema {
+    return Schema.createUnion(Schema.create(Schema.Type.NULL), this)
+}