Initial code for Persistent Java Test Runner.

At this point this does nothing more than re-run the exact same test without having to re-start the test runner.

In future iterations the aim is to be able to re-run tests with modified code, without having to re-start the test runner.

To test out the WorkerTestStrategy simply use --test_strategy=experimental_worker for a test with bazel.

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PiperOrigin-RevId: 141465929
MOS_MIGRATED_REVID=141465929

1 files changed, 41 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/worker/WorkerFilesHash.java b/src/main/java/com/google/devtools/build/lib/worker/WorkerFilesHash.java
new file mode 100644
index 0000000000..08ab7f5e88
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/worker/WorkerFilesHash.java
@@ -0,0 +1,41 @@
+// Copyright 2016 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.devtools.build.lib.worker;
+
+import com.google.common.hash.HashCode;
+import com.google.common.hash.Hasher;
+import com.google.common.hash.Hashing;
+import com.google.devtools.build.lib.actions.ActionExecutionContext;
+import com.google.devtools.build.lib.actions.ActionInput;
+import java.io.IOException;
+import java.nio.charset.Charset;
+
+/**
+ * Calculates the hash based on the files, which should be unchanged on disk for a worker to get
+ * reused.
+ */
+public class WorkerFilesHash {
+
+  public static HashCode getWorkerFilesHash(
+      Iterable<? extends ActionInput> toolFiles, ActionExecutionContext actionExecutionContext)
+      throws IOException {
+    Hasher hasher = Hashing.sha256().newHasher();
+    for (ActionInput tool : toolFiles) {
+      hasher.putString(tool.getExecPathString(), Charset.defaultCharset());
+      hasher.putBytes(actionExecutionContext.getActionInputFileCache().getDigest(tool));
+    }
+    return hasher.hash();
+  }
+}