workers: Use workers by default for Javac.

RELNOTES: Persistent workers are now used by default for Java compilation in Bazel, which should speed up your Java builds by ~4x. You can switch back to the old behavior via --strategy=Javac=standalone. Check out http://www.bazel.io/blog/2015/12/10/java-workers.html for more details.

--
MOS_MIGRATED_REVID=128801059

1 files changed, 3 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRulesModule.java b/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRulesModule.java
index c4e9b7a780..4cf042b782 100644
--- a/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRulesModule.java
+++ b/src/main/java/com/google/devtools/build/lib/bazel/rules/BazelRulesModule.java
@@ -46,7 +46,6 @@ import com.google.devtools.build.lib.util.ResourceFileLoader;
 import com.google.devtools.common.options.Converters.AssignmentConverter;
 import com.google.devtools.common.options.Option;
 import com.google.devtools.common.options.OptionsBase;
-
 import java.io.IOException;
 import java.util.List;
 import java.util.Map;
@@ -107,6 +106,9 @@ public class BazelRulesModule extends BlazeModule {
     public ImmutableMap<String, String> getSpawnActionContexts() {
       Map<String, String> contexts = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
 
+      // Default strategies for certain mnemonics - they can be overridden by --strategy= flags.
+      contexts.put("Javac", "worker");
+
       contexts.put("Genrule", options.genruleStrategy);
 
       for (Map.Entry<String, String> strategy : options.strategy) {