1 files changed, 100 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/config/SysExecutorModule.java b/java/com/google/gerrit/server/config/SysExecutorModule.java
new file mode 100644
index 0000000000..f552434395
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+++ b/java/com/google/gerrit/server/config/SysExecutorModule.java
@@ -0,0 +1,100 @@
+// Copyright (C) 2012 The Android Open Source Project
+//
+// 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.gerrit.server.config;
+
+import com.google.common.util.concurrent.ListeningExecutorService;
+import com.google.common.util.concurrent.MoreExecutors;
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+import com.google.gerrit.server.FanOutExecutor;
+import com.google.gerrit.server.git.WorkQueue;
+import com.google.gerrit.server.logging.LoggingContextAwareExecutorService;
+import com.google.inject.AbstractModule;
+import com.google.inject.Provides;
+import com.google.inject.Singleton;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import org.eclipse.jgit.lib.Config;
+
+/**
+ * Module providing the {@link ReceiveCommitsExecutor}.
+ *
+ * <p>This module is intended to be installed at the top level when creating a {@code sysInjector}
+ * in {@code Daemon} or similar, not nested in another module. This ensures the module can be
+ * swapped out for the googlesource.com implementation.
+ */
+public class SysExecutorModule extends AbstractModule {
+  @Override
+  protected void configure() {}
+
+  @Provides
+  @Singleton
+  @ReceiveCommitsExecutor
+  public ExecutorService createReceiveCommitsExecutor(
+      @GerritServerConfig Config config, WorkQueue queues) {
+    int poolSize =
+        config.getInt(
+            "receive", null, "threadPoolSize", Runtime.getRuntime().availableProcessors());
+    return queues.createQueue(poolSize, "ReceiveCommits", true);
+  }
+
+  @Provides
+  @Singleton
+  @SendEmailExecutor
+  public ExecutorService createSendEmailExecutor(
+      @GerritServerConfig Config config, WorkQueue queues) {
+    int poolSize = config.getInt("sendemail", null, "threadPoolSize", 1);
+    if (poolSize == 0) {
+      return MoreExecutors.newDirectExecutorService();
+    }
+    return queues.createQueue(poolSize, "SendEmail", true);
+  }
+
+  @Provides
+  @Singleton
+  @FanOutExecutor
+  public ExecutorService createFanOutExecutor(@GerritServerConfig Config config, WorkQueue queues) {
+    int poolSize = config.getInt("execution", null, "fanOutThreadPoolSize", 25);
+    if (poolSize == 0) {
+      return MoreExecutors.newDirectExecutorService();
+    }
+    return queues.createQueue(poolSize, "FanOut");
+  }
+
+  @Provides
+  @Singleton
+  @ChangeUpdateExecutor
+  public ListeningExecutorService createChangeUpdateExecutor(@GerritServerConfig Config config) {
+    int poolSize = config.getInt("receive", null, "changeUpdateThreads", 1);
+    if (poolSize <= 1) {
+      return MoreExecutors.newDirectExecutorService();
+    }
+    return MoreExecutors.listeningDecorator(
+        new LoggingContextAwareExecutorService(
+            MoreExecutors.getExitingExecutorService(
+                new ThreadPoolExecutor(
+                    1,
+                    poolSize,
+                    10,
+                    TimeUnit.MINUTES,
+                    new ArrayBlockingQueue<Runnable>(poolSize),
+                    new ThreadFactoryBuilder()
+                        .setNameFormat("ChangeUpdate-%d")
+                        .setDaemon(true)
+                        .build(),
+                    new ThreadPoolExecutor.CallerRunsPolicy()))));
+  }
+}