Issue 932:transition to multi-threaded google appengine

core/src/main/java/org/jclouds/concurrent/config/DescribedFuture.java

@@ -0,0 +1,130 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds licenses this file
+ * to you 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 org.jclouds.concurrent.config;
+
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+public class DescribedFuture<T> implements Future<T> {
+   protected final Future<T> delegate;
+   private final String description;
+   private StackTraceElement[] submissionTrace;
+
+   public DescribedFuture(Future<T> delegate, String description, StackTraceElement[] submissionTrace) {
+      this.delegate = delegate;
+      this.description = description;
+      this.submissionTrace = submissionTrace;
+   }
+
+   @Override
+   public boolean cancel(boolean arg0) {
+      return delegate.cancel(arg0);
+   }
+
+   @Override
+   public T get() throws InterruptedException, ExecutionException {
+      try {
+         return delegate.get();
+      } catch (ExecutionException e) {
+         throw ensureCauseHasSubmissionTrace(e);
+      } catch (InterruptedException e) {
+         throw ensureCauseHasSubmissionTrace(e);
+      }
+   }
+
+   @Override
+   public T get(long arg0, TimeUnit arg1) throws InterruptedException, ExecutionException, TimeoutException {
+      try {
+         return delegate.get(arg0, arg1);
+      } catch (ExecutionException e) {
+         throw ensureCauseHasSubmissionTrace(e);
+      } catch (InterruptedException e) {
+         throw ensureCauseHasSubmissionTrace(e);
+      } catch (TimeoutException e) {
+         throw ensureCauseHasSubmissionTrace(e);
+      }
+   }
+
+   /** This method does the work to ensure _if_ a submission stack trace was provided,
+    * it is included in the exception.  most errors are thrown from the frame of the
+    * Future.get call, with a cause that took place in the executor's thread.
+    * We extend the stack trace of that cause with the submission stack trace.
+    * (An alternative would be to put the stack trace as a root cause,
+    * at the bottom of the stack, or appended to all traces, or inserted
+    * after the second cause, etc ... but since we can't change the "Caused by:"
+    * method in Throwable the compromise made here seems best.)
+    */
+   private <ET extends Exception> ET ensureCauseHasSubmissionTrace(ET e) {
+      if (submissionTrace==null) return e;
+      if (e.getCause()==null) {
+         ExecutionException ee = new ExecutionException("task submitted from the following trace", null);
+         e.initCause(ee);
+         return e;
+      }
+      Throwable cause = e.getCause();
+      StackTraceElement[] causeTrace = cause.getStackTrace();
+      boolean causeIncludesSubmissionTrace = submissionTrace.length >= causeTrace.length;
+      for (int i=0; causeIncludesSubmissionTrace && i<submissionTrace.length; i++) {
+         if (!causeTrace[causeTrace.length-1-i].equals(submissionTrace[submissionTrace.length-1-i])) {
+            causeIncludesSubmissionTrace = false;
+         }
+      }
+      
+      if (!causeIncludesSubmissionTrace) {
+         cause.setStackTrace(merge(causeTrace, submissionTrace));
+      }
+      
+      return e;
+   }
+
+   private StackTraceElement[] merge(StackTraceElement[] t1, StackTraceElement[] t2) {
+      StackTraceElement[] t12 = new StackTraceElement[t1.length + t2.length];
+      System.arraycopy(t1, 0, t12, 0, t1.length);
+      System.arraycopy(t2, 0, t12, t1.length, t2.length);
+      return t12;
+   }
+
+   @Override
+   public boolean isCancelled() {
+      return delegate.isCancelled();
+   }
+
+   @Override
+   public boolean isDone() {
+      return delegate.isDone();
+   }
+
+   @Override
+   public boolean equals(Object obj) {
+      return delegate.equals(obj);
+   }
+
+   @Override
+   public int hashCode() {
+      return delegate.hashCode();
+   }
+
+   @Override
+   public String toString() {
+      return description;
+   }
+
+}

core/src/main/java/org/jclouds/concurrent/config/DescribingExecutorService.java

@@ -0,0 +1,123 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds licenses this file
+ * to you 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 org.jclouds.concurrent.config;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+public class DescribingExecutorService implements ExecutorService {
+
+   protected final ExecutorService delegate;
+
+   public DescribingExecutorService(ExecutorService delegate) {
+      this.delegate = checkNotNull(delegate, "delegate");
+   }
+
+   @Override
+   public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
+      return delegate.awaitTermination(timeout, unit);
+   }
+
+   @Override
+   public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks) throws InterruptedException {
+      return delegate.invokeAll(tasks);
+   }
+
+   @Override
+   public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
+            throws InterruptedException {
+      return delegate.invokeAll(tasks, timeout, unit);
+   }
+
+   @Override
+   public <T> T invokeAny(Collection<? extends Callable<T>> tasks) throws InterruptedException, ExecutionException {
+      return delegate.invokeAny(tasks);
+   }
+
+   @Override
+   public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
+            throws InterruptedException, ExecutionException, TimeoutException {
+      return delegate.invokeAny(tasks, timeout, unit);
+   }
+
+   @Override
+   public boolean isShutdown() {
+      return delegate.isShutdown();
+   }
+
+   @Override
+   public boolean isTerminated() {
+      return delegate.isTerminated();
+   }
+
+   @Override
+   public void shutdown() {
+      delegate.shutdown();
+   }
+
+   @Override
+   public List<Runnable> shutdownNow() {
+      return delegate.shutdownNow();
+   }
+
+   @Override
+   public <T> Future<T> submit(Callable<T> task) {
+      return new DescribedFuture<T>(delegate.submit(task), task.toString(), ExecutorServiceModule.getStackTraceHere());
+   }
+
+   @SuppressWarnings({ "unchecked", "rawtypes" })
+   @Override
+   public Future<?> submit(Runnable task) {
+      return new DescribedFuture(delegate.submit(task), task.toString(), ExecutorServiceModule.getStackTraceHere());
+   }
+
+   @Override
+   public <T> Future<T> submit(Runnable task, T result) {
+      return new DescribedFuture<T>(delegate.submit(task, result), task.toString(), ExecutorServiceModule.getStackTraceHere());
+   }
+
+   @Override
+   public void execute(Runnable arg0) {
+      delegate.execute(arg0);
+   }
+
+   @Override
+   public boolean equals(Object obj) {
+      return delegate.equals(obj);
+   }
+
+   @Override
+   public int hashCode() {
+      return delegate.hashCode();
+   }
+
+   @Override
+   public String toString() {
+      return delegate.toString();
+   }
+
+}

core/src/main/java/org/jclouds/concurrent/config/ExecutorServiceModule.java

@@ -18,20 +18,14 @@
  */
 package org.jclouds.concurrent.config;
 
-import static com.google.common.base.Preconditions.checkNotNull;
 import static org.jclouds.concurrent.DynamicExecutors.newScalingThreadPool;
 
 import java.io.Closeable;
 import java.io.IOException;
-import java.util.Collection;
 import java.util.List;
-import java.util.concurrent.Callable;
-import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
-import java.util.concurrent.Future;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
+import java.util.concurrent.ThreadFactory;
 
 import javax.annotation.Resource;
 import javax.inject.Inject;
@@ -95,14 +89,14 @@ public class ExecutorServiceModule extends AbstractModule {
       this.ioExecutorFromConstructor = addToStringOnSubmit(checkNotGuavaSameThreadExecutor(ioThreads));
    }
 
-   static ExecutorService addToStringOnSubmit(ExecutorService executor) {
+   ExecutorService addToStringOnSubmit(ExecutorService executor) {
       if (executor != null) {
          return new DescribingExecutorService(executor);
       }
       return executor;
    }
 
-   static ExecutorService checkNotGuavaSameThreadExecutor(ExecutorService executor) {
+   ExecutorService checkNotGuavaSameThreadExecutor(ExecutorService executor) {
       // we detect behavior based on the class
       if (executor != null && !(executor.getClass().isAnnotationPresent(SingleThreaded.class))
                && executor.getClass().getSimpleName().indexOf("SameThread") != -1) {
@@ -122,205 +116,6 @@ public class ExecutorServiceModule extends AbstractModule {
    protected void configure() {
    }
 
-   static class DescribingExecutorService implements ExecutorService {
-
-      protected final ExecutorService delegate;
-
-      public DescribingExecutorService(ExecutorService delegate) {
-         this.delegate = checkNotNull(delegate, "delegate");
-      }
-
-      @Override
-      public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
-         return delegate.awaitTermination(timeout, unit);
-      }
-
-      @Override
-      public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks) throws InterruptedException {
-         return delegate.invokeAll(tasks);
-      }
-
-      @Override
-      public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
-               throws InterruptedException {
-         return delegate.invokeAll(tasks, timeout, unit);
-      }
-
-      @Override
-      public <T> T invokeAny(Collection<? extends Callable<T>> tasks) throws InterruptedException, ExecutionException {
-         return delegate.invokeAny(tasks);
-      }
-
-      @Override
-      public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
-               throws InterruptedException, ExecutionException, TimeoutException {
-         return delegate.invokeAny(tasks, timeout, unit);
-      }
-
-      @Override
-      public boolean isShutdown() {
-         return delegate.isShutdown();
-      }
-
-      @Override
-      public boolean isTerminated() {
-         return delegate.isTerminated();
-      }
-
-      @Override
-      public void shutdown() {
-         delegate.shutdown();
-      }
-
-      @Override
-      public List<Runnable> shutdownNow() {
-         return delegate.shutdownNow();
-      }
-
-      @Override
-      public <T> Future<T> submit(Callable<T> task) {
-         return new DescribedFuture<T>(delegate.submit(task), task.toString(), getStackTraceHere());
-      }
-
-      @SuppressWarnings({ "unchecked", "rawtypes" })
-      @Override
-      public Future<?> submit(Runnable task) {
-         return new DescribedFuture(delegate.submit(task), task.toString(), getStackTraceHere());
-      }
-
-      @Override
-      public <T> Future<T> submit(Runnable task, T result) {
-         return new DescribedFuture<T>(delegate.submit(task, result), task.toString(), getStackTraceHere());
-      }
-
-      @Override
-      public void execute(Runnable arg0) {
-         delegate.execute(arg0);
-      }
-
-      @Override
-      public boolean equals(Object obj) {
-         return delegate.equals(obj);
-      }
-
-      @Override
-      public int hashCode() {
-         return delegate.hashCode();
-      }
-
-      @Override
-      public String toString() {
-         return delegate.toString();
-      }
-
-   }
-
-   static class DescribedFuture<T> implements Future<T> {
-      protected final Future<T> delegate;
-      private final String description;
-      private StackTraceElement[] submissionTrace;
-
-      public DescribedFuture(Future<T> delegate, String description, StackTraceElement[] submissionTrace) {
-         this.delegate = delegate;
-         this.description = description;
-         this.submissionTrace = submissionTrace;
-      }
-
-      @Override
-      public boolean cancel(boolean arg0) {
-         return delegate.cancel(arg0);
-      }
-
-      @Override
-      public T get() throws InterruptedException, ExecutionException {
-         try {
-            return delegate.get();
-         } catch (ExecutionException e) {
-            throw ensureCauseHasSubmissionTrace(e);
-         } catch (InterruptedException e) {
-            throw ensureCauseHasSubmissionTrace(e);
-         }
-      }
-
-      @Override
-      public T get(long arg0, TimeUnit arg1) throws InterruptedException, ExecutionException, TimeoutException {
-         try {
-            return delegate.get(arg0, arg1);
-         } catch (ExecutionException e) {
-            throw ensureCauseHasSubmissionTrace(e);
-         } catch (InterruptedException e) {
-            throw ensureCauseHasSubmissionTrace(e);
-         } catch (TimeoutException e) {
-            throw ensureCauseHasSubmissionTrace(e);
-         }
-      }
-
-      /** This method does the work to ensure _if_ a submission stack trace was provided,
-       * it is included in the exception.  most errors are thrown from the frame of the
-       * Future.get call, with a cause that took place in the executor's thread.
-       * We extend the stack trace of that cause with the submission stack trace.
-       * (An alternative would be to put the stack trace as a root cause,
-       * at the bottom of the stack, or appended to all traces, or inserted
-       * after the second cause, etc ... but since we can't change the "Caused by:"
-       * method in Throwable the compromise made here seems best.)
-       */
-      private <ET extends Exception> ET ensureCauseHasSubmissionTrace(ET e) {
-         if (submissionTrace==null) return e;
-         if (e.getCause()==null) {
-            ExecutionException ee = new ExecutionException("task submitted from the following trace", null);
-            e.initCause(ee);
-            return e;
-         }
-         Throwable cause = e.getCause();
-         StackTraceElement[] causeTrace = cause.getStackTrace();
-         boolean causeIncludesSubmissionTrace = submissionTrace.length >= causeTrace.length;
-         for (int i=0; causeIncludesSubmissionTrace && i<submissionTrace.length; i++) {
-            if (!causeTrace[causeTrace.length-1-i].equals(submissionTrace[submissionTrace.length-1-i])) {
-               causeIncludesSubmissionTrace = false;
-            }
-         }
-         
-         if (!causeIncludesSubmissionTrace) {
-            cause.setStackTrace(merge(causeTrace, submissionTrace));
-         }
-         
-         return e;
-      }
-
-      private StackTraceElement[] merge(StackTraceElement[] t1, StackTraceElement[] t2) {
-         StackTraceElement[] t12 = new StackTraceElement[t1.length + t2.length];
-         System.arraycopy(t1, 0, t12, 0, t1.length);
-         System.arraycopy(t2, 0, t12, t1.length, t2.length);
-         return t12;
-      }
-
-      @Override
-      public boolean isCancelled() {
-         return delegate.isCancelled();
-      }
-
-      @Override
-      public boolean isDone() {
-         return delegate.isDone();
-      }
-
-      @Override
-      public boolean equals(Object obj) {
-         return delegate.equals(obj);
-      }
-
-      @Override
-      public int hashCode() {
-         return delegate.hashCode();
-      }
-
-      @Override
-      public String toString() {
-         return description;
-      }
-
-   }
-   
    @Provides
    @Singleton
    @Named(Constants.PROPERTY_USER_THREADS)
@@ -346,22 +141,25 @@ public class ExecutorServiceModule extends AbstractModule {
    }
 
    @VisibleForTesting
-   static ExecutorService newCachedThreadPoolNamed(String name) {
-      return Executors.newCachedThreadPool(new ThreadFactoryBuilder().setNameFormat(name).setThreadFactory(
-               Executors.defaultThreadFactory()).build());
+   ExecutorService newCachedThreadPoolNamed(String name) {
+      return Executors.newCachedThreadPool(namedThreadFactory(name));
    }
 
    @VisibleForTesting
-   static ExecutorService newThreadPoolNamed(String name, int maxCount) {
+   ExecutorService newThreadPoolNamed(String name, int maxCount) {
       return maxCount == 0 ? newCachedThreadPoolNamed(name) : newScalingThreadPoolNamed(name, maxCount);
    }
 
    @VisibleForTesting
-   static ExecutorService newScalingThreadPoolNamed(String name, int maxCount) {
-      return newScalingThreadPool(1, maxCount, 60L * 1000, new ThreadFactoryBuilder().setNameFormat(name)
-               .setThreadFactory(Executors.defaultThreadFactory()).build());
+   ExecutorService newScalingThreadPoolNamed(String name, int maxCount) {
+      return newScalingThreadPool(1, maxCount, 60L * 1000, namedThreadFactory(name));
    }
 
+   protected ThreadFactory namedThreadFactory(String name) {
+      return new ThreadFactoryBuilder().setNameFormat(name).setThreadFactory(Executors.defaultThreadFactory()).build();
+   }
+
+
    /** returns the stack trace at the caller */
    static StackTraceElement[] getStackTraceHere() {
       // remove the first two items in the stack trace (because the first one refers to the call to 

core/src/main/java/org/jclouds/concurrent/config/ScheduledExecutorServiceModule.java

@@ -15,8 +15,6 @@ import javax.inject.Named;
 import javax.inject.Singleton;
 
 import org.jclouds.Constants;
-import org.jclouds.concurrent.config.ExecutorServiceModule.DescribedFuture;
-import org.jclouds.concurrent.config.ExecutorServiceModule.DescribingExecutorService;
 import org.jclouds.lifecycle.Closer;
 
 import com.google.common.annotations.VisibleForTesting;

core/src/test/java/org/jclouds/cache/internal/BackoffExponentiallyAndRetryOnThrowableCacheLoaderTest.java

@@ -31,7 +31,7 @@ import org.testng.annotations.Test;
 
 import com.google.common.cache.CacheLoader;
 
-@Test(groups = "unit", testName = "BackoffExponentiallyAndRetryOnThrowableCacheLoaderTest")
+@Test(groups = "unit", singleThreaded = true, testName = "BackoffExponentiallyAndRetryOnThrowableCacheLoaderTest")
 public class BackoffExponentiallyAndRetryOnThrowableCacheLoaderTest {
    private CacheLoader<String, Boolean> mock;
 

drivers/gae/src/main/java/org/jclouds/gae/AsyncGaeHttpCommandExecutorService.java

@@ -32,7 +32,6 @@ import javax.inject.Singleton;
 
 import org.jclouds.Constants;
 import org.jclouds.concurrent.Futures;
-import org.jclouds.concurrent.SingleThreaded;
 import org.jclouds.http.HttpCommand;
 import org.jclouds.http.HttpCommandExecutorService;
 import org.jclouds.http.HttpRequest;
@@ -57,7 +56,6 @@ import com.google.common.util.concurrent.ListenableFuture;
  * 
  * @author Adrian Cole
  */
-@SingleThreaded
 @Singleton
 public class AsyncGaeHttpCommandExecutorService implements HttpCommandExecutorService {
    private final ExecutorService service;

drivers/gae/src/main/java/org/jclouds/gae/config/AsyncGoogleAppEngineConfigurationModule.java

@@ -24,6 +24,10 @@ import org.jclouds.gae.AsyncGaeHttpCommandExecutorService;
 import org.jclouds.http.HttpCommandExecutorService;
 import org.jclouds.http.config.ConfiguresHttpCommandExecutorService;
 
+import com.google.common.base.Supplier;
+import com.google.common.util.concurrent.ListeningExecutorService;
+import com.google.inject.Module;
+
 /**
  * Configures {@link AsyncGaeHttpCommandExecutorService}.
  * 
@@ -33,7 +37,23 @@ import org.jclouds.http.config.ConfiguresHttpCommandExecutorService;
 @ConfiguresExecutorService
 @SingleThreaded
 public class AsyncGoogleAppEngineConfigurationModule extends GoogleAppEngineConfigurationModule {
-   
+   public AsyncGoogleAppEngineConfigurationModule() {
+      super();
+   }
+
+   public AsyncGoogleAppEngineConfigurationModule(Module executorServiceModule) {
+      super(executorServiceModule);
+   }
+
+   /**
+    * Used when you are creating multiple contexts in the same app.
+    * @param memoizedCurrentRequestExecutorService
+    * @see CurrentRequestExecutorServiceModule#memoizedCurrentRequestExecutorService
+    */
+   public AsyncGoogleAppEngineConfigurationModule(Supplier<ListeningExecutorService> memoizedCurrentRequestExecutorService) {
+      super(memoizedCurrentRequestExecutorService);
+   }
+
    protected void bindHttpCommandExecutorService() {
       bind(HttpCommandExecutorService.class).to(AsyncGaeHttpCommandExecutorService.class);
    }

drivers/gae/src/main/java/org/jclouds/gae/config/CurrentRequestExecutorServiceModule.java

@@ -0,0 +1,118 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds licenses this file
+ * to you 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 org.jclouds.gae.config;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.jclouds.concurrent.DynamicExecutors.newScalingThreadPool;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.ThreadFactory;
+
+import javax.inject.Named;
+import javax.inject.Singleton;
+
+import org.jclouds.Constants;
+import org.jclouds.concurrent.config.ConfiguresExecutorService;
+import org.jclouds.concurrent.config.DescribingExecutorService;
+
+import com.google.appengine.api.ThreadManager;
+import com.google.apphosting.api.ApiProxy;
+import com.google.common.annotations.Beta;
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
+import com.google.common.util.concurrent.ListeningExecutorService;
+import com.google.common.util.concurrent.MoreExecutors;
+import com.google.inject.AbstractModule;
+import com.google.inject.Provides;
+
+/**
+ * 
+ * @author Adrian Cole
+ */
+@Beta
+@ConfiguresExecutorService
+public class CurrentRequestExecutorServiceModule extends AbstractModule {
+
+   private final Supplier<ListeningExecutorService> memoizedCurrentRequestExecutorService;
+
+   public CurrentRequestExecutorServiceModule() {
+      this(memoizedCurrentRequestExecutorService());
+   }
+
+   /**
+    * Used when you are creating multiple contexts in the same app.
+    * 
+    * @param memoizedCurrentRequestExecutorService
+    * @see #memoizedCurrentRequestExecutorService
+    */
+   public CurrentRequestExecutorServiceModule(Supplier<ListeningExecutorService> memoizedCurrentRequestExecutorService) {
+      this.memoizedCurrentRequestExecutorService = memoizedCurrentRequestExecutorService;
+   }
+
+   /**
+    * Used when you are creating multiple contexts in the same app.
+    * 
+    * @param currentRequestExecutorService
+    * @see #currentRequestExecutorService
+    */
+   public CurrentRequestExecutorServiceModule(ListeningExecutorService currentRequestExecutorService) {
+      this.memoizedCurrentRequestExecutorService = Suppliers.ofInstance(currentRequestExecutorService);
+   }
+
+   @Override
+   protected void configure() {
+   }
+
+   public static Supplier<ListeningExecutorService> memoizedCurrentRequestExecutorService() {
+      return Suppliers.memoize(new Supplier<ListeningExecutorService>() {
+         // important that these are lazy bound vs in configure, as GAE may not
+         // quite be initialized, yet!
+         @Override
+         public ListeningExecutorService get() {
+            return currentRequestExecutorService();
+         }
+
+      });
+
+   }
+
+   public static ListeningExecutorService currentRequestExecutorService() {
+      ThreadFactory factory = checkNotNull(ThreadManager.currentRequestThreadFactory(),
+            "ThreadManager.currentRequestThreadFactory()");
+      // GAE requests cannot exceed 10 threads per request
+      int maxThreads = 10;
+      long keepAlive = ApiProxy.getCurrentEnvironment().getRemainingMillis();
+      ExecutorService pool = newScalingThreadPool(0, maxThreads, keepAlive, factory);
+      return MoreExecutors.listeningDecorator(new DescribingExecutorService(pool));
+   }
+
+   @Provides
+   @Singleton
+   @Named(Constants.PROPERTY_USER_THREADS)
+   protected ExecutorService userThreads() {
+      return memoizedCurrentRequestExecutorService.get();
+   }
+
+   @Provides
+   @Singleton
+   @Named(Constants.PROPERTY_IO_WORKER_THREADS)
+   protected ExecutorService ioThreads() {
+      return memoizedCurrentRequestExecutorService.get();
+   }
+}

drivers/gae/src/main/java/org/jclouds/gae/config/GoogleAppEngineConfigurationModule.java

@@ -30,6 +30,10 @@ import org.jclouds.http.config.ConfiguresHttpCommandExecutorService;
 
 import com.google.appengine.api.urlfetch.URLFetchService;
 import com.google.appengine.api.urlfetch.URLFetchServiceFactory;
+import com.google.common.base.Supplier;
+import com.google.common.util.concurrent.ListeningExecutorService;
+import com.google.inject.AbstractModule;
+import com.google.inject.Module;
 import com.google.inject.Provides;
 
 /**
@@ -40,15 +44,36 @@ import com.google.inject.Provides;
 @ConfiguresHttpCommandExecutorService
 @ConfiguresExecutorService
 @SingleThreaded
-public class GoogleAppEngineConfigurationModule extends ExecutorServiceModule {
+public class GoogleAppEngineConfigurationModule extends AbstractModule {
+   private final Module executorServiceModule;
 
    public GoogleAppEngineConfigurationModule() {
-      super(MoreExecutors.sameThreadExecutor(), MoreExecutors.sameThreadExecutor());
+      this(new ExecutorServiceModule(MoreExecutors.sameThreadExecutor(), MoreExecutors.sameThreadExecutor()));
+   }
+
+   /**
+    * Used when you are creating multiple contexts in the same app.
+    * 
+    * @param currentRequestExecutorService
+    * @see CurrentRequestExecutorServiceModule#currentRequestExecutorService
+    */
+   public GoogleAppEngineConfigurationModule(Module executorServiceModule) {
+      this.executorServiceModule = executorServiceModule;
+   }
+
+   /**
+    * Used when you are creating multiple contexts in the same app.
+    * 
+    * @param memoizedCurrentRequestExecutorService
+    * @see CurrentRequestExecutorServiceModule#memoizedCurrentRequestExecutorService
+    */
+   public GoogleAppEngineConfigurationModule(Supplier<ListeningExecutorService> memoizedCurrentRequestExecutorService) {
+      this.executorServiceModule = new CurrentRequestExecutorServiceModule(memoizedCurrentRequestExecutorService);
    }
 
    @Override
    protected void configure() {
-      super.configure();
+      install(executorServiceModule);
       bind(TransformingHttpCommandExecutorService.class).to(TransformingHttpCommandExecutorServiceImpl.class);
       bindHttpCommandExecutorService();
    }
@@ -58,7 +83,7 @@ public class GoogleAppEngineConfigurationModule extends ExecutorServiceModule {
    }
 
    @Provides
-   URLFetchService provideURLFetchService() {
+   protected URLFetchService provideURLFetchService() {
       return URLFetchServiceFactory.getURLFetchService();
    }
 }

drivers/gae/src/main/java/org/jclouds/gae/config/MultithreadedAsyncGoogleAppEngineConfigurationModule.java

@@ -0,0 +1,68 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds licenses this file
+ * to you 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 org.jclouds.gae.config;
+
+import org.jclouds.concurrent.config.ConfiguresExecutorService;
+import org.jclouds.gae.AsyncGaeHttpCommandExecutorService;
+import org.jclouds.http.HttpCommandExecutorService;
+import org.jclouds.http.config.ConfiguresHttpCommandExecutorService;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Supplier;
+import com.google.common.util.concurrent.ListeningExecutorService;
+
+/**
+ * Configures {@link AsyncGaeHttpCommandExecutorService}.
+ * 
+ * @author Adrian Cole
+ */
+@Beta
+@ConfiguresHttpCommandExecutorService
+@ConfiguresExecutorService
+public class MultithreadedAsyncGoogleAppEngineConfigurationModule extends GoogleAppEngineConfigurationModule {
+   public MultithreadedAsyncGoogleAppEngineConfigurationModule() {
+      super(new CurrentRequestExecutorServiceModule());
+   }
+
+   /**
+    * Used when you are creating multiple contexts in the same app.
+    * 
+    * @param currentRequestThreadFactory
+    * @see CurrentRequestExecutorServiceModule#currentRequestThreadFactory
+    */
+   public MultithreadedAsyncGoogleAppEngineConfigurationModule(ListeningExecutorService currentRequestThreadFactory) {
+      super(new CurrentRequestExecutorServiceModule(currentRequestThreadFactory));
+   }
+
+   /**
+    * Used when you are creating multiple contexts in the same app.
+    * 
+    * @param memoizedCurrentRequestExecutorService
+    * @see CurrentRequestExecutorServiceModule#memoizedCurrentRequestExecutorService
+    */
+   public MultithreadedAsyncGoogleAppEngineConfigurationModule(
+         Supplier<ListeningExecutorService> memoizedCurrentRequestExecutorService) {
+      super(memoizedCurrentRequestExecutorService);
+   }
+
+   protected void bindHttpCommandExecutorService() {
+      bind(HttpCommandExecutorService.class).to(AsyncGaeHttpCommandExecutorService.class);
+   }
+
+}

drivers/gae/src/test/java/org/jclouds/gae/AsyncGaeHttpCommandExecutorServiceIntegrationTest.java

@@ -205,7 +205,8 @@ public class AsyncGaeHttpCommandExecutorServiceIntegrationTest extends BaseHttpC
 
    @BeforeMethod
    void setupApiProxy() {
-      new LocalServiceTestHelper(new LocalURLFetchServiceTestConfig()).setUp();
+      LocalServiceTestHelper helper = new LocalServiceTestHelper(new LocalURLFetchServiceTestConfig());
+      helper.setUp();
    }
 
    @Override
@@ -316,6 +317,7 @@ public class AsyncGaeHttpCommandExecutorServiceIntegrationTest extends BaseHttpC
    }
 
    protected Module createConnectionModule() {
+      setupApiProxy();
       return new AsyncGoogleAppEngineConfigurationModule();
    }
 

drivers/gae/src/test/java/org/jclouds/gae/config/GoogleAppEngineConfigurationModuleTest.java

@@ -1,69 +0,0 @@
-/**
- * Licensed to jclouds, Inc. (jclouds) under one or more
- * contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  jclouds licenses this file
- * to you 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 org.jclouds.gae.config;
-
-import java.util.Properties;
-import java.util.concurrent.ExecutorService;
-
-import javax.ws.rs.core.UriBuilder;
-
-import org.jclouds.Constants;
-import org.jclouds.gae.GaeHttpCommandExecutorService;
-import org.jclouds.http.HttpCommandExecutorService;
-import org.jclouds.logging.Logger;
-import org.jclouds.logging.Logger.LoggerFactory;
-import org.jclouds.rest.internal.BaseRestApiMetadata;
-import org.testng.annotations.Test;
-
-import com.google.inject.Guice;
-import com.google.inject.Injector;
-import com.google.inject.Key;
-import com.google.inject.name.Names;
-import com.sun.jersey.api.uri.UriBuilderImpl;
-
-/**
- * Tests the ability to configure a {@link GoogleAppEngineConfigurationModule}
- * 
- * @author Adrian Cole
- */
-@Test
-public class GoogleAppEngineConfigurationModuleTest {
-
-   public void testConfigureBindsClient() {
-      final Properties properties = BaseRestApiMetadata.defaultProperties();
-
-      Injector i = Guice.createInjector(new GoogleAppEngineConfigurationModule() {
-         @Override
-         protected void configure() {
-            Names.bindProperties(binder(), properties);
-            bind(Logger.LoggerFactory.class).toInstance(new LoggerFactory() {
-               public Logger getLogger(String category) {
-                  return Logger.NULL;
-               }
-            });
-            bind(UriBuilder.class).to(UriBuilderImpl.class);
-            super.configure();
-         }
-      });
-      HttpCommandExecutorService client = i.getInstance(HttpCommandExecutorService.class);
-      i.getInstance(Key.get(ExecutorService.class, Names.named(Constants.PROPERTY_USER_THREADS)));
-      // TODO check single threaded;
-      assert client instanceof GaeHttpCommandExecutorService;
-   }
-}