mv com/google/domain/registry google/registry

This change renames directories in preparation for the great package
rename. The repository is now in a broken state because the code
itself hasn't been updated. However this should ensure that git
correctly preserves history for each file.

javatests/google/registry/server/ServletWrapperDelegatorServlet.java

@@ -0,0 +1,84 @@
+// Copyright 2016 The Domain Registry 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.domain.registry.server;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Suppliers.memoize;
+
+import com.google.common.base.Supplier;
+import com.google.common.base.Throwables;
+import com.google.common.util.concurrent.Uninterruptibles;
+
+import java.io.IOException;
+import java.util.Queue;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.FutureTask;
+
+import javax.annotation.Nullable;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ * Servlet that wraps a servlet and delegates request execution to a queue.
+ *
+ * @see TestServer
+ */
+public final class ServletWrapperDelegatorServlet extends HttpServlet {
+
+  private final Queue<FutureTask<Void>> requestQueue;
+  private final Supplier<HttpServlet> servlet;
+
+  ServletWrapperDelegatorServlet(
+      Class<? extends HttpServlet> servletClass,
+      Queue<FutureTask<Void>> requestQueue) {
+    this.servlet = lazilyInstantiate(checkNotNull(servletClass, "servletClass"));
+    this.requestQueue = checkNotNull(requestQueue, "requestQueue");
+  }
+
+  @Override
+  public void service(final HttpServletRequest req, final HttpServletResponse rsp)
+      throws ServletException, IOException {
+    FutureTask<Void> task = new FutureTask<>(new Callable<Void>() {
+      @Nullable
+      @Override
+      public Void call() throws ServletException, IOException {
+        servlet.get().service(req, rsp);
+        return null;
+      }});
+    requestQueue.add(task);
+    try {
+      Uninterruptibles.getUninterruptibly(task);
+    } catch (ExecutionException e) {
+      Throwables.propagateIfInstanceOf(e.getCause(), ServletException.class);
+      Throwables.propagateIfInstanceOf(e.getCause(), IOException.class);
+      throw Throwables.propagate(e.getCause());
+    }
+  }
+
+  private static <T> Supplier<T> lazilyInstantiate(final Class<? extends T> clazz) {
+    return memoize(new Supplier<T>() {
+      @Override
+      public T get() {
+        try {
+          return clazz.newInstance();
+        } catch (InstantiationException | IllegalAccessException e) {
+          throw new RuntimeException(e);
+        }
+      }});
+  }
+}