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c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
82 lines
2.8 KiB
Java
82 lines
2.8 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.util;
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import static com.google.appengine.api.ThreadManager.currentRequestThreadFactory;
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import com.google.common.util.concurrent.SimpleTimeLimiter;
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import com.google.common.util.concurrent.TimeLimiter;
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import java.util.List;
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import java.util.concurrent.AbstractExecutorService;
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import java.util.concurrent.TimeUnit;
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/**
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* A factory for {@link TimeLimiter} instances that use request threads, which carry the namespace
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* and live only as long as the request that spawned them.
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* <p>
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* It is safe to reuse instances of this class, but there is no benefit in doing so over creating a
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* fresh instance each time.
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*/
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public class AppEngineTimeLimiter {
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/**
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* An {@code ExecutorService} that uses a new thread for every task.
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* <p>
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* We need to use fresh threads for each request so that we can use App Engine's request threads.
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* If we cached these threads in a thread pool (and if we were executing on a backend, where there
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* is no time limit on requests) the caching would cause the thread to keep the task that opened
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* it alive even after returning an http response, and would also cause the namespace that the
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* original thread was created in to leak out to later reuses of the thread.
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* <p>
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* Since there are no cached resources, this class doesn't have to support being shutdown.
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*/
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private static class NewRequestThreadExecutorService extends AbstractExecutorService {
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@Override
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public void execute(Runnable command) {
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currentRequestThreadFactory().newThread(command).start();
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}
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@Override
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public boolean isShutdown() {
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return false;
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}
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@Override
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public boolean isTerminated() {
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return false;
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}
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@Override
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public void shutdown() {
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throw new UnsupportedOperationException();
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}
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@Override
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public List<Runnable> shutdownNow() {
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean awaitTermination(long timeout, TimeUnit unit) {
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throw new UnsupportedOperationException();
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}
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}
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public static TimeLimiter create() {
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return new SimpleTimeLimiter(new NewRequestThreadExecutorService());
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}
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}
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