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a50ef39c04
We're going to need to switch away from Guava's Functions and Predicates for everything and replace them with the java.util versions. Unfortunately there does not appear to be an automated tool to do this all at once. Refaster got close but doesn't seem to care about these particular types of mismatch (I suspect we're using a different version of the JDK than the outside world; ours is OK with Guava classes). This also bumps up Guava to 0.23, which is needed for some new functionality used in combination with Java 8 features. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=170531539
81 lines
2.7 KiB
Java
81 lines
2.7 KiB
Java
// Copyright 2017 The Nomulus 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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*
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* <p>It is safe to reuse instances of this class, but there is no benefit in doing so over creating
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* a 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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*
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* <p>We need to use fresh threads for each request so that we can use App Engine's request
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* threads. If we cached these threads in a thread pool (and if we were executing on a backend,
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* where there is no time limit on requests) the caching would cause the thread to keep the task
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* that opened it alive even after returning an http response, and would also cause the namespace
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* that the original thread was created in to leak out to later reuses of the thread.
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*
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* <p>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 SimpleTimeLimiter.create(new NewRequestThreadExecutorService());
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}
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}
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