| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.beam.runners.direct; |
| |
| import java.util.Collection; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import org.apache.beam.sdk.PipelineRunner; |
| import org.apache.beam.sdk.transforms.DoFn; |
| import org.apache.beam.sdk.transforms.DoFn.Setup; |
| import org.apache.beam.sdk.transforms.DoFn.Teardown; |
| import org.apache.beam.sdk.transforms.reflect.DoFnInvokers; |
| import org.apache.beam.sdk.util.SerializableUtils; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.CacheBuilder; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.CacheLoader; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.LoadingCache; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.RemovalListener; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.cache.RemovalNotification; |
| |
| /** |
| * Manages {@link DoFn} setup, teardown, and serialization. |
| * |
| * <p>{@link DoFnLifecycleManager} is similar to a {@link ThreadLocal} storing a {@link DoFn}, but |
| * calls the {@link DoFn} {@link Setup @Setup} method the first time the {@link DoFn} is obtained |
| * and {@link Teardown @Teardown} whenever the {@link DoFn} is removed, and provides a method for |
| * clearing all cached {@link DoFn DoFns}. |
| */ |
| class DoFnLifecycleManager { |
| public static DoFnLifecycleManager of(DoFn<?, ?> original) { |
| return new DoFnLifecycleManager(original); |
| } |
| |
| private final LoadingCache<Thread, DoFn<?, ?>> outstanding; |
| private final ConcurrentMap<Thread, Exception> thrownOnTeardown; |
| |
| private DoFnLifecycleManager(DoFn<?, ?> original) { |
| this.outstanding = |
| CacheBuilder.newBuilder() |
| .removalListener(new TeardownRemovedFnListener()) |
| .build(new DeserializingCacheLoader(original)); |
| thrownOnTeardown = new ConcurrentHashMap<>(); |
| } |
| |
| public <InputT, OutputT> DoFn<InputT, OutputT> get() throws Exception { |
| Thread currentThread = Thread.currentThread(); |
| return (DoFn<InputT, OutputT>) outstanding.get(currentThread); |
| } |
| |
| public void remove() throws Exception { |
| Thread currentThread = Thread.currentThread(); |
| outstanding.invalidate(currentThread); |
| // Block until the invalidate is fully completed |
| outstanding.cleanUp(); |
| // Remove to try too avoid reporting the same teardown exception twice. May still double-report, |
| // but the second will be suppressed. |
| Exception thrown = thrownOnTeardown.remove(currentThread); |
| if (thrown != null) { |
| throw thrown; |
| } |
| } |
| |
| /** |
| * Remove all {@link DoFn DoFns} from this {@link DoFnLifecycleManager}. Returns all exceptions |
| * that were thrown while calling the remove methods. |
| * |
| * <p>If the returned Collection is nonempty, an exception was thrown from at least one {@link |
| * DoFn.Teardown @Teardown} method, and the {@link PipelineRunner} should throw an exception. |
| */ |
| public Collection<Exception> removeAll() throws Exception { |
| outstanding.invalidateAll(); |
| // Make sure all of the teardowns are run |
| outstanding.cleanUp(); |
| return thrownOnTeardown.values(); |
| } |
| |
| private static class DeserializingCacheLoader extends CacheLoader<Thread, DoFn<?, ?>> { |
| private final byte[] original; |
| |
| public DeserializingCacheLoader(DoFn<?, ?> original) { |
| this.original = SerializableUtils.serializeToByteArray(original); |
| } |
| |
| @Override |
| public DoFn<?, ?> load(Thread key) throws Exception { |
| DoFn<?, ?> fn = |
| (DoFn<?, ?>) |
| SerializableUtils.deserializeFromByteArray( |
| original, "DoFn Copy in thread " + key.getName()); |
| DoFnInvokers.tryInvokeSetupFor(fn); |
| return fn; |
| } |
| } |
| |
| private class TeardownRemovedFnListener implements RemovalListener<Thread, DoFn<?, ?>> { |
| @Override |
| public void onRemoval(RemovalNotification<Thread, DoFn<?, ?>> notification) { |
| try { |
| DoFnInvokers.invokerFor(notification.getValue()).invokeTeardown(); |
| } catch (Exception e) { |
| thrownOnTeardown.put(notification.getKey(), e); |
| } |
| } |
| } |
| } |