124 lines
3.6 KiB
Java
124 lines
3.6 KiB
Java
// Copyright (C) 2009 The Android Open Source Project
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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 com.google.gerrit.lifecycle;
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import com.google.common.base.Preconditions;
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import com.google.common.collect.Lists;
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import com.google.common.flogger.FluentLogger;
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import com.google.gerrit.extensions.events.LifecycleListener;
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import com.google.gerrit.extensions.registration.RegistrationHandle;
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import com.google.inject.Binding;
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import com.google.inject.Injector;
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import com.google.inject.Provider;
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import com.google.inject.TypeLiteral;
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import com.google.inject.util.Providers;
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import java.util.List;
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/** Tracks and executes registered {@link LifecycleListener}s. */
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public class LifecycleManager {
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private static final FluentLogger logger = FluentLogger.forEnclosingClass();
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private final List<Provider<LifecycleListener>> listeners = newList();
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private final List<RegistrationHandle> handles = newList();
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/** Index of the last listener to start successfully; -1 when not started. */
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private int startedIndex = -1;
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/**
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* Add a handle that must be cleared during stop.
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*
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* @param handle the handle to add.
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*/
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public void add(RegistrationHandle handle) {
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handles.add(handle);
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}
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/**
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* Add a single listener.
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*
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* @param listener the listener to add.
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*/
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public void add(LifecycleListener listener) {
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listeners.add(Providers.of(listener));
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}
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/**
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* Add a single listener.
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*
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* @param listener the listener to add.
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*/
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public void add(Provider<LifecycleListener> listener) {
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listeners.add(listener);
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}
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/**
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* Add all {@link LifecycleListener}s registered in the Injector.
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*
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* @param injector the injector to add.
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*/
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public void add(Injector injector) {
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Preconditions.checkState(startedIndex < 0, "Already started");
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for (Binding<LifecycleListener> binding : get(injector)) {
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add(binding.getProvider());
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}
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}
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/**
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* Add all {@link LifecycleListener}s registered in the Injectors.
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*
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* @param injectors the injectors to add.
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*/
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public void add(Injector... injectors) {
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for (Injector i : injectors) {
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add(i);
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}
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}
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/** Start all listeners, in the order they were registered. */
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public void start() {
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for (int i = startedIndex + 1; i < listeners.size(); i++) {
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LifecycleListener listener = listeners.get(i).get();
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startedIndex = i;
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listener.start();
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}
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}
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/** Stop all listeners, in the reverse order they were registered. */
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public void stop() {
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for (int i = handles.size() - 1; 0 <= i; i--) {
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handles.get(i).remove();
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}
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handles.clear();
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for (int i = startedIndex; 0 <= i; i--) {
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LifecycleListener obj = listeners.get(i).get();
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try {
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obj.stop();
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} catch (Throwable err) {
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logger.atWarning().withCause(err).log("Failed to stop %s", obj.getClass());
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}
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startedIndex = i - 1;
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}
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}
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private static List<Binding<LifecycleListener>> get(Injector i) {
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return i.findBindingsByType(new TypeLiteral<LifecycleListener>() {});
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}
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private static <T> List<T> newList() {
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return Lists.newArrayListWithCapacity(4);
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}
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}
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