| /** |
| * 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 org.apache.aurora; |
| |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| import java.util.function.Function; |
| import java.util.stream.Collector; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.ImmutableMultimap; |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.util.concurrent.Service; |
| import com.google.common.util.concurrent.Service.State; |
| import com.google.common.util.concurrent.ServiceManager; |
| import com.google.inject.Inject; |
| |
| import org.apache.aurora.common.application.Lifecycle; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import static java.util.stream.Collector.Characteristics.UNORDERED; |
| |
| /** |
| * Utilities for working with Guava. |
| */ |
| public final class GuavaUtils { |
| private GuavaUtils() { |
| // Utility class. |
| } |
| |
| public static class LifecycleShutdownListener extends ServiceManager.Listener { |
| private final Lifecycle lifecycle; |
| private static final Logger LOG = LoggerFactory.getLogger(LifecycleShutdownListener.class); |
| |
| @Inject |
| LifecycleShutdownListener(Lifecycle lifecycle) { |
| this.lifecycle = lifecycle; |
| } |
| |
| @Override |
| public void failure(Service service) { |
| LOG.error("Service: " + service + " failed unexpectedly. Triggering shutdown."); |
| lifecycle.shutdown(); |
| } |
| } |
| |
| /** |
| * Collector to create a Guava ImmutableSet. |
| */ |
| public static <T> Collector<T, ?, ImmutableSet<T>> toImmutableSet() { |
| return Collector.of( |
| ImmutableSet.Builder<T>::new, |
| ImmutableSet.Builder::add, |
| (l, r) -> l.addAll(r.build()), |
| ImmutableSet.Builder::build, |
| UNORDERED); |
| } |
| |
| /** |
| * Collector to create a Guava ImmutableList. |
| */ |
| public static <T> Collector<T, ?, ImmutableList<T>> toImmutableList() { |
| return Collector.of( |
| ImmutableList.Builder<T>::new, |
| ImmutableList.Builder::add, |
| (l, r) -> l.addAll(r.build()), |
| ImmutableList.Builder::build); |
| } |
| |
| /** |
| * Collector to create a Guava ImmutableMap. |
| */ |
| public static <T, K, V> Collector<T, ?, ImmutableMap<K, V>> toImmutableMap( |
| Function<? super T, ? extends K> keyMapper, |
| Function<? super T, ? extends V> valueMapper) { |
| return Collector.of( |
| ImmutableMap.Builder<K, V>::new, |
| (r, t) -> r.put(keyMapper.apply(t), valueMapper.apply(t)), |
| (l, r) -> l.putAll(r.build()), |
| ImmutableMap.Builder::build, |
| UNORDERED); |
| } |
| |
| /** |
| * Interface for mocking. The Guava ServiceManager class is final. |
| */ |
| public interface ServiceManagerIface { |
| ServiceManagerIface startAsync(); |
| |
| void awaitHealthy(); |
| |
| ServiceManagerIface stopAsync(); |
| |
| void awaitStopped(long timeout, TimeUnit unit) throws TimeoutException; |
| |
| ImmutableMultimap<State, Service> servicesByState(); |
| } |
| |
| /** |
| * Create a new {@link ServiceManagerIface} that wraps a {@link ServiceManager}. |
| * |
| * @param delegate Service manager to delegate to. |
| * @return A wrapper. |
| */ |
| public static ServiceManagerIface serviceManager(final ServiceManager delegate) { |
| return new ServiceManagerIface() { |
| @Override |
| public ServiceManagerIface startAsync() { |
| delegate.startAsync(); |
| return this; |
| } |
| |
| @Override |
| public void awaitHealthy() { |
| delegate.awaitHealthy(); |
| } |
| |
| @Override |
| public ServiceManagerIface stopAsync() { |
| delegate.stopAsync(); |
| return this; |
| } |
| |
| @Override |
| public void awaitStopped(long timeout, TimeUnit unit) throws TimeoutException { |
| delegate.awaitStopped(timeout, unit); |
| } |
| |
| @Override |
| public ImmutableMultimap<State, Service> servicesByState() { |
| return delegate.servicesByState(); |
| } |
| }; |
| } |
| } |