| /* |
| * 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.reef.runtime.yarn.driver; |
| |
| |
| import org.apache.hadoop.yarn.api.records.Container; |
| import org.apache.reef.annotations.audience.DriverSide; |
| import org.apache.reef.annotations.audience.Private; |
| import org.apache.reef.util.Optional; |
| |
| import javax.inject.Inject; |
| import java.util.ArrayList; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * Helper class that manages the set of Containers we know about. |
| */ |
| @Private |
| @DriverSide |
| final class Containers { |
| private final Map<String, Container> containers = new ConcurrentHashMap<>(); |
| |
| @Inject |
| Containers() { |
| } |
| |
| /** |
| * @param containerID |
| * @return the container for the given id. |
| * @throws java.lang.RuntimeException when the container is unknown. |
| */ |
| synchronized Container get(final String containerID) { |
| final Container result = this.containers.get(containerID); |
| if (null == result) { |
| throw new RuntimeException("Requesting an unknown container: " + containerID); |
| } |
| return result; |
| } |
| |
| /** |
| * Registers the given container. |
| * |
| * @param container |
| * @throws java.lang.RuntimeException if a container with the same ID had been registered before. |
| */ |
| synchronized void add(final Container container) { |
| final String containerId = container.getId().toString(); |
| if (this.hasContainer(containerId)) { |
| throw new RuntimeException("Trying to add a Container that is already known: " + containerId); |
| } |
| this.containers.put(containerId, container); |
| } |
| |
| /** |
| * Removes the container with the given ID. |
| * |
| * @param containerId |
| * @return the container that was registered before. |
| * @throws java.lang.RuntimeException if no such container existed. |
| */ |
| synchronized Container removeAndGet(final String containerId) { |
| final Container result = this.containers.remove(containerId); |
| if (null == result) { |
| throw new RuntimeException("Unknown container to remove: " + containerId); |
| } |
| return result; |
| } |
| |
| /** |
| * @param containerId |
| * @return true, if a container with this ID is known. |
| */ |
| synchronized boolean hasContainer(final String containerId) { |
| return this.containers.containsKey(containerId); |
| } |
| |
| |
| /** |
| * @param containerId |
| * @return the Container stored under this containerId or an empty Optional. |
| */ |
| synchronized Optional<Container> getOptional(final String containerId) { |
| return Optional.ofNullable(this.containers.get(containerId)); |
| } |
| |
| /** |
| * @return an Iterable of all the known container Ids. |
| */ |
| synchronized Iterable<String> getContainerIds() { |
| return new ArrayList<>(this.containers.keySet()); |
| } |
| } |