001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.runtime.common.driver.api;
020
021import org.apache.reef.util.BuilderUtils;
022
023/**
024 * Default POJO implementation of ResourceReleaseEvent.
025 * Use newBuilder to construct an instance.
026 */
027public final class ResourceReleaseEventImpl implements ResourceReleaseEvent {
028
029  private final String identifier;
030
031  private ResourceReleaseEventImpl(final Builder builder) {
032    this.identifier = BuilderUtils.notNull(builder.identifier);
033  }
034
035  @Override
036  public String getIdentifier() {
037    return identifier;
038  }
039
040  public static Builder newBuilder() {
041    return new Builder();
042  }
043
044  /**
045   * Builder used to create ResourceReleaseEvent instances.
046   */
047  public static final class Builder implements org.apache.reef.util.Builder<ResourceReleaseEvent> {
048
049    private String identifier;
050
051    /**
052     * @see ResourceReleaseEvent#getIdentifier()
053     */
054    public Builder setIdentifier(final String identifier) {
055      this.identifier = identifier;
056      return this;
057    }
058
059    @Override
060    public ResourceReleaseEvent build() {
061      return new ResourceReleaseEventImpl(this);
062    }
063  }
064}