hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/preprocessor/TagAddProcessor.java

/**
 * 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.hadoop.yarn.server.resourcemanager.preprocessor;

import java.util.HashSet;
import java.util.Set;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;



/**
 * This processor will add the tag to application submission context.
 */
class TagAddProcessor implements ContextProcessor {
  @Override
  public void process(String host, String value, ApplicationId applicationId,
      ApplicationSubmissionContext submissionContext) {
    Set<String> applicationTags = submissionContext.getApplicationTags();
    if (applicationTags == null) {
      applicationTags = new HashSet<>();
    } else {
      applicationTags = new HashSet<>(applicationTags);
    }
    applicationTags.add(value);
    submissionContext.setApplicationTags(applicationTags);
  }
}