common/src/main/java/org/apache/nemo/common/ir/vertex/utility/runtimepass/SignalVertex.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.nemo.common.ir.vertex.utility.runtimepass;

import org.apache.nemo.common.ir.IdManager;
import org.apache.nemo.common.ir.vertex.OperatorVertex;
import org.apache.nemo.common.ir.vertex.executionproperty.MessageIdVertexProperty;
import org.apache.nemo.common.ir.vertex.executionproperty.ParallelismProperty;
import org.apache.nemo.common.ir.vertex.transform.SignalTransform;


/**
 * Signal vertex holding signal transform.
 * It triggers runtime pass without examining related edge's data.
 */
public final class SignalVertex extends OperatorVertex {

  public SignalVertex() {
    super(new SignalTransform());
    this.setPropertyPermanently(MessageIdVertexProperty.of(IdManager.generateMessageId()));
    this.setPropertyPermanently(ParallelismProperty.of(1));
  }
}