/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.nephele.instance;
/**
* A DummyInstance is a stub implementation of the {@link AbstractInstance} interface.
* Dummy instances are used to plan a job execution but must be replaced with
* concrete instances before the job execution starts.
*
*/
public class DummyInstance extends AbstractInstance {
private static int nextID = 0;
private final String name;
public static synchronized DummyInstance createDummyInstance(InstanceType type) {
return new DummyInstance(type, nextID++);
}
/**
* Constructs a new dummy instance of the given instance type.
*
* @param type
* the type of the new dummy instance
* @param id
* the ID of the dummy instance
*/
private DummyInstance(InstanceType type, int id) {
super(type, null, null, null, null);
this.name = "DummyInstance_" + Integer.toString(id);
}
@Override
public String toString() {
return this.name;
}
@Override
public HardwareDescription getHardwareDescription() {
throw new RuntimeException("getHardwareDescription is called on a DummyInstance");
}
}