/*
* Copyright © 2014 Cask Data, Inc.
*
* 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 co.cask.cdap.internal.app.runtime.distributed;
import co.cask.cdap.app.program.Program;
import org.apache.twill.api.TwillController;
/**
* For updating the number of service runnable instances.
*/
public class DistributedServiceRunnableInstanceUpdater {
private final Program program;
private final TwillController twillController;
DistributedServiceRunnableInstanceUpdater(Program program, TwillController twillController) {
this.program = program;
this.twillController = twillController;
}
void update(String runnableId, int newInstanceCount, int oldInstanceCount) throws Exception {
//TODO: Check if suspension of instances or wait till number of instances equal oldinstance count are required
twillController.changeInstances(runnableId, newInstanceCount).get();
}
}