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/*-
* ============LICENSE_START==========================================
* ONAP Portal
* ===================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ===================================================================
*
* Unless otherwise specified, all software contained herein is licensed
* under the Apache License, Version 2.0 (the "License");
* you may not use this software 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.
*
* Unless otherwise specified, all documentation contained herein is licensed
* under the Creative Commons License, Attribution 4.0 Intl. (the "License");
* you may not use this documentation except in compliance with the License.
* You may obtain a copy of the License at
*
* https://creativecommons.org/licenses/by/4.0/
*
* Unless required by applicable law or agreed to in writing, documentation
* 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.
*
* ============LICENSE_END============================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*/
package org.onap.portalapp.portal.utils;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import org.onap.portalsdk.core.logging.logic.EELFLoggerDelegate;
public abstract class ParallelExecutor<T> {
private EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(ParallelExecutor.class);
protected static abstract class ThreadOperation<T> {
public abstract T execute(List<Object> parms);
}
protected abstract ThreadOperation<T> getThreadOperation();
private static class CallableOperationThread<T> implements Callable<T> {
List<Object> parms;
private ThreadOperation<T> operation;
public CallableOperationThread(ThreadOperation<T> operation, List<Object> parms) {
this.parms = parms;
this.operation = operation;
}
@Override
public T call() throws Exception {
return this.operation.execute(this.parms);
}
}
public List<T> performAllOperations(int ThreadPoolSize, List<List<Object>> listOfParms) {
List<T> result = new ArrayList<T>();
if (ThreadPoolSize > 0 && listOfParms != null) {
ExecutorService executor = Executors.newFixedThreadPool(ThreadPoolSize);
List<Future<T>> list = new ArrayList<Future<T>>();
for (List<Object> parms : listOfParms) {
CallableOperationThread<T> getter = new CallableOperationThread<T>(this.getThreadOperation(), parms);
Future<T> submit = executor.submit(getter);
list.add(submit);
}
for (Future<T> future : list) {
try {
if (future != null) {
result.add(future.get());
}
} catch (Exception e) {
logger.error(EELFLoggerDelegate.errorLogger, "performAllOperations failed", e);
}
}
executor.shutdown();
}
return result;
}
}
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