diff options
Diffstat (limited to 'ecomp-portal-BE-common/src/main/java/org/onap/portalapp/portal/utils/ParallelExecutor.java')
-rw-r--r-- | ecomp-portal-BE-common/src/main/java/org/onap/portalapp/portal/utils/ParallelExecutor.java | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/ecomp-portal-BE-common/src/main/java/org/onap/portalapp/portal/utils/ParallelExecutor.java b/ecomp-portal-BE-common/src/main/java/org/onap/portalapp/portal/utils/ParallelExecutor.java new file mode 100644 index 00000000..b4ad9c9f --- /dev/null +++ b/ecomp-portal-BE-common/src/main/java/org/onap/portalapp/portal/utils/ParallelExecutor.java @@ -0,0 +1,101 @@ +/*- + * ============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; + } + +} |