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;
+	}
+
+}