Initial OpenECOMP Portal commit

[portal.git] / ecomp-portal-BE / src / main / java / org / openecomp / portalapp / portal / utils / ParallelExecutor.java

diff --git a/ecomp-portal-BE/src/main/java/org/openecomp/portalapp/portal/utils/ParallelExecutor.java b/ecomp-portal-BE/src/main/java/org/openecomp/portalapp/portal/utils/ParallelExecutor.java
new file mode 100644 (file)
index 0000000..19b3fc8
--- /dev/null
+++ b/ecomp-portal-BE/src/main/java/org/openecomp/portalapp/portal/utils/ParallelExecutor.java
@@ -0,0 +1,83 @@
+/*-
+ * ================================================================================
+ * eCOMP Portal
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property
+ * ================================================================================
+ * 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 org.openecomp.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.openecomp.portalsdk.core.logging.logic.EELFLoggerDelegate;
+
+public abstract class ParallelExecutor<T> {
+       
+       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, EcompPortalUtils.getStackTrace(e));
+                               }
+                       }
+                       executor.shutdown();
+               }
+               return result;
+       }
+
+}