1 files changed, 98 insertions, 0 deletions
diff --git a/appc-client/client-lib/src/main/java/org/onap/appc/client/impl/core/TaskQueueManager.java b/appc-client/client-lib/src/main/java/org/onap/appc/client/impl/core/TaskQueueManager.java
new file mode 100644
index 000000000..b87349411
--- /dev/null
+++ b/appc-client/client-lib/src/main/java/org/onap/appc/client/impl/core/TaskQueueManager.java
@@ -0,0 +1,98 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP : APPC
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Copyright (C) 2017 Amdocs
+ * =============================================================================
+ * 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.
+ * 
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.appc.client.impl.core;
+
+import com.att.eelf.configuration.EELFLogger;
+import com.att.eelf.configuration.EELFManager;
+
+import java.util.List;
+import java.util.Properties;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+/** Creates a task queue pool that reuses a fixed number of threads.
+ * Assigns one thread for each queue.
+ */
+class TaskQueueManager {
+    private final EELFLogger LOG = EELFManager.getInstance().getLogger(TaskQueueManager.class);
+    private ExecutorService executorService;
+    private final static String DEFAULT_POOL_SIZE = "10";
+    private final static String CLIENT_POOL_SIZE = "client.pool.size";
+    private TaskQueue[] queues;
+    private int poolInt;
+
+    TaskQueueManager(Properties properties){
+        String size = properties.getProperty(CLIENT_POOL_SIZE, DEFAULT_POOL_SIZE);
+        poolInt = Integer.parseInt(size);
+        this.executorService = Executors.newFixedThreadPool(poolInt);
+        initTaskQueues();
+    }
+
+    private void initTaskQueues(){
+        queues = new TaskQueue[poolInt];
+        for(int i=0; i<poolInt; i++){
+            queues[i] = new TaskQueue();
+            this.executorService.submit(queues[i]);
+        }
+    }
+
+    void submit(String corrID, Runnable task) throws InterruptedException {
+        TaskQueue queue = getTaskQueue(corrID);
+        queue.addTask(task);
+    }
+
+    /**
+     * ensures synchronous handling all responses and timeout belongs to same correlation ID
+     * @param corrID
+     * @return - @{@link TaskQueue}
+     */
+    private TaskQueue getTaskQueue(String corrID){
+        int index = Math.abs(corrID.hashCode()) % poolInt;
+        return queues[index];
+    }
+
+    /**
+     * goes over queues for stopping threads
+     * @throws InterruptedException
+     */
+    void stopQueueManager() throws InterruptedException {
+        for(int i=0; i<poolInt; i++){
+            queues[i].stopQueue();
+            queues[i].addTask(new Runnable() {
+                @Override
+                public void run() {
+                    /**
+                     * wake up the queue for stopping thread
+                     */
+                }
+            });
+        }
+        List<Runnable> listTask = executorService.shutdownNow();
+        if (!executorService.awaitTermination(6, TimeUnit.SECONDS))
+            System.err.println("Pool did not terminate");
+        LOG.info("the amount of tasks that never commenced execution " + listTask.size());
+    }
+}