Added asynchronous scheduler for flushes and merges.
diff --git a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/AsynchronousScheduler.java b/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/AsynchronousScheduler.java
new file mode 100644
index 0000000..ba5b8c6
--- /dev/null
+++ b/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/AsynchronousScheduler.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.storage.am.lsm.common.impls;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.ThreadFactory;
+
+import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
+import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperation;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
+
+public class AsynchronousScheduler implements ILSMIOOperationScheduler {
+ public final static AsynchronousScheduler INSTANCE = new AsynchronousScheduler();
+
+ private OperationPerformerThread operationPerformerThread;
+
+ private AsynchronousScheduler() {
+ operationPerformerThread = new OperationPerformerThread();
+ operationPerformerThread.setDaemon(true);
+ }
+
+ public void init(ThreadFactory threadFactory) {
+ Executor executor = Executors.newCachedThreadPool(threadFactory);
+ executor.execute(operationPerformerThread);
+ }
+
+ @Override
+ public void scheduleOperation(ILSMIOOperation operation) throws HyracksDataException {
+ operationPerformerThread.perform(operation);
+ }
+}
+
+class OperationPerformerThread extends Thread {
+
+ private final LinkedBlockingQueue<ILSMIOOperation> operationsQueue = new LinkedBlockingQueue<ILSMIOOperation>();
+
+ public void perform(ILSMIOOperation operation) {
+ operationsQueue.offer(operation);
+ }
+
+ @Override
+ public void run() {
+ while (true) {
+ ILSMIOOperation operation;
+ try {
+ operation = operationsQueue.take();
+ } catch (InterruptedException e) {
+ break;
+ }
+ try {
+ operation.perform();
+ } catch (HyracksDataException | IndexException e) {
+ throw new RuntimeException(e);
+ }
+ }
+ }
+
+}
+