1 files changed, 65 insertions, 0 deletions
diff --git a/qpid/tools/src/java/qpid-qmf2/src/main/java/org/apache/qpid/qmf2/common/BlockingNotifier.java b/qpid/tools/src/java/qpid-qmf2/src/main/java/org/apache/qpid/qmf2/common/BlockingNotifier.java
new file mode 100644
index 0000000000..634a5e60b0
--- /dev/null
+++ b/qpid/tools/src/java/qpid-qmf2/src/main/java/org/apache/qpid/qmf2/common/BlockingNotifier.java
@@ -0,0 +1,65 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.qpid.qmf2.common;
+
+/**
+ * Implementation of the Notifier Interface that provides a waitForWorkItem() method which blocks until the
+ * Console has called the indication() method indicating that there are WorkItems available.
+ * <p>
+ * This class isn't part of the QMF2 API however it's almost certainly how most clients would choose to use the
+ * Notifier API so it seems useful to provide an implementation.
+ * 
+ * @author Fraser Adams
+ */
+public final class BlockingNotifier implements Notifier
+{
+    private boolean _waiting = true;
+
+    /**
+     * This method blocks until the indication() method has been called, this is generally called by the Console
+     * when new WorkItems are made available.
+     */
+    public synchronized void waitForWorkItem()
+    {
+        while (_waiting)
+        {
+            try
+            {
+                wait();
+            }
+            catch (InterruptedException ie)
+            {
+                continue;
+            }
+        }
+        _waiting = true;
+    }
+
+    /**
+     * Called to indicate the availability of WorkItems. This method unblocks waitForWorkItem()
+     */
+    public synchronized void indication()
+    {
+        _waiting = false;
+        notifyAll();
+    }
+}
+