1 files changed, 88 insertions, 0 deletions
diff --git a/qpid/java/broker/src/main/java/org/apache/qpid/server/flow/MessageOnlyCreditManager.java b/qpid/java/broker/src/main/java/org/apache/qpid/server/flow/MessageOnlyCreditManager.java
new file mode 100644
index 0000000000..a386f66b11
--- /dev/null
+++ b/qpid/java/broker/src/main/java/org/apache/qpid/server/flow/MessageOnlyCreditManager.java
@@ -0,0 +1,88 @@
+package org.apache.qpid.server.flow;
+
+import org.apache.qpid.server.message.ServerMessage;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+/*
+*
+* 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.
+*
+*/
+public class MessageOnlyCreditManager extends AbstractFlowCreditManager implements FlowCreditManager
+{
+    private final AtomicLong _messageCredit;
+
+    public MessageOnlyCreditManager(final long initialCredit)
+    {
+        _messageCredit = new AtomicLong(initialCredit);
+    }
+
+    public long getMessageCredit()
+    {
+        return _messageCredit.get();
+    }
+
+    public long getBytesCredit()
+    {
+        return -1L;
+    }
+
+    public void restoreCredit(long messageCredit, long bytesCredit)
+    {
+        _messageCredit.addAndGet(messageCredit);
+        setSuspended(false);
+
+    }
+
+    public void removeAllCredit()
+    {
+        setSuspended(true);
+        _messageCredit.set(0L);
+    }
+
+    public boolean hasCredit()
+    {
+        return _messageCredit.get() > 0L;
+    }
+
+    public boolean useCreditForMessage(ServerMessage msg)
+    {
+        if(hasCredit())
+        {
+            if(_messageCredit.addAndGet(-1L) >= 0)
+            {
+                setSuspended(false);
+                return true;
+            }
+            else
+            {
+                _messageCredit.addAndGet(1L);
+                setSuspended(true);
+                return false;
+            }
+        }
+        else
+        {
+            setSuspended(true);
+            return false;
+        }
+                
+    }
+
+}