1 files changed, 39 insertions, 0 deletions
diff --git a/qpid/java/broker-core/src/main/java/org/apache/qpid/server/queue/MessageGroupManager.java b/qpid/java/broker-core/src/main/java/org/apache/qpid/server/queue/MessageGroupManager.java
new file mode 100644
index 0000000000..ba9dbc8a70
--- /dev/null
+++ b/qpid/java/broker-core/src/main/java/org/apache/qpid/server/queue/MessageGroupManager.java
@@ -0,0 +1,39 @@
+/*
+ *
+ * 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.server.queue;
+
+public interface MessageGroupManager<E extends QueueEntryImpl<E,Q,L>, Q extends SimpleAMQQueue<E,Q,L>, L extends SimpleQueueEntryList<E,Q,L>>
+{
+    public interface ConsumerResetHelper<E extends QueueEntryImpl<E,Q,L>, Q extends SimpleAMQQueue<E,Q,L>, L extends SimpleQueueEntryList<E,Q,L>>
+    {
+        public void resetSubPointersForGroups(QueueConsumer<?,E,Q,L> consumer, boolean clearAssignments);
+
+        boolean isEntryAheadOfConsumer(E entry, QueueConsumer<?,E,Q,L> sub);
+    }
+
+    QueueConsumer getAssignedConsumer(E entry);
+
+    boolean acceptMessage(QueueConsumer<?,E,Q,L> sub, E entry);
+
+    E findEarliestAssignedAvailableEntry(QueueConsumer<?,E,Q,L> sub);
+
+    void clearAssignments(QueueConsumer sub);
+}