01 /*
02 *
03 * Licensed to the Apache Software Foundation (ASF) under one
04 * or more contributor license agreements. See the NOTICE file
05 * distributed with this work for additional information
06 * regarding copyright ownership. The ASF licenses this file
07 * to you under the Apache License, Version 2.0 (the
08 * "License"); you may not use this file except in compliance
09 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 *
20 */
21 package org.apache.qpid.server.subscription;
22
23 import org.apache.qpid.AMQException;
24 import org.apache.qpid.framing.AMQShortString;
25 import org.apache.qpid.server.AMQChannel;
26 import org.apache.qpid.server.queue.AMQQueue;
27 import org.apache.qpid.server.queue.QueueEntry;
28
29 public interface Subscription
30 {
31
32
33 public static enum State
34 {
35 ACTIVE,
36 SUSPENDED,
37 CLOSED
38 }
39
40 public static interface StateListener
41 {
42 public void stateChange(Subscription sub, State oldState, State newState);
43 }
44
45 AMQQueue getQueue();
46
47 QueueEntry.SubscriptionAcquiredState getOwningState();
48
49 void setQueue(AMQQueue queue);
50
51 AMQChannel getChannel();
52
53 AMQShortString getConsumerTag();
54
55 boolean isSuspended();
56
57 boolean hasInterest(QueueEntry msg);
58
59 boolean isAutoClose();
60
61 boolean isClosed();
62
63 boolean isBrowser();
64
65 void close();
66
67 boolean filtersMessages();
68
69 void send(QueueEntry msg) throws AMQException;
70
71 void queueDeleted(AMQQueue queue);
72
73
74 boolean wouldSuspend(QueueEntry msg);
75
76 void getSendLock();
77 void releaseSendLock();
78
79 void resend(final QueueEntry entry) throws AMQException;
80
81 void restoreCredit(final QueueEntry queueEntry);
82
83 void setStateListener(final StateListener listener);
84
85 public State getState();
86
87 QueueEntry getLastSeenEntry();
88
89 boolean setLastSeenEntry(QueueEntry expected, QueueEntry newValue);
90
91
92 boolean isActive();
93
94
95
96 }
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