|
132
|
1 /*******************************************************************************
|
|
|
2
|
|
|
3 copyright: Copyright (c) 2004 Kris Bell. All rights reserved
|
|
|
4
|
|
|
5 license: BSD style: $(LICENSE)
|
|
|
6
|
|
|
7 version: July 2004: Initial release
|
|
|
8
|
|
|
9 author: Kris
|
|
|
10
|
|
|
11 *******************************************************************************/
|
|
|
12
|
|
|
13 module tango.net.cluster.NetworkQueue;
|
|
|
14
|
|
|
15 private import tango.net.cluster.NetworkClient;
|
|
|
16
|
|
|
17 /*******************************************************************************
|
|
|
18
|
|
|
19 Exposes a gateway to the cluster queues, which collect ICached
|
|
|
20 objects until they are removed. Because there is a finite limit
|
|
|
21 to the quantity of entries stored, the put() method may throw a
|
|
|
22 ClusterFullException if it cannot add a new entry.
|
|
|
23
|
|
|
24 *******************************************************************************/
|
|
|
25
|
|
|
26 class NetworkQueue : NetworkClient, IConsumer
|
|
|
27 {
|
|
|
28 private IChannel reply;
|
|
|
29 private IConsumer consumer;
|
|
|
30
|
|
|
31 /***********************************************************************
|
|
|
32
|
|
|
33 Construct a NetworkMessage gateway on the provided QOS cluster
|
|
|
34 for the specified channel. Each subsequent queue operation
|
|
|
35 will take place over the given channel.
|
|
|
36
|
|
|
37 You can listen for cluster replies by providing an optional
|
|
|
38 ChannelListener. Outgoing messages will be tagged appropriately
|
|
|
39 such that a consumer can respond using IEvent.reply
|
|
|
40
|
|
|
41 ***********************************************************************/
|
|
|
42
|
|
|
43 this (ICluster cluster, char[] channel, ChannelListener listener = null)
|
|
|
44 {
|
|
|
45 super (cluster, channel);
|
|
|
46
|
|
|
47 if (listener)
|
|
|
48 {
|
|
|
49 reply = cluster.createChannel (channel ~ ".reply");
|
|
|
50 consumer = reply.createConsumer (listener);
|
|
|
51 }
|
|
|
52 }
|
|
|
53
|
|
|
54 /***********************************************************************
|
|
|
55
|
|
|
56 Add an IMessage entry to the corresponding queue. This
|
|
|
57 will throw a ClusterFullException if there is no space
|
|
|
58 left in the clustered queue.
|
|
|
59
|
|
|
60 ***********************************************************************/
|
|
|
61
|
|
|
62 void put (IMessage message)
|
|
|
63 {
|
|
|
64 assert (message);
|
|
|
65
|
|
|
66 if (reply)
|
|
|
67 message.reply = reply.name;
|
|
|
68
|
|
|
69 channel.putQueue (message);
|
|
|
70 }
|
|
|
71
|
|
|
72 /***********************************************************************
|
|
|
73
|
|
|
74 Query the cluster for queued entries on our corresponding
|
|
|
75 channel. Returns, and removes, a matching entry from the
|
|
|
76 cluster. This is the synchronous (polling) approach; you
|
|
|
77 should use createConsumer() instead for asynchronous style
|
|
|
78 notification instead.
|
|
|
79
|
|
|
80 ***********************************************************************/
|
|
|
81
|
|
|
82 IMessage get ()
|
|
|
83 {
|
|
|
84 return channel.getQueue;
|
|
|
85 }
|
|
|
86
|
|
|
87 /***********************************************************************
|
|
|
88
|
|
|
89 Cancel the listener. No more events will be dispatched to
|
|
|
90 the reply ChannelListener.
|
|
|
91
|
|
|
92 ***********************************************************************/
|
|
|
93
|
|
|
94 void cancel()
|
|
|
95 {
|
|
|
96 if (consumer)
|
|
|
97 consumer.cancel;
|
|
|
98 consumer = null;
|
|
|
99 }
|
|
|
100
|
|
|
101 /***********************************************************************
|
|
|
102
|
|
|
103 Create a listener for this channel. Listeners are invoked
|
|
|
104 when new content is placed into a corresponding queue.
|
|
|
105
|
|
|
106 ***********************************************************************/
|
|
|
107
|
|
|
108 IConsumer createConsumer (ChannelListener listener)
|
|
|
109 {
|
|
|
110 return channel.createConsumer (listener);
|
|
|
111 }
|
|
|
112 }
|
