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1 /* ====================================================================
2 * License:
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
14 * distribution.
15 *
16 * 3. The end-user documentation included with the redistribution,
17 * if any, must include the following acknowledgment:
18 * "This product includes software developed by
19 * Robert Half International (http://www.rhi.com/)."
20 * Alternately, this acknowledgment may appear in the software itself,
21 * if and wherever such third-party acknowledgments normally appear.
22 *
23 * 4. The names "Parc", "RHI", and "Robert Half International" must
24 * not be used to endorse or promote products derived from this
25 * software without prior written permission. For written
26 * permission, please contact pete.mckinstry@rhi.com.
27 *
28 * 5. Products derived from this software may not be called "PARC",
29 * nor may "PARC" appear in their name, without prior written
30 * permission of Robert Half International.
31 *
32 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
33 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
34 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
35 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
36 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
37 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
38 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
39 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
40 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
41 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
42 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 * SUCH DAMAGE.
44 * ====================================================================
45 *
46 */
47 package com.rhi.architecture.parc.channel;
48
49 import com.rhi.architecture.logging.LogUtil;
50 import com.rhi.architecture.logging.Logger;
51 import com.rhi.architecture.parc.Channel;
52 import com.rhi.architecture.parc.Monitor;
53 import com.rhi.architecture.config.ConfigurationException;
54
55 import java.util.HashSet;
56 import java.util.Iterator;
57
58 /***
59 * Abstract Channel
60 *
61 * @author <a href="mailto:pete.mckinstry@rhi.com">Pete McKinstry</a>
62 * @copyright 2002, Robert Half Int'l. All rights reserved.
63 *
64 * @version 1.0
65 */
66 public abstract class AbstractChannel implements Channel {
67
68 private HashSet monitors = new HashSet();
69 private static Logger log = null;
70
71 static {
72 try {
73 log = LogUtil.getLogger();
74 }
75 catch (ConfigurationException e) {
76 // ignore
77 }
78 }
79
80 /***
81 * Constructor for AbstractChannel.
82 */
83 public AbstractChannel() {
84 super();
85 }
86
87 /***
88 * This should be overriden by sub-classes but compilation is complicated
89 * due to the use of clone() w/o a throws CloneNotSupported exception. This
90 * method is provided mostly just to satisfy the compile.
91 *
92 * @return Object
93 *
94 * @since 1.0
95 */
96 public Object clone() {
97 Object o = null;
98 try {
99 o = super.clone();
100 }
101 catch (CloneNotSupportedException cnse) {
102 // impossible.
103 }
104 return o;
105 }
106
107 /***
108 * Method notifyListeners.
109 */
110 protected void notifyMonitors() {
111 synchronized (monitors) {
112 Iterator iter = monitors.iterator();
113 while (iter.hasNext()) {
114 Monitor m = (Monitor) iter.next();
115 log("notifying monitor = " + m);
116 m.notify(ChannelEvent.NEW_RECORDS);
117 }
118 }
119 }
120
121 /***
122 * @param m
123 * @see com.rhi.architecture.parc.Supplier#registerMonitor(com.rhi.architecture.parc.Monitor)
124 */
125 public void registerMonitor(Monitor m) {
126 log("registering channel monitor = " + m);
127 synchronized (monitors) {
128 monitors.add(m);
129 }
130 }
131
132 /***
133 * log msg
134 * @param msg
135 */
136 public void log(String msg) {
137 if (log != null) {
138 log.debug(msg);
139 }
140 }
141
142 }
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