|
|||||||||||||||||||
30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
SynchornizedSynchChannel.java | 0% | 0% | 0% | 0% |
|
1 |
/**
|
|
2 |
*
|
|
3 |
* Copyright 2004 Hiram Chirino
|
|
4 |
*
|
|
5 |
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
6 |
* you may not use this file except in compliance with the License.
|
|
7 |
* You may obtain a copy of the License at
|
|
8 |
*
|
|
9 |
* http://www.apache.org/licenses/LICENSE-2.0
|
|
10 |
*
|
|
11 |
* Unless required by applicable law or agreed to in writing, software
|
|
12 |
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
13 |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
14 |
* See the License for the specific language governing permissions and
|
|
15 |
* limitations under the License.
|
|
16 |
*/
|
|
17 |
package org.activeio.filter;
|
|
18 |
|
|
19 |
import java.io.IOException;
|
|
20 |
import java.io.InterruptedIOException;
|
|
21 |
|
|
22 |
import org.activeio.FilterSynchChannel;
|
|
23 |
import org.activeio.Packet;
|
|
24 |
import org.activeio.SynchChannel;
|
|
25 |
import org.activeio.SynchChannelServer;
|
|
26 |
|
|
27 |
import EDU.oswego.cs.dl.util.concurrent.Mutex;
|
|
28 |
import EDU.oswego.cs.dl.util.concurrent.Sync;
|
|
29 |
|
|
30 |
/**
|
|
31 |
* Used to synchronize concurrent access to a SynchChannel.
|
|
32 |
*
|
|
33 |
* Uses two different {@see EDU.oswego.cs.dl.util.concurrent.Sync} objects
|
|
34 |
* for write and read operations. All other operations such as {@see #stop(long)}
|
|
35 |
* and {@see #stop} just do a normal java synchronization against the SynchornizedSynchChannel
|
|
36 |
* object instance.
|
|
37 |
*
|
|
38 |
*/
|
|
39 |
public class SynchornizedSynchChannel extends FilterSynchChannel { |
|
40 |
|
|
41 |
private final Sync readLock;
|
|
42 |
private final Sync writeLock;
|
|
43 |
|
|
44 | 0 |
public SynchornizedSynchChannel(SynchChannel next) {
|
45 | 0 |
this(next, new Mutex(), new Mutex()); |
46 |
} |
|
47 |
|
|
48 | 0 |
public SynchornizedSynchChannel(SynchChannel next, Sync readLock, Sync writeLock) {
|
49 | 0 |
super(next);
|
50 | 0 |
this.readLock = readLock;
|
51 | 0 |
this.writeLock = writeLock;
|
52 |
} |
|
53 |
|
|
54 | 0 |
public Packet read(long timeout) throws IOException { |
55 | 0 |
try {
|
56 |
|
|
57 | 0 |
if( timeout==SynchChannelServer.WAIT_FOREVER_TIMEOUT ) {
|
58 | 0 |
readLock.acquire(); |
59 |
} else {
|
|
60 | 0 |
long start = System.currentTimeMillis();
|
61 | 0 |
if( !readLock.attempt(0) ) {
|
62 | 0 |
return null; |
63 |
} |
|
64 |
// Adjust the resulting timeout down to account for time taken to
|
|
65 |
// get the readLock.
|
|
66 | 0 |
timeout = Math.max(0, timeout-(System.currentTimeMillis()-start)); |
67 |
} |
|
68 |
|
|
69 |
} catch (InterruptedException e) {
|
|
70 | 0 |
throw new InterruptedIOException(e.getMessage()); |
71 |
} |
|
72 |
|
|
73 | 0 |
try {
|
74 | 0 |
return getNext().read(timeout);
|
75 |
} finally {
|
|
76 | 0 |
readLock.release(); |
77 |
} |
|
78 |
} |
|
79 |
|
|
80 | 0 |
public void write(Packet packet) throws IOException { |
81 | 0 |
try {
|
82 | 0 |
writeLock.acquire(); |
83 |
} catch (InterruptedException e) {
|
|
84 | 0 |
throw new InterruptedIOException(e.getMessage()); |
85 |
} |
|
86 | 0 |
try {
|
87 | 0 |
getNext().write(packet); |
88 |
} finally {
|
|
89 | 0 |
writeLock.release(); |
90 |
} |
|
91 |
} |
|
92 |
|
|
93 | 0 |
public void flush() throws IOException { |
94 | 0 |
try {
|
95 | 0 |
writeLock.acquire(); |
96 |
} catch (InterruptedException e) {
|
|
97 | 0 |
throw new InterruptedIOException(e.getMessage()); |
98 |
} |
|
99 | 0 |
try {
|
100 | 0 |
getNext().flush(); |
101 |
} finally {
|
|
102 | 0 |
writeLock.release(); |
103 |
} |
|
104 |
} |
|
105 |
|
|
106 | 0 |
synchronized public void dispose() { |
107 | 0 |
super.dispose();
|
108 |
} |
|
109 |
|
|
110 | 0 |
synchronized public Object narrow(Class target) { |
111 | 0 |
return super.narrow(target); |
112 |
} |
|
113 |
|
|
114 | 0 |
synchronized public void start() throws IOException { |
115 | 0 |
super.start();
|
116 |
} |
|
117 |
|
|
118 | 0 |
synchronized public void stop(long timeout) throws IOException { |
119 | 0 |
super.stop(timeout);
|
120 |
} |
|
121 |
|
|
122 | 0 |
public Sync getReadLock() {
|
123 | 0 |
return readLock;
|
124 |
} |
|
125 |
|
|
126 | 0 |
public Sync getWriteLock() {
|
127 | 0 |
return writeLock;
|
128 |
} |
|
129 |
} |
|
130 |
|
|