1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 package org.apache.mina.common.support;
21
22 import java.util.ArrayList;
23 import java.util.List;
24
25 import org.apache.mina.common.IoFuture;
26 import org.apache.mina.common.IoFutureListener;
27 import org.apache.mina.common.IoSession;
28
29
30
31
32
33
34
35 public class DefaultIoFuture implements IoFuture {
36 private final IoSession session;
37
38 private final Object lock;
39
40 private IoFutureListener firstListener;
41
42 private List<IoFutureListener> otherListeners;
43
44 private Object result;
45
46 private boolean ready;
47
48
49
50
51
52
53 public DefaultIoFuture(IoSession session) {
54 this.session = session;
55 this.lock = this;
56 }
57
58 public IoSession getSession() {
59 return session;
60 }
61
62 public void join() {
63 synchronized (lock) {
64 while (!ready) {
65 try {
66 lock.wait();
67 } catch (InterruptedException e) {
68 }
69 }
70 }
71 }
72
73 public boolean join(long timeoutMillis) {
74 long startTime = (timeoutMillis <= 0) ? 0 : System.currentTimeMillis();
75 long waitTime = timeoutMillis;
76
77 synchronized (lock) {
78 if (ready) {
79 return ready;
80 } else if (waitTime <= 0) {
81 return ready;
82 }
83
84 for (;;) {
85 try {
86 lock.wait(waitTime);
87 } catch (InterruptedException e) {
88 }
89
90 if (ready) {
91 return true;
92 } else {
93 waitTime = timeoutMillis
94 - (System.currentTimeMillis() - startTime);
95 if (waitTime <= 0) {
96 return ready;
97 }
98 }
99 }
100 }
101 }
102
103 public boolean isReady() {
104 synchronized (lock) {
105 return ready;
106 }
107 }
108
109
110
111
112 protected void setValue(Object newValue) {
113 synchronized (lock) {
114
115 if (ready) {
116 return;
117 }
118
119 result = newValue;
120 ready = true;
121 lock.notifyAll();
122
123 notifyListeners();
124 }
125 }
126
127
128
129
130 protected Object getValue() {
131 synchronized (lock) {
132 return result;
133 }
134 }
135
136 public void addListener(IoFutureListener listener) {
137 if (listener == null) {
138 throw new NullPointerException("listener");
139 }
140
141 synchronized (lock) {
142 if (firstListener == null) {
143 firstListener = listener;
144 } else {
145 if (otherListeners == null) {
146 otherListeners = new ArrayList<IoFutureListener>(1);
147 }
148 otherListeners.add(listener);
149 }
150 if (ready) {
151 listener.operationComplete(this);
152 }
153 }
154 }
155
156 public void removeListener(IoFutureListener listener) {
157 if (listener == null) {
158 throw new NullPointerException("listener");
159 }
160
161 synchronized (lock) {
162 if (listener == firstListener) {
163 if (otherListeners != null && !otherListeners.isEmpty()) {
164 firstListener = otherListeners.remove(0);
165 } else {
166 firstListener = null;
167 }
168 } else if (otherListeners != null) {
169 otherListeners.remove(listener);
170 }
171 }
172 }
173
174 private void notifyListeners() {
175 synchronized (lock) {
176 if (firstListener != null) {
177 firstListener.operationComplete(this);
178 if (otherListeners != null) {
179 for (IoFutureListener l : otherListeners) {
180 l.operationComplete(this);
181 }
182 }
183 }
184 }
185 }
186 }