因此，我试图为一个类做这个项目，在该类中，我使用套接字模拟分布式计算机网络。然后，每台计算机将编写一个包含其ID和时间戳的事件对象，并且每台计算机还将读取传入的事件对象，并比较其自己的时间戳和发送的时间戳。
我以为我一切正常，直到查看日志，似乎有些奇怪。我注意到，即使它应该接收其他计算机生成的新事件，该计算机仍在不断读取同一对象。
这是用于生成事件并将事件写入套接字的代码
private void generateEvents(Random rand, int numOfEvents) throws IOException {
int temp;
while (eventCount < numOfEvents) {
int choice = rand.nextInt(5);
synchronized (timestamp) {
if (choice == 0) {
temp = timestamp.get(identifier);
++temp;
timestamp.set(identifier, temp);
log.write(eventCount + ": " + "Sent to myself. " + timestamp.toString());
} else {
int randC = rand.nextInt(outputClients.size());
ClientSocket cc = outputClients.get(randC);
Event sentEvent = new Event(identifier, timestamp);
log.write(sentEvent.from + " " + sentEvent.timestamp);
cc.out.writeObject(sentEvent);
log.write(eventCount + ": " + "Sent to " + randC + ": " + timestamp.toString());
}
}
eventCount++;
// Add sleep for breathing room
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
此代码由主计算机线程运行。
这是读取对象的代码
while (isAlive) {
Event event;
try {
event = (Event) in.readObject();
if (event != null) {
log.write("Reading from " + event.from + ": " + event.timestamp.toString());
log.write("Old timestamp: " + timestamp.toString());
synchronized (timestamp) {
int temp;
for (int i = 0; i < timestamp.size(); ++i) {
if (event.getTimestamp().get(i) > timestamp.get(i)) {
timestamp.set(i, event.getTimestamp().get(i));
}
}
temp = timestamp.get(event.getFromID());
++temp;
timestamp.set(event.getFromID(), temp);
}
log.write("Updated timestamp: " + timestamp.toString());
}
} catch (ClassNotFoundException e) {
// Do nothing
} catch (EOFException e) {
// Do nothing
}
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
此代码由Computer类创建的单独线程运行。
您可以在此处查看我的完整代码：https://github.com/nollidnosnhoj/time-table-exchange
因此，当我运行程序时，我开始看到方便的模式：
Computer is starting!
[0, 0, 0, 0, 0]
Connecting to other computers in network
Connected to computers. Start reading and writing events
0 [0, 0, 0, 0, 0]
0: Sent to 2: [0, 0, 0, 0, 0]
0 [0, 0, 0, 0, 0]
1: Sent to 2: [0, 0, 0, 0, 0]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [0, 0, 0, 0, 0]
Updated timestamp: [0, 0, 0, 0, 1]
0 [0, 0, 0, 0, 1]
2: Sent to 2: [0, 0, 0, 0, 1]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [0, 0, 0, 0, 1]
Updated timestamp: [0, 1, 1, 0, 1]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [0, 1, 1, 0, 1]
Updated timestamp: [1, 1, 1, 3, 1]
0 [1, 1, 1, 3, 1]
3: Sent to 1: [1, 1, 1, 3, 1]
0 [1, 1, 1, 3, 1]
4: Sent to 2: [1, 1, 1, 3, 1]
0 [1, 1, 1, 3, 1]
5: Sent to 3: [1, 1, 1, 3, 1]
0 [1, 1, 1, 3, 1]
6: Sent to 3: [1, 1, 1, 3, 1]
0 [1, 1, 1, 3, 1]
7: Sent to 1: [1, 1, 1, 3, 1]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [1, 1, 1, 3, 1]
Updated timestamp: [1, 1, 1, 3, 2]
0 [1, 1, 1, 3, 2]
8: Sent to 2: [1, 1, 1, 3, 2]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [1, 1, 1, 3, 2]
Updated timestamp: [1, 2, 1, 3, 2]
0 [1, 2, 1, 3, 2]
9: Sent to 1: [1, 2, 1, 3, 2]
10: Sent to myself. [2, 2, 1, 3, 2]
11: Sent to myself. [3, 2, 1, 3, 2]
0 [3, 2, 1, 3, 2]
12: Sent to 2: [3, 2, 1, 3, 2]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [3, 2, 1, 3, 2]
Updated timestamp: [3, 4, 4, 5, 2]
0 [3, 4, 4, 5, 2]
13: Sent to 2: [3, 4, 4, 5, 2]
14: Sent to myself. [4, 4, 4, 5, 2]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [4, 4, 4, 5, 2]
Updated timestamp: [4, 4, 4, 5, 3]
0 [4, 4, 4, 5, 3]
15: Sent to 1: [4, 4, 4, 5, 3]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [4, 4, 4, 5, 3]
Updated timestamp: [4, 5, 4, 5, 3]
0 [4, 5, 4, 5, 3]
16: Sent to 3: [4, 5, 4, 5, 3]
0 [4, 5, 4, 5, 3]
17: Sent to 0: [4, 5, 4, 5, 3]
0 [4, 5, 4, 5, 3]
18: Sent to 1: [4, 5, 4, 5, 3]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [4, 5, 4, 5, 3]
Updated timestamp: [4, 5, 5, 5, 3]
0 [4, 5, 5, 5, 3]
19: Sent to 3: [4, 5, 5, 5, 3]
20: Sent to myself. [5, 5, 5, 5, 3]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [5, 5, 5, 5, 3]
Updated timestamp: [5, 5, 5, 6, 3]
0 [5, 5, 5, 6, 3]
21: Sent to 2: [5, 5, 5, 6, 3]
0 [5, 5, 5, 6, 3]
22: Sent to 1: [5, 5, 5, 6, 3]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [5, 5, 5, 6, 3]
Updated timestamp: [5, 5, 5, 6, 4]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [5, 5, 5, 6, 4]
Updated timestamp: [5, 6, 5, 6, 4]
23: Sent to myself. [6, 6, 5, 6, 4]
0 [6, 6, 5, 6, 4]
24: Sent to 3: [6, 6, 5, 6, 4]
0 [6, 6, 5, 6, 4]
25: Sent to 3: [6, 6, 5, 6, 4]
0 [6, 6, 5, 6, 4]
26: Sent to 3: [6, 6, 5, 6, 4]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [6, 6, 5, 6, 4]
Updated timestamp: [6, 6, 6, 6, 4]
0 [6, 6, 6, 6, 4]
27: Sent to 1: [6, 6, 6, 6, 4]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [6, 6, 6, 6, 4]
Updated timestamp: [6, 6, 6, 7, 4]
0 [6, 6, 6, 7, 4]
28: Sent to 1: [6, 6, 6, 7, 4]
0 [6, 6, 6, 7, 4]
29: Sent to 2: [6, 6, 6, 7, 4]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [6, 6, 6, 7, 4]
Updated timestamp: [6, 6, 6, 7, 5]
0 [6, 6, 6, 7, 5]
30: Sent to 2: [6, 6, 6, 7, 5]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [6, 6, 6, 7, 5]
Updated timestamp: [6, 7, 6, 7, 5]
0 [6, 7, 6, 7, 5]
31: Sent to 1: [6, 7, 6, 7, 5]
32: Sent to myself. [7, 7, 6, 7, 5]
0 [7, 7, 6, 7, 5]
33: Sent to 0: [7, 7, 6, 7, 5]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [7, 7, 6, 7, 5]
Updated timestamp: [7, 7, 7, 7, 5]
0 [7, 7, 7, 7, 5]
34: Sent to 1: [7, 7, 7, 7, 5]
0 [7, 7, 7, 7, 5]
35: Sent to 1: [7, 7, 7, 7, 5]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [7, 7, 7, 7, 5]
Updated timestamp: [7, 7, 7, 8, 5]
0 [7, 7, 7, 8, 5]
36: Sent to 1: [7, 7, 7, 8, 5]
0 [7, 7, 7, 8, 5]
37: Sent to 1: [7, 7, 7, 8, 5]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [7, 7, 7, 8, 5]
Updated timestamp: [7, 7, 7, 8, 6]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [7, 7, 7, 8, 6]
Updated timestamp: [7, 8, 7, 8, 6]
0 [7, 8, 7, 8, 6]
38: Sent to 0: [7, 8, 7, 8, 6]
0 [7, 8, 7, 8, 6]
39: Sent to 2: [7, 8, 7, 8, 6]
0 [7, 8, 7, 8, 6]
40: Sent to 3: [7, 8, 7, 8, 6]
0 [7, 8, 7, 8, 6]
41: Sent to 3: [7, 8, 7, 8, 6]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [7, 8, 7, 8, 6]
Updated timestamp: [7, 8, 8, 8, 6]
42: Sent to myself. [8, 8, 8, 8, 6]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [8, 8, 8, 8, 6]
Updated timestamp: [8, 8, 8, 9, 6]
0 [8, 8, 8, 9, 6]
43: Sent to 3: [8, 8, 8, 9, 6]
0 [8, 8, 8, 9, 6]
44: Sent to 2: [8, 8, 8, 9, 6]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [8, 8, 8, 9, 6]
Updated timestamp: [8, 8, 8, 9, 7]
0 [8, 8, 8, 9, 7]
45: Sent to 0: [8, 8, 8, 9, 7]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [8, 8, 8, 9, 7]
Updated timestamp: [8, 9, 8, 9, 7]
0 [8, 9, 8, 9, 7]
46: Sent to 3: [8, 9, 8, 9, 7]
47: Sent to myself. [9, 9, 8, 9, 7]
0 [9, 9, 8, 9, 7]
48: Sent to 3: [9, 9, 8, 9, 7]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [9, 9, 8, 9, 7]
Updated timestamp: [9, 9, 9, 9, 7]
0 [9, 9, 9, 9, 7]
49: Sent to 0: [9, 9, 9, 9, 7]
0 [9, 9, 9, 9, 7]
50: Sent to 0: [9, 9, 9, 9, 7]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [9, 9, 9, 9, 7]
Updated timestamp: [9, 9, 9, 10, 7]
51: Sent to myself. [10, 9, 9, 10, 7]
0 [10, 9, 9, 10, 7]
52: Sent to 2: [10, 9, 9, 10, 7]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [10, 9, 9, 10, 7]
Updated timestamp: [10, 9, 9, 10, 8]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [10, 9, 9, 10, 8]
Updated timestamp: [10, 10, 9, 10, 8]
53: Sent to myself. [11, 10, 9, 10, 8]
0 [11, 10, 9, 10, 8]
54: Sent to 3: [11, 10, 9, 10, 8]
0 [11, 10, 9, 10, 8]
55: Sent to 1: [11, 10, 9, 10, 8]
56: Sent to myself. [12, 10, 9, 10, 8]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [12, 10, 9, 10, 8]
Updated timestamp: [12, 10, 10, 10, 8]
0 [12, 10, 10, 10, 8]
57: Sent to 1: [12, 10, 10, 10, 8]
0 [12, 10, 10, 10, 8]
58: Sent to 2: [12, 10, 10, 10, 8]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [13, 10, 10, 10, 8]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [13, 10, 10, 10, 8]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [13, 10, 10, 10, 8]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [13, 10, 10, 10, 8]
59: Sent to myself. [13, 10, 10, 10, 8]
Updated timestamp: [13, 10, 10, 10, 9]
Updated timestamp: [13, 11, 10, 10, 9]
Updated timestamp: [13, 11, 11, 11, 9]
Updated timestamp: [13, 11, 11, 11, 9]
0 [13, 11, 11, 11, 9]
60: Sent to 3: [13, 11, 11, 11, 9]
0 [13, 11, 11, 11, 9]
61: Sent to 0: [13, 11, 11, 11, 9]
0 [13, 11, 11, 11, 9]
62: Sent to 2: [13, 11, 11, 11, 9]
0 [13, 11, 11, 11, 9]
63: Sent to 0: [13, 11, 11, 11, 9]
0 [13, 11, 11, 11, 9]
64: Sent to 2: [13, 11, 11, 11, 9]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [13, 11, 11, 11, 9]
Updated timestamp: [13, 11, 11, 12, 9]
0 [13, 11, 11, 12, 9]
65: Sent to 2: [13, 11, 11, 12, 9]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [13, 11, 11, 12, 9]
Updated timestamp: [13, 11, 11, 12, 10]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [13, 11, 11, 12, 10]
Updated timestamp: [13, 12, 11, 12, 10]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [13, 12, 11, 12, 10]
Updated timestamp: [13, 12, 12, 12, 10]
0 [13, 12, 12, 12, 10]
66: Sent to 2: [13, 12, 12, 12, 10]
0 [13, 12, 12, 12, 10]
67: Sent to 1: [13, 12, 12, 12, 10]
0 [13, 12, 12, 12, 10]
68: Sent to 2: [13, 12, 12, 12, 10]
69: Sent to myself. [14, 12, 12, 12, 10]
0 [14, 12, 12, 12, 10]
70: Sent to 1: [14, 12, 12, 12, 10]
0 [14, 12, 12, 12, 10]
71: Sent to 3: [14, 12, 12, 12, 10]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [14, 12, 12, 12, 10]
Updated timestamp: [14, 12, 12, 13, 10]
0 [14, 12, 12, 13, 10]
72: Sent to 2: [14, 12, 12, 13, 10]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [14, 12, 12, 13, 10]
Updated timestamp: [14, 12, 12, 13, 11]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [14, 12, 12, 13, 11]
Updated timestamp: [14, 12, 13, 13, 11]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [14, 12, 13, 13, 11]
Updated timestamp: [14, 13, 13, 13, 11]
0 [14, 13, 13, 13, 11]
73: Sent to 2: [14, 13, 13, 13, 11]
0 [14, 13, 13, 13, 11]
74: Sent to 2: [14, 13, 13, 13, 11]
0 [14, 13, 13, 13, 11]
75: Sent to 1: [14, 13, 13, 13, 11]
76: Sent to myself. [15, 13, 13, 13, 11]
77: Sent to myself. [16, 13, 13, 13, 11]
0 [16, 13, 13, 13, 11]
78: Sent to 0: [16, 13, 13, 13, 11]
0 [16, 13, 13, 13, 11]
79: Sent to 2: [16, 13, 13, 13, 11]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [16, 13, 13, 13, 11]
Updated timestamp: [16, 13, 13, 14, 11]
0 [16, 13, 13, 14, 11]
80: Sent to 0: [16, 13, 13, 14, 11]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [16, 13, 13, 14, 11]
Updated timestamp: [16, 13, 13, 14, 12]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [16, 13, 13, 14, 12]
Updated timestamp: [16, 13, 14, 14, 12]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [16, 13, 14, 14, 12]
Updated timestamp: [16, 14, 14, 14, 12]
0 [16, 14, 14, 14, 12]
81: Sent to 1: [16, 14, 14, 14, 12]
0 [16, 14, 14, 14, 12]
82: Sent to 2: [16, 14, 14, 14, 12]
0 [16, 14, 14, 14, 12]
83: Sent to 3: [16, 14, 14, 14, 12]
84: Sent to myself. [17, 14, 14, 14, 12]
85: Sent to myself. [18, 14, 14, 14, 12]
0 [18, 14, 14, 14, 12]
86: Sent to 2: [18, 14, 14, 14, 12]
0 [18, 14, 14, 14, 12]
87: Sent to 1: [18, 14, 14, 14, 12]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [18, 14, 14, 14, 12]
Updated timestamp: [18, 14, 14, 15, 12]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [18, 14, 14, 15, 12]
Updated timestamp: [18, 14, 14, 15, 13]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [18, 14, 14, 15, 13]
Updated timestamp: [18, 14, 15, 15, 13]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [18, 14, 15, 15, 13]
Updated timestamp: [18, 15, 15, 15, 13]
0 [18, 15, 15, 15, 13]
88: Sent to 1: [18, 15, 15, 15, 13]
0 [18, 15, 15, 15, 13]
89: Sent to 1: [18, 15, 15, 15, 13]
0 [18, 15, 15, 15, 13]
90: Sent to 0: [18, 15, 15, 15, 13]
0 [18, 15, 15, 15, 13]
91: Sent to 1: [18, 15, 15, 15, 13]
0 [18, 15, 15, 15, 13]
92: Sent to 1: [18, 15, 15, 15, 13]
0 [18, 15, 15, 15, 13]
93: Sent to 3: [18, 15, 15, 15, 13]
0 [18, 15, 15, 15, 13]
94: Sent to 1: [18, 15, 15, 15, 13]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [18, 15, 15, 15, 13]
Updated timestamp: [18, 15, 15, 16, 13]
0 [18, 15, 15, 16, 13]
95: Sent to 0: [18, 15, 15, 16, 13]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [18, 15, 15, 16, 13]
Updated timestamp: [18, 15, 15, 16, 14]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [18, 15, 15, 16, 14]
Updated timestamp: [18, 15, 16, 16, 14]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [18, 15, 16, 16, 14]
Updated timestamp: [18, 16, 16, 16, 14]
96: Sent to myself. [19, 16, 16, 16, 14]
0 [19, 16, 16, 16, 14]
97: Sent to 2: [19, 16, 16, 16, 14]
0 [19, 16, 16, 16, 14]
98: Sent to 1: [19, 16, 16, 16, 14]
0 [19, 16, 16, 16, 14]
99: Sent to 2: [19, 16, 16, 16, 14]
Finished generating events
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [19, 16, 16, 16, 14]
Updated timestamp: [19, 16, 16, 17, 14]
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [19, 16, 16, 17, 14]
Updated timestamp: [19, 16, 16, 17, 15]
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [19, 16, 16, 17, 15]
Updated timestamp: [19, 16, 17, 17, 15]
Reading from 1: [0, 0, 1, 0, 0]
Old timestamp: [19, 16, 17, 17, 15]
Updated timestamp: [19, 17, 17, 17, 15]
Notifying controller
Reading from 2: [3, 4, 3, 5, 2]
Old timestamp: [19, 17, 17, 17, 15]
Updated timestamp: [19, 17, 18, 17, 15]
Reading from 3: [1, 1, 0, 2, 0]
Old timestamp: [19, 17, 18, 17, 15]
Updated timestamp: [19, 17, 18, 18, 15]
Continuing reading...
Reading from 4: [0, 0, 0, 0, 0]
Old timestamp: [19, 17, 18, 18, 15]
Updated timestamp: [19, 17, 18, 18, 16]
Computer is tearing down.
只需找到所有以“ Reading from”开头的语句，您就会看到该模式。
我认为这与将对象写入套接字并从套接字读取错误的数据有关。老实说，我不知道，这让我感到非常沮丧。
如果您有任何疑问，我一定会回答！
答案 0 :(得分：0)
找到了解决我问题的方法。在将我的对象写入输出流之前，必须添加objectoutputstream重置方法，以便它重置流并且不会从先前的对象回溯。
您可以在此处了解更多信息：Java socket/serialization, object won't update
研究解决方案的力量！