Discussion :

[anthony22360]

Bonjour,

Je fais un envoi de fichier sur un serveur FTP comme ceci :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
ftp.enterLocalPassiveMode();
			 	InputStream inputStream   = new FileInputStream(rep);
			 	OutputStream outputStream = ftp.storeFileStream(rep.getName());
	            byte[] bytesIn = new byte[1024];
	            int read = 0;
 
	            while ((read = inputStream.read(bytesIn)) != -1) {
	            	long d = System.currentTimeMillis();
	                outputStream.write(bytesIn, 0, read);
	                long f = System.currentTimeMillis();
	                System.out.println("Time : " + f + " - " + d + " = " + (f - d));
	            }
 
	            outputStream.flush();
	            inputStream.close();
	            outputStream.close();
 
	            boolean completed = ftp.completePendingCommand();
	            if (completed) 
	            {
	                System.out.println("The file is uploaded successfully.");
	            }

Mon "Benchmark" me sort des choses étonnantes ; J'ai une série d'envois qui se font en moins d'une milliseconde et d'un coup (et ceci à intervalle pseudo-régulier) j'ai un temps d'envoi plus long (> 100 ms).

La preuve ici :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
Time : 1373011640749 - 1373011639531 = 1218
Time : 1373011640749 - 1373011640749 = 0
Time : 1373011640749 - 1373011640749 = 0
Time : 1373011640749 - 1373011640749 = 0
Time : 1373011640749 - 1373011640749 = 0
Time : 1373011640749 - 1373011640749 = 0
Time : 1373011640750 - 1373011640749 = 1
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011640750 - 1373011640750 = 0
Time : 1373011642463 - 1373011640750 = 1713
Time : 1373011642463 - 1373011642463 = 0
Time : 1373011642463 - 1373011642463 = 0
Time : 1373011642463 - 1373011642463 = 0
Time : 1373011642463 - 1373011642463 = 0
Time : 1373011642463 - 1373011642463 = 0
Time : 1373011642463 - 1373011642463 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011642464 - 1373011642464 = 0
Time : 1373011644904 - 1373011642464 = 2440
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644904 - 1373011644904 = 0
Time : 1373011644905 - 1373011644905 = 0
Time : 1373011651674 - 1373011644905 = 6769
Time : 1373011651674 - 1373011651674 = 0
Time : 1373011651674 - 1373011651674 = 0
Time : 1373011651674 - 1373011651674 = 0
Time : 1373011651674 - 1373011651674 = 0
Time : 1373011651674 - 1373011651674 = 0
Time : 1373011651674 - 1373011651674 = 0
Time : 1373011651674 - 1373011651674 = 0
Time : 1373011651674 - 1373011651674 = 0
Time : 1373011651674 - 1373011651674 = 0
Time : 1373011651675 - 1373011651674 = 1
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011651675 - 1373011651675 = 0
Time : 1373011655015 - 1373011651675 = 3340
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655015 - 1373011655015 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011655016 - 1373011655016 = 0
Time : 1373011659294 - 1373011655016 = 4278
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011659294 - 1373011659294 = 0
Time : 1373011660510 - 1373011659294 = 1216

Savez-vous pourquoi ?

[tchize_]

ton client FTP a un buffer interne. Tu ne mesure finalement que le temps d'écriture dans le buffer. Quand le buffer est plein, faut attendre que l'envoi se fasse réellement pour avoir de la place. du coup, là, outputStream.write deviens bloquant.

Tu ne peux avoir la garantie que l'envoi a réellement eu lieu qu'à partir du moment où ftp.completePendingCommand() t'as renvoyé true.