Fonction writer de OutputStream

Bonjour,

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

Code:

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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."); }

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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:

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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

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Savez-vous pourquoi ?

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.