我有一个程序,它探索文件系统,从一个给定的root.the程序递归地探索从根点的所有目录,并在tiff文件上执行一个过程。确实它合并了每个两个tiff文件。我使用ExecutorService和ThreadPoolExecutor来处理合并函数。java:线程完全不能完成run()方法吗?
ExecutorService exec = Executors.newFixedThreadPool(threadsNumber);
inputDirectoryProcess(inputDir);
exec.shutdown();
try {
exec.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
} catch (InterruptedException e) {
e.printStackTrace();
}
成为每一个合并功能我用以下:
exec.submit(new MultipageTask(a, Integer.toString(intDetector(directoryFiles.get(i + 1).getName())/2), out));
以下是MultipageTask类:
public void run() {
Thread thread = Thread.currentThread();
System.out.println("start by " + thread.getName() + " (" + thread.getId() + ")");
Integer[] resoulutions = null;
try {
BufferedImage image[] = new BufferedImage[tifImages.length];
for (int i = 0; i < tifImages.length; i++) {
resoulutions = getsize(tifImages[i].getPath());
SeekableStream ss = null;
ss = new FileSeekableStream(tifImages[i]);
ImageDecoder decoder = ImageCodec.createImageDecoder("tiff", ss, null);
PlanarImage op = null;
op = new NullOpImage(decoder.decodeAsRenderedImage(0),
null, OpImage.OP_IO_BOUND, null);
image[i] = op.getAsBufferedImage();
}
TIFFField[] fields = new TIFFField[3];
// ResolutionUnit
TIFFField fieldResUnit = new TIFFField(296, TIFFField.TIFF_SHORT, 1,
(Object) new char[] { 2 });
fields[0] = fieldResUnit;
// XResolution
TIFFField fieldXRes = new TIFFField(282, TIFFField.TIFF_RATIONAL, 1,
(Object) new long[][] { { resoulutions[0], 1 } });
fields[1] = fieldXRes;
// YResolution
TIFFField fieldYRes = new TIFFField(283, TIFFField.TIFF_RATIONAL, 1,
(Object) new long[][] { { resoulutions[1], 1 } });
fields[2] = fieldYRes;
TIFFEncodeParam params = new TIFFEncodeParam();
params.setCompression(TIFFEncodeParam.COMPRESSION_GROUP4);
params.setExtraFields(fields);
OutputStream out = new FileOutputStream(outDir + "\\" + image_name + ".tif");
ImageEncoder encoder = ImageCodec.createImageEncoder("tiff", out, params);
Vector vector = new Vector();
for (int i = 1; i < tifImages.length; i++) {
vector.add(image[i]);
}
params.setExtraImages(vector.iterator());
encoder.encode(image[0]);
out.close();
System.out.println("end by " + thread.getName() + " (" + thread.getId() + ")");
} catch (IOException e) {
e.printStackTrace();
}
increasetCount();
}
}
public synchronized void increasetCount() {
convertCount = convertCount + 2;
updateBar(convertCount);
}
节目结束后,我注意到,一些文件没有处理。所以我登录进入和退出线程如上所示。在控制台中,我看到以下几行:
start by pool-2-thread-4 (30)
end by pool-2-thread-2 (28)
start by pool-2-thread-2 (28)
start by pool-2-thread-4 (30)
start by pool-2-thread-2 (28)
start by pool-2-thread-1 (27)
start by pool-2-thread-1 (27)
start by pool-2-thread-4 (30)
end by pool-2-thread-1 (27)
end by pool-2-thread-2 (28)
start by pool-2-thread-1 (27)
start by pool-2-thread-2 (28)
正如你看到一些像28启动的线程,但没有完成。这导致失去了一些合并过程和程序无法处理所有的tiff文件。
注:我应该提到,当我增加threadsNumber时,缺少的增加!
我该如何解决?我想确保每个线程完成运行过程。
感谢和抱歉,因为糟糕的英语。
你使用类似sempahores,锁或条件的try/catch包围你的代码?如果是的话,它会死锁。 – 2014-09-29 11:37:24
你是不是使用守护进程线程(通常情况并非如此)?您可以通过调用'shutdown'来确保'ExecutorService'中的所有任务都已完成。 – 2014-09-29 11:41:31
我敢打赌你的处理代码是罪魁祸首。你能告诉我们关于它的一些事吗? – watery 2014-09-29 11:56:21