| /* |
| * Copyright (C) 2009-2010, Google Inc. and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.util.io; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InterruptedIOException; |
| import java.io.OutputStream; |
| |
| /** |
| * Thread to copy from an input stream to an output stream. |
| */ |
| public class StreamCopyThread extends Thread { |
| private static final int BUFFER_SIZE = 1024; |
| |
| private final InputStream src; |
| |
| private final OutputStream dst; |
| |
| private volatile boolean done; |
| |
| /** Lock held by flush to avoid interrupting a write. */ |
| private final Object writeLock; |
| |
| /** |
| * Create a thread to copy data from an input stream to an output stream. |
| * |
| * @param i |
| * stream to copy from. The thread terminates when this stream |
| * reaches EOF. The thread closes this stream before it exits. |
| * @param o |
| * stream to copy into. The destination stream is automatically |
| * closed when the thread terminates. |
| */ |
| public StreamCopyThread(InputStream i, OutputStream o) { |
| setName(Thread.currentThread().getName() + "-StreamCopy"); //$NON-NLS-1$ |
| src = i; |
| dst = o; |
| writeLock = new Object(); |
| } |
| |
| /** |
| * Request that the thread terminate, and wait for it. |
| * <p> |
| * This method signals to the copy thread that it should stop as soon as |
| * there is no more IO occurring. |
| * |
| * @throws java.lang.InterruptedException |
| * the calling thread was interrupted. |
| */ |
| public void halt() throws InterruptedException { |
| for (;;) { |
| join(250 /* milliseconds */); |
| if (isAlive()) { |
| done = true; |
| interrupt(); |
| } else |
| break; |
| } |
| } |
| |
| @Override |
| public void run() { |
| try { |
| final byte[] buf = new byte[BUFFER_SIZE]; |
| boolean readInterrupted = false; |
| for (;;) { |
| try { |
| if (readInterrupted) { |
| synchronized (writeLock) { |
| boolean interruptedAgain = Thread.interrupted(); |
| dst.flush(); |
| if (interruptedAgain) { |
| interrupt(); |
| } |
| } |
| readInterrupted = false; |
| } |
| |
| if (done) |
| break; |
| |
| final int n; |
| try { |
| n = src.read(buf); |
| } catch (InterruptedIOException wakey) { |
| readInterrupted = true; |
| continue; |
| } |
| if (n < 0) |
| break; |
| |
| synchronized (writeLock) { |
| boolean writeInterrupted = Thread.interrupted(); |
| dst.write(buf, 0, n); |
| if (writeInterrupted) { |
| interrupt(); |
| } |
| } |
| } catch (IOException e) { |
| break; |
| } |
| } |
| } finally { |
| try { |
| src.close(); |
| } catch (IOException e) { |
| // Ignore IO errors on close |
| } |
| try { |
| dst.close(); |
| } catch (IOException e) { |
| // Ignore IO errors on close |
| } |
| } |
| } |
| } |