TimeoutOutputStream.java

/*
 * Copyright (C) 2009, 2013 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.InterruptedIOException;
import java.io.OutputStream;
import java.text.MessageFormat;

import org.eclipse.jgit.internal.JGitText;

/**
 * OutputStream with a configurable timeout.
 */
public class TimeoutOutputStream extends OutputStream {
	private final OutputStream dst;

	private final InterruptTimer myTimer;

	private int timeout;

	/**
	 * Wrap an output stream with a timeout on all write operations.
	 *
	 * @param destination
	 *            base input stream (to write to). The stream must be
	 *            interruptible (most socket streams are).
	 * @param timer
	 *            timer to manage the timeouts during writes.
	 */
	public TimeoutOutputStream(final OutputStream destination,
			final InterruptTimer timer) {
		dst = destination;
		myTimer = timer;
	}

	/**
	 * Get number of milliseconds before aborting a write.
	 *
	 * @return number of milliseconds before aborting a write.
	 */
	public int getTimeout() {
		return timeout;
	}

	/**
	 * Set number of milliseconds before aborting a write.
	 *
	 * @param millis
	 *            number of milliseconds before aborting a write. Must be >
	 *            0.
	 */
	public void setTimeout(int millis) {
		if (millis < 0)
			throw new IllegalArgumentException(MessageFormat.format(
					JGitText.get().invalidTimeout, Integer.valueOf(millis)));
		timeout = millis;
	}

	/** {@inheritDoc} */
	@Override
	public void write(int b) throws IOException {
		try {
			beginWrite();
			dst.write(b);
		} catch (InterruptedIOException e) {
			throw writeTimedOut(e);
		} finally {
			endWrite();
		}
	}

	/** {@inheritDoc} */
	@Override
	public void write(byte[] buf) throws IOException {
		write(buf, 0, buf.length);
	}

	/** {@inheritDoc} */
	@Override
	public void write(byte[] buf, int off, int len) throws IOException {
		try {
			beginWrite();
			dst.write(buf, off, len);
		} catch (InterruptedIOException e) {
			throw writeTimedOut(e);
		} finally {
			endWrite();
		}
	}

	/** {@inheritDoc} */
	@Override
	public void flush() throws IOException {
		try {
			beginWrite();
			dst.flush();
		} catch (InterruptedIOException e) {
			throw writeTimedOut(e);
		} finally {
			endWrite();
		}
	}

	/** {@inheritDoc} */
	@Override
	public void close() throws IOException {
		try {
			beginWrite();
			dst.close();
		} catch (InterruptedIOException e) {
			throw writeTimedOut(e);
		} finally {
			endWrite();
		}
	}

	private void beginWrite() {
		myTimer.begin(timeout);
	}

	private void endWrite() {
		myTimer.end();
	}

	private InterruptedIOException writeTimedOut(InterruptedIOException cause) {
		InterruptedIOException e = new InterruptedIOException(
				MessageFormat.format(JGitText.get().writeTimedOut,
						Integer.valueOf(timeout)));
		e.initCause(cause);
		return e;
	}
}