Mercurial > hg > blitz_stable
view src/com/go/trove/log/IntervalLogStream.java @ 32:243c74d599bf
Update ignores
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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/* ==================================================================== * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group * ==================================================================== * The Tea Software License, Version 1.1 * * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, * if any, must include the following acknowledgment: * "This product includes software developed by the * Walt Disney Internet Group (http://opensource.go.com/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must * not be used to endorse or promote products derived from this * software without prior written permission. For written * permission, please contact opensource@dig.com. * * 5. Products derived from this software may not be called "Tea", * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior * written permission of the Walt Disney Internet Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * For more information about Tea, please see http://opensource.go.com/. */ package com.go.trove.log; import java.lang.ref.WeakReference; import java.io.*; import java.util.*; /****************************************************************************** * IntervalLogStream writes to an underlying OutputStream that is opened once * per a specific time interval. This class forms the basis of a dated file * logging mechanism. * * @author Brian S O'Neill * @version * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $--> * @see DailyFileLogStream */ public abstract class IntervalLogStream extends OutputStream { private static int cCounter; private static synchronized String nextName() { return "IntervalLogStream Auto Rollover " + cCounter++; } private Factory mFactory; private OutputStream mOut; private boolean mIsClosed; private Calendar mIntervalStart; private Calendar mNextIntervalStart; private Thread mRolloverThread; public IntervalLogStream(Factory factory) { mFactory = factory; } /** * Starts up a thread that automatically rolls the underlying OutputStream * at the beginning of the interval, even if no output is written. */ public synchronized void startAutoRollover() { // TODO: If java.util.Timer class is available, use it instead of // creating a thread each time. if (mRolloverThread == null) { mRolloverThread = new Thread(new AutoRollover(this), nextName()); mRolloverThread.setDaemon(true); mRolloverThread.start(); } } /** * If the auto-rollover thread was started, calling this method will * stop it. */ public synchronized void stopAutoRollover() { if (mRolloverThread != null) { mRolloverThread.interrupt(); mRolloverThread = null; } } /** * Moves calendar to beginning of log interval. */ protected abstract void moveToIntervalStart(Calendar cal); /** * Moves calendar to beginning of next log interval. */ protected abstract void moveToNextIntervalStart(Calendar cal); public synchronized void write(int b) throws IOException { getOutputStream().write(b); } public synchronized void write(byte[] array) throws IOException { getOutputStream().write(array, 0, array.length); } public synchronized void write(byte[] array, int off, int len) throws IOException { getOutputStream().write(array, off, len); } public synchronized void flush() throws IOException { getOutputStream().flush(); } /** * Closes any underlying OutputStreams and stops the auto-rollover thread * if it is running. */ public synchronized void close() throws IOException { mIsClosed = true; stopAutoRollover(); if (mOut != null) { mOut.close(); } } protected synchronized void finalize() throws IOException { close(); } private synchronized OutputStream getOutputStream() throws IOException { if (mIsClosed) { throw new IOException("LogStream is closed"); } Calendar cal = Calendar.getInstance(); if (mOut == null || cal.before(mIntervalStart) || !cal.before(mNextIntervalStart)) { if (mOut != null) { mOut.close(); } mOut = new BufferedOutputStream (mFactory.openOutputStream(cal.getTime())); setIntervalEndpoints(cal); } return mOut; } private void setIntervalEndpoints(Calendar cal) { mIntervalStart = (Calendar)cal.clone(); moveToIntervalStart(mIntervalStart); mNextIntervalStart = cal; moveToNextIntervalStart(mNextIntervalStart); } public static interface Factory { public OutputStream openOutputStream(Date date) throws IOException; } /** * Thread that just wakes up at the proper time so that log stream * rolls over even when there is no output. */ private static class AutoRollover implements Runnable { // Refer to the log stream via a weak reference so that this thread // doesn't prevent it from being garbage collected. private WeakReference mLogStream; public AutoRollover(IntervalLogStream stream) { mLogStream = new WeakReference(stream); } public void run() { try { while (!Thread.interrupted()) { IntervalLogStream stream = (IntervalLogStream)mLogStream.get(); if (stream == null || stream.mIsClosed) { break; } try { // Just requesting the stream forces a rollover. stream.getOutputStream(); } catch (IOException e) { } Calendar cal = Calendar.getInstance(); stream.moveToNextIntervalStart(cal); // Clear reference to stream so that it isn't strongly // reachable from this thread. stream = null; long calTime = cal.getTime().getTime(); long timeLeft = calTime - System.currentTimeMillis(); while (timeLeft > 0) { // Sleep until next start interval. ZZZ... Thread.sleep(timeLeft); timeLeft = calTime - System.currentTimeMillis(); } } } catch (InterruptedException e) { // Exit thread. } } } }