Mercurial > hg > blitz_condensed
diff src/com/go/trove/log/LogEventParsingOutputStream.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/com/go/trove/log/LogEventParsingOutputStream.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,236 @@ +/* ==================================================================== + * 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.io.*; +import java.util.*; + +/****************************************************************************** + * LogEventParsingOutputStream parses the data written to it and converts it + * to LogEvent objects. Add a LogListener to intercept LogEvents. Events are + * parsed based on newline characters (LF, CRLF or CR) or a switch to a + * different thread. + * + * @author Brian S O'Neill + * @version + * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $--> + */ +public class LogEventParsingOutputStream extends OutputStream { + private Vector mListeners; + private Log mSource; + private int mType; + + private byte[] mOneByte = new byte[1]; + + private ByteArrayOutputStream mMessageBuffer; + private String mEncoding; + private Thread mMessageThread; + + private Date mTimestamp; + + // Set to true upon reading a CR so that if the next character is a LF, + // it is consumed. This is how CRLF patterns are discovered. + private boolean mTrackLF; + + /** + * @param source Source object to create events with. + * @param type Type of events to create. + */ + public LogEventParsingOutputStream(Log source, int type) { + mListeners = new Vector(2); + mSource = source; + mType = type; + + mMessageBuffer = new ByteArrayOutputStream(); + } + + /** + * @param source Source object to create events with. + * @param type Type of events to create. + * @param encoding Character encoding of bytes. + */ + public LogEventParsingOutputStream(Log source, int type, + String encoding) { + mListeners = new Vector(2); + mSource = source; + mType = type; + + mMessageBuffer = new ByteArrayOutputStream(); + mEncoding = encoding; + } + + public void addLogListener(LogListener listener) { + mListeners.addElement(listener); + } + + public void removeLogListener(LogListener listener) { + mListeners.removeElement(listener); + } + + private synchronized void flushLogEvent() + throws UnsupportedEncodingException { + + if (mMessageThread == null) { + return; + } + + String message; + if (mEncoding == null) { + message = mMessageBuffer.toString(); + } + else { + message = mMessageBuffer.toString(mEncoding); + } + + if (mMessageBuffer.size() > 10000) { + mMessageBuffer = new ByteArrayOutputStream(); + } + else { + mMessageBuffer.reset(); + } + + LogEvent e; + + if (mTimestamp == null) { + e = new LogEvent(mSource, mType, message, mMessageThread); + } + else { + e = new LogEvent(mSource, mType, message, mMessageThread, + mTimestamp); + mTimestamp = null; + } + + synchronized (mListeners) { + Enumeration group = mListeners.elements(); + while (group.hasMoreElements()) { + ((LogListener)group.nextElement()).logMessage(e); + } + } + } + + public synchronized void write(int b) throws IOException { + mOneByte[0] = (byte)b; + write(mOneByte, 0, 1); + } + + public synchronized void write(byte[] array, int off, int len) + throws IOException { + + if (!isEnabled()) { + if (mMessageBuffer.size() > 0) { + flushLogEvent(); + } + return; + } + + Thread current = Thread.currentThread(); + if (current != mMessageThread) { + if (mMessageBuffer.size() > 0) { + flushLogEvent(); + } + mMessageThread = current; + } + + int writtenLength = 0; + + int i = 0; + for (i=0; i<len; i++) { + byte b = array[i + off]; + if (b == (byte)'\r') { + mTrackLF = true; + writeToBuffer(array, writtenLength + off, i - writtenLength); + // Add one more than i to skip the CR. + writtenLength = i + 1; + flushLogEvent(); + } + else if (b == (byte)'\n') { + if (mTrackLF) { + // Consume the LF of CRLF. + mTrackLF = false; + writtenLength++; + } + else { + writeToBuffer(array, writtenLength + off, + i - writtenLength); + // Add one more than i to skip the LF. + writtenLength = i + 1; + flushLogEvent(); + } + } + else { + mTrackLF = false; + } + } + + writeToBuffer(array, writtenLength + off, i - writtenLength); + } + + public synchronized void close() throws IOException { + mMessageBuffer.close(); + } + + /** + * Returning false discards written data, and events are not generated. + * Default implementation always returns true. + */ + public boolean isEnabled() { + return true; + } + + private void writeToBuffer(byte[] array, int off, int len) { + if (mMessageBuffer.size() == 0) { + mTimestamp = new Date(); + } + mMessageBuffer.write(array, off, len); + } +}