001: /* ====================================================================
002: * The Apache Software License, Version 1.1
003: *
004: * Copyright (c) 1997-2003 The Apache Software Foundation. All rights
005: * reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * 1. Redistributions of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The end-user documentation included with the redistribution,
020: * if any, must include the following acknowledgment:
021: * "This product includes software developed by the
022: * Apache Software Foundation (http://www.apache.org/)."
023: * Alternately, this acknowledgment may appear in the software
024: * itself, if and wherever such third-party acknowledgments
025: * normally appear.
026: *
027: * 4. The names "Jakarta", "Avalon", and "Apache Software Foundation"
028: * must not be used to endorse or promote products derived from this
029: * software without prior written permission. For written
030: * permission, please contact apache@apache.org.
031: *
032: * 5. Products derived from this software may not be called "Apache",
033: * nor may "Apache" appear in their name, without prior written
034: * permission of the Apache Software Foundation.
035: *
036: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
040: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047: * SUCH DAMAGE.
048: * ====================================================================
049: *
050: * This software consists of voluntary contributions made by many
051: * individuals on behalf of the Apache Software Foundation. For more
052: * information on the Apache Software Foundation, please see
053: * <http://www.apache.org/>.
054: */
055: package org.apache.log.output.io;
056:
057: import java.io.File;
058: import java.io.FileOutputStream;
059: import java.io.IOException;
060: import org.apache.log.LogEvent;
061: import org.apache.log.format.Formatter;
062:
063: /**
064: * A target that will open and close a file for each logevent.
065: * This is slow but a more reliable form of logging on some
066: * filesystems/OSes. It should only be used when there is a
067: * small number of log events.
068: *
069: * @author <a href="mailto:peter@apache.org">Peter Donald</a>
070: */
071: public class SafeFileTarget extends FileTarget {
072: /**
073: * Construct file target to write to a file with a formatter.
074: *
075: * @param file the file to write to
076: * @param append true if file is to be appended to, false otherwise
077: * @param formatter the Formatter
078: * @exception IOException if an error occurs
079: */
080: public SafeFileTarget(final File file, final boolean append,
081: final Formatter formatter) throws IOException {
082: super (file, append, formatter);
083: shutdownStream();
084: }
085:
086: /**
087: * Process a log event, via formatting and outputting it.
088: *
089: * @param event the log event
090: */
091: public synchronized void processEvent(final LogEvent event) {
092: if (!isOpen()) {
093: getErrorHandler().error("Writing event to closed stream.",
094: null, event);
095: return;
096: }
097:
098: try {
099: final FileOutputStream outputStream = new FileOutputStream(
100: getFile().getPath(), true);
101: setOutputStream(outputStream);
102: } catch (final Throwable throwable) {
103: getErrorHandler().error(
104: "Unable to open file to write log event.",
105: throwable, event);
106: return;
107: }
108:
109: //write out event
110: super.processEvent(event);
111:
112: shutdownStream();
113: }
114: }
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