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Diffstat (limited to 'libjava/java/util/logging/SocketHandler.java')
| -rw-r--r-- | libjava/java/util/logging/SocketHandler.java | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/libjava/java/util/logging/SocketHandler.java b/libjava/java/util/logging/SocketHandler.java new file mode 100644 index 0000000..d9939a0 --- /dev/null +++ b/libjava/java/util/logging/SocketHandler.java @@ -0,0 +1,225 @@ +/* SocketHandler.java + -- a class for publishing log messages to network sockets + +Copyright (C) 2002 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA +02111-1307 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. + +*/ + + +package java.util.logging; + + +/** + * A <code>SocketHandler</code> publishes log records to + * a TCP/IP socket. + * + * <p><strong>Configuration:</strong> Values of the subsequent + * <code>LogManager</code> properties are taken into consideration + * when a <code>SocketHandler</code> is initialized. + * If a property is not defined, or if it has an invalid + * value, a default is taken without an exception being thrown. + * + * <ul> + * + * <li><code>java.util.SocketHandler.level</code> - specifies + * the initial severity level threshold. Default value: + * <code>Level.ALL</code>.</li> + * + * <li><code>java.util.SocketHandler.filter</code> - specifies + * the name of a Filter class. Default value: No Filter.</li> + * + * <li><code>java.util.SocketHandler.formatter</code> - specifies + * the name of a Formatter class. Default value: + * <code>java.util.logging.XMLFormatter</code>.</li> + * + * <li><code>java.util.SocketHandler.encoding</code> - specifies + * the name of the character encoding. Default value: + * the default platform encoding. + * + * <li><code>java.util.SocketHandler.host</code> - specifies + * the name of the host to which records are published. + * There is no default value for this property; if it is + * not set, the SocketHandler constructor will throw + * an exception.</li> + * + * <li><code>java.util.SocketHandler.port</code> - specifies + * the TCP/IP port to which records are published. + * There is no default value for this property; if it is + * not set, the SocketHandler constructor will throw + * an exception.</li> + * + * </ul> + * + * @author Sascha Brawer (brawer@acm.org) + */ +public class SocketHandler + extends StreamHandler +{ + /** + * Constructs a <code>SocketHandler</code> that publishes log + * records to a TCP/IP socket. Tthe initial configuration is + * determined by the <code>LogManager</code> properties described + * above. + * + * @throws java.io.IOException if the connection to the specified + * network host and port cannot be established. + * + * @throws java.lang.IllegalArgumentException if either the + * <code>java.util.logging.SocketHandler.host</code> + * or <code>java.util.logging.SocketHandler.port</code> + * LogManager properties is not defined, or specifies + * an invalid value. + */ + public SocketHandler() + throws java.io.IOException + { + this(LogManager.getLogManager().getProperty("java.util.logging.SocketHandler.host"), + getPortNumber()); + } + + + /** + * Constructs a <code>SocketHandler</code> that publishes log + * records to a TCP/IP socket. With the exception of the internet + * host and port, the initial configuration is determined by the + * <code>LogManager</code> properties described above. + * + * @param host the Internet host to which log records will be + * forwarded. + * + * @param port the port at the host which will accept a request + * for a TCP/IP connection. + * + * @throws java.io.IOException if the connection to the specified + * network host and port cannot be established. + * + * @throws java.lang.IllegalArgumentException if either + * <code>host</code> or <code>port</code> specify + * an invalid value. + */ + public SocketHandler(String host, int port) + throws java.io.IOException + { + super(createSocket(host, port), + "java.util.logging.SocketHandler", + /* default level */ Level.ALL, + /* formatter */ null, + /* default formatter */ XMLFormatter.class); + } + + + /** + * Retrieves the port number from the java.util.logging.SocketHandler.port + * LogManager property. + * + * @throws IllegalArgumentException if the property is not defined or + * does not specify an integer value. + */ + private static int getPortNumber() + { + try { + return Integer.parseInt(LogManager.getLogManager().getProperty("java.util.logging.SocketHandler.port")); + } catch (Exception ex) { + throw new IllegalArgumentException(); + } + } + + + /** + * Creates an OutputStream for publishing log records to an Internet + * host and port. This private method is a helper for use by the + * constructor of SocketHandler. + * + * @param host the Internet host to which log records will be + * forwarded. + * + * @param port the port at the host which will accept a request + * for a TCP/IP connection. + * + * @throws java.io.IOException if the connection to the specified + * network host and port cannot be established. + * + * @throws java.lang.IllegalArgumentException if either + * <code>host</code> or <code>port</code> specify + * an invalid value. + */ + private static java.io.OutputStream createSocket(String host, int port) + throws java.io.IOException, java.lang.IllegalArgumentException + { + java.net.Socket socket; + + if ((host == null) || (port < 1)) + throw new IllegalArgumentException(); + + socket = new java.net.Socket(host, port); + + socket.shutdownInput(); + + /* The architecture of the logging framework provides replaceable + * formatters. Because these formatters perform their task by + * returning one single String for each LogRecord to be formatted, + * there is no need to buffer. + */ + socket.setTcpNoDelay(true); + + return socket.getOutputStream(); + } + + + /** + * Publishes a <code>LogRecord</code> to the network socket, + * provided the record passes all tests for being loggable. + * In addition, all data that may have been buffered will + * be forced to the network stream. + * + * <p>Most applications do not need to call this method directly. + * Instead, they will use a {@link Logger} instance, which will + * create LogRecords and distribute them to registered handlers. + * + * <p>In case of an I/O failure, the <code>ErrorManager</code> + * of this <code>SocketHandler</code> will be informed, but the caller + * of this method will not receive an exception. + * + * @param record the log event to be published. + */ + public void publish(LogRecord record) + { + super.publish(record); + flush(); + } +} + |