78 lines
2.7 KiB
Java
78 lines
2.7 KiB
Java
/*
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* Copyright (c) 2016, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javacserver.util;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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public class LazyInitFileLog extends Log {
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String baseFilename;
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Path destination = null;
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public LazyInitFileLog(String baseFilename) {
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super(null, null);
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this.baseFilename = baseFilename;
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}
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protected void printLogMsg(Level msgLevel, String msg) {
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try {
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// Lazily initialize out/err
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if (out == null && isLevelLogged(msgLevel)) {
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destination = getAvailableDestination();
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out = err = new PrintWriter(new FileWriter(destination.toFile()), true);
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}
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// Proceed to log the message
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super.printLogMsg(msgLevel, msg);
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} catch (IOException e) {
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// This could be bad. We might have run into an error and we can't
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// log it. Resort to printing on stdout.
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System.out.println("IO error occurred: " + e.getMessage());
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System.out.println("Original message: [" + msgLevel + "] " + msg);
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}
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}
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/**
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* @return The first available path of baseFilename, baseFilename.1,
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* basefilename.2, ...
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*/
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private Path getAvailableDestination() {
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Path p = Paths.get(baseFilename);
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int i = 1;
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while (Files.exists(p)) {
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p = Paths.get(baseFilename + "." + i++);
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}
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return p;
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}
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public Path getLogDestination() {
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return destination;
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}
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}
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