| /** |
| * Copyright (c) 2004-2011 QOS.ch |
| * All rights reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sublicense, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| */ |
| package org.slf4j.agent; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.lang.instrument.Instrumentation; |
| import java.util.Date; |
| import java.util.Properties; |
| |
| import org.slf4j.instrumentation.LogTransformer; |
| |
| /** |
| * Entry point for slf4j-ext when used as a Java agent. |
| * |
| */ |
| public class AgentPremain { |
| |
| /** |
| * JavaAgent premain entry point as specified in the MANIFEST.MF file. See |
| * <a href="http://java.sun.com/javase/6/docs/api/java/lang/instrument/package-summary.html">http://java.sun.com/javase/6/docs/api/java/lang/instrument/package-summary.html</a> for details. |
| * |
| * @param agentArgument |
| * string provided after "=" up to first space |
| * @param instrumentation |
| * instrumentation environment provided by the JVM |
| */ |
| public static void premain(String agentArgument, Instrumentation instrumentation) { |
| |
| // We cannot do sanity checks for slf4j here as the jars loaded |
| // by the application are not visible here. |
| |
| LogTransformer.Builder builder = new LogTransformer.Builder(); |
| builder = builder.addEntryExit(true); |
| |
| if (agentArgument != null) { |
| Properties args = parseArguments(agentArgument, ","); |
| |
| if (args.containsKey(AgentOptions.VERBOSE)) { |
| builder = builder.verbose(true); |
| } |
| |
| if (args.containsKey(AgentOptions.TIME)) { |
| printStartStopTimes(); |
| } |
| |
| if (args.containsKey(AgentOptions.IGNORE)) { |
| String ignore = args.getProperty(AgentOptions.IGNORE); |
| builder = builder.ignore(ignore.split(":")); |
| } |
| |
| if (args.containsKey(AgentOptions.LEVEL)) { |
| builder = builder.level(args.getProperty(AgentOptions.LEVEL)); |
| } |
| } |
| |
| instrumentation.addTransformer(builder.build()); |
| } |
| |
| /** |
| * Consider the argument string to be a property file (by converting the |
| * splitter character to line feeds), and then reading it like any other |
| * property file. |
| * |
| * |
| * @param agentArgument |
| * string given by instrumentation framework |
| * @param separator |
| * String to convert to line feeds |
| * @return argument converted to properties |
| */ |
| private static Properties parseArguments(String agentArgument, String separator) { |
| Properties p = new Properties(); |
| try { |
| String argumentAsLines = agentArgument.replaceAll(separator, "\n"); |
| p.load(new ByteArrayInputStream(argumentAsLines.getBytes())); |
| } catch (IOException e) { |
| String s = "Could not load arguments as properties"; |
| throw new RuntimeException(s, e); |
| } |
| return p; |
| } |
| |
| /** |
| * Print the start message to System.err with the time NOW, and register a |
| * shutdown hook which will print the stop message to System.err with the |
| * time then and the number of milliseconds passed since. |
| * |
| */ |
| private static void printStartStopTimes() { |
| final long start = System.currentTimeMillis(); |
| |
| System.err.println("Start at " + new Date()); |
| |
| Thread hook = new Thread(() -> { |
| long timePassed = System.currentTimeMillis() - start; |
| System.err.println("Stop at " + new Date() + ", execution time = " + timePassed + " ms"); |
| }); |
| Runtime.getRuntime().addShutdownHook(hook); |
| } |
| } |