| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The SF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations under the License. |
| */ |
| package org.apache.sling.discovery.base.its.setup; |
| |
| import java.io.BufferedWriter; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| import java.io.Writer; |
| import java.net.URL; |
| |
| import org.apache.log4j.Layout; |
| import org.apache.log4j.LogManager; |
| import org.apache.log4j.PatternLayout; |
| import org.apache.log4j.PropertyConfigurator; |
| import org.apache.log4j.WriterAppender; |
| |
| public class WithholdingAppender extends WriterAppender { |
| |
| private final ByteArrayOutputStream baos; |
| private final Writer writer; |
| |
| /** |
| * Install the WithholdingAppender, essentially muting all logging |
| * and withholding it until release() is called |
| * @return the WithholdingAppender that can be used to get the |
| * withheld log output |
| */ |
| public static WithholdingAppender install() { |
| LogManager.getRootLogger().removeAllAppenders(); |
| final WithholdingAppender withholdingAppender = new WithholdingAppender( |
| new PatternLayout("%d{dd.MM.yyyy HH:mm:ss.SSS} *%-5p* [%t] %c{1}: %m\n")); |
| LogManager.getRootLogger().addAppender(withholdingAppender); |
| return withholdingAppender; |
| } |
| |
| /** |
| * Release this WithholdingAppender and optionally dump what was |
| * withheld (eg in case of an exception) |
| * @param dumpToSysout |
| */ |
| public void release(boolean dumpToSysout) { |
| LogManager.resetConfiguration(); |
| URL log4jPropertiesFile = getClass().getResource("/log4j.properties"); |
| PropertyConfigurator.configure(log4jPropertiesFile); |
| if (dumpToSysout) { |
| String withheldLogoutput = getBuffer(); |
| System.out.println(withheldLogoutput); |
| } |
| } |
| |
| public WithholdingAppender(Layout layout) { |
| this.layout = layout; |
| this.baos = new ByteArrayOutputStream(); |
| this.writer = new BufferedWriter(new OutputStreamWriter(baos)); |
| this.setWriter(writer); |
| } |
| |
| public String getBuffer() { |
| try{ |
| writer.flush(); |
| } catch(IOException e) { |
| // ignore |
| } |
| return baos.toString(); |
| } |
| } |