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The source code/* * Copyright 1999-2004 The Apache Software Foundation * * Licensed 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.tomcat.util.threads; import java.util.Hashtable; /** Special thread that allows storing of attributes and notes. * A guard is used to prevent untrusted code from accessing the * attributes. * * This avoids hash lookups and provide something very similar * with ThreadLocal ( but compatible with JDK1.1 and faster on * JDK < 1.4 ). * * The main use is to store 'state' for monitoring ( like "processing * request 'GET /' "). */ public class ThreadWithAttributes extends Thread { private Object control; public static int MAX_NOTES=16; private Object notes[]=new Object[MAX_NOTES]; private Hashtable attributes=new Hashtable(); private String currentStage; private Object param; private Object thData[]; public ThreadWithAttributes(Object control, Runnable r) { super(r); this.control=control; } public final Object[] getThreadData(Object control ) { return thData; } public final void setThreadData(Object control, Object thData[] ) { this.thData=thData; } /** Notes - for attributes that need fast access ( array ) * The application is responsible for id management */ public final void setNote( Object control, int id, Object value ) { if( this.control != control ) return; notes[id]=value; } /** Information about the curent performed operation */ public final String getCurrentStage(Object control) { if( this.control != control ) return null; return currentStage; } /** Information about the current request ( or the main object * we are processing ) */ public final Object getParam(Object control) { if( this.control != control ) return null; return param; } public final void setCurrentStage(Object control, String currentStage) { if( this.control != control ) return; this.currentStage = currentStage; } public final void setParam( Object control, Object param ) { if( this.control != control ) return; this.param=param; } public final Object getNote(Object control, int id ) { if( this.control != control ) return null; return notes[id]; } /** Generic attributes. You'll need a hashtable lookup - * you can use notes for array access. */ public final Hashtable getAttributes(Object control) { return attributes; } } |
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