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What this is

This file is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

 *  Copyright 1997-2004 The Apache Sofware 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
 *  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.depend;

/** How it works:
    - A DependManager gets loaded with a number of Dependency
    - each Dependency includes a File and a timestamp.
    - If any of the Files is changed after timestamp this DependManager
    will set "expired" to true
    - One check at a time, but without sync
    - if a check was done recently ( delay property ) - assume nothing changed

    It is also possible to do the checks in background, but for big
    servers ( with many contexts) it have scalability problems.
public class DependManager {
    static org.apache.commons.logging.Log logger =

    int delay=4000;
    Dependency deps[];
    int depsCount=0;
    long lastCheck=0;
    boolean checking=false;
    long checkTime=0;
    int checkCount=0;

    private boolean expired=false;

    static final int INITIAL_DEP_SIZE=32;
    public DependManager() {

    public DependManager(int initial_size) {
	deps=new Dependency[initial_size];

    /** Reset the depend manager - all dependencies are reset too.
	This will be called after a reload
    public void reset() {
	for( int i=0; i= deps.length ) {
	    Dependency deps1[]=new Dependency[ deps.length *2 ];
	    System.arraycopy( deps, 0, deps1, 0 , depsCount );
	deps[depsCount++]= dep ;
	if( logger.isDebugEnabled() )
	    logger.debug( "Added " + dep.getOrigin() + " " + dep.getTarget());

    // -------------------- Private 

    private int debug=0;

    public void setDebug( int i ) {

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