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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.buf; import java.io.Serializable; // XXX Shouldn't be here - has nothing to do with buffers. /** * Main tool for object expiry. * Marks creation and access time of an "expirable" object, * and extra properties like "id", "valid", etc. * * Used for objects that expire - originally Sessions, but * also Contexts, Servlets, cache - or any other object that * expires. * * @author Costin Manolache */ public final class TimeStamp implements Serializable { private long creationTime = 0L; private long lastAccessedTime = creationTime; private long thisAccessedTime = creationTime; private boolean isNew = true; private long maxInactiveInterval = -1; private boolean isValid = false; MessageBytes name; int id=-1; Object parent; public TimeStamp() { } // -------------------- Active methods -------------------- /** * Access notification. This method takes a time parameter in order * to allow callers to efficiently manage expensive calls to * System.currentTimeMillis() */ public void touch(long time) { this.lastAccessedTime = this.thisAccessedTime; this.thisAccessedTime = time; this.isNew=false; } // -------------------- Property access -------------------- /** Return the "name" of the timestamp. This can be used * to associate unique identifier with each timestamped object. * The name is a MessageBytes - i.e. a modifiable byte[] or char[]. */ public MessageBytes getName() { if( name==null ) name=MessageBytes.newInstance();//lazy return name; } /** Each object can have an unique id, similar with name but * providing faster access ( array vs. hashtable lookup ) */ public int getId() { return id; } public void setId( int id ) { this.id=id; } /** Returns the owner of this stamp ( the object that is * time-stamped ). * For a */ public void setParent( Object o ) { parent=o; } public Object getParent() { return parent; } public void setCreationTime(long time) { this.creationTime = time; this.lastAccessedTime = time; this.thisAccessedTime = time; } public long getLastAccessedTime() { return lastAccessedTime; } public long getThisAccessedTime() { return thisAccessedTime; } /** Inactive interval in millis - the time is computed * in millis, convert to secs in the upper layer */ public long getMaxInactiveInterval() { return maxInactiveInterval; } public void setMaxInactiveInterval(long interval) { maxInactiveInterval = interval; } public boolean isValid() { return isValid; } public void setValid(boolean isValid) { this.isValid = isValid; } public boolean isNew() { return isNew; } public void setNew(boolean isNew) { this.isNew = isNew; } public long getCreationTime() { return creationTime; } // -------------------- Maintainance -------------------- public void recycle() { creationTime = 0L; lastAccessedTime = 0L; maxInactiveInterval = -1; isNew = true; isValid = false; id=-1; if( name!=null) name.recycle(); } } |
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