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Tomcat example source code file (StaticMembershipInterceptor.java)

This example Tomcat source code file (StaticMembershipInterceptor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

arraylist, arraylist, channelexception, channelinterceptorbase, member, member, staticmembershipinterceptor, staticmembershipinterceptor, thread, thread, util

The Tomcat StaticMembershipInterceptor.java source code

/*
 * 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 ASF 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.catalina.tribes.group.interceptors;

import org.apache.catalina.tribes.group.ChannelInterceptorBase;
import org.apache.catalina.tribes.Member;
import java.util.ArrayList;
import org.apache.catalina.tribes.group.AbsoluteOrder;
import org.apache.catalina.tribes.ChannelException;
import org.apache.catalina.tribes.Channel;

public class StaticMembershipInterceptor
    extends ChannelInterceptorBase {
    protected ArrayList members = new ArrayList();
    protected Member localMember = null;

    public StaticMembershipInterceptor() {
        super();
    }

    public void addStaticMember(Member member) {
        synchronized (members) {
            if (!members.contains(member)) members.add(member);
        }
    }

    public void removeStaticMember(Member member) {
        synchronized (members) {
            if (members.contains(member)) members.remove(member);
        }
    }

    public void setLocalMember(Member member) {
        this.localMember = member;
    }

    /**
     * has members
     */
    public boolean hasMembers() {
        return super.hasMembers() || (members.size()>0);
    }

    /**
     * Get all current cluster members
     * @return all members or empty array
     */
    public Member[] getMembers() {
        if ( members.size() == 0 ) return super.getMembers();
        else {
            synchronized (members) {
                Member[] others = super.getMembers();
                Member[] result = new Member[members.size() + others.length];
                for (int i = 0; i < others.length; i++) result[i] = others[i];
                for (int i = 0; i < members.size(); i++) result[i + others.length] = (Member) members.get(i);
                AbsoluteOrder.absoluteOrder(result);
                return result;
            }//sync
        }//end if
    }

    /**
     *
     * @param mbr Member
     * @return Member
     */
    public Member getMember(Member mbr) {
        if ( members.contains(mbr) ) return (Member)members.get(members.indexOf(mbr));
        else return super.getMember(mbr);
    }

    /**
     * Return the member that represents this node.
     *
     * @return Member
     */
    public Member getLocalMember(boolean incAlive) {
        if (this.localMember != null ) return localMember;
        else return super.getLocalMember(incAlive);
    }
    
    /**
     * Send notifications upwards
     * @param svc int
     * @throws ChannelException
     */
    public void start(int svc) throws ChannelException {
        if ( (Channel.SND_RX_SEQ&svc)==Channel.SND_RX_SEQ ) super.start(Channel.SND_RX_SEQ); 
        if ( (Channel.SND_TX_SEQ&svc)==Channel.SND_TX_SEQ ) super.start(Channel.SND_TX_SEQ); 
        final Member[] mbrs = (Member[])members.toArray(new Member[members.size()]);
        final ChannelInterceptorBase base = this;
        Thread t = new Thread() {
            public void run() {
                for (int i=0; i<mbrs.length; i++ ) {
                    base.memberAdded(mbrs[i]);
                }
            }
        };
        t.start();
        super.start(svc & (~Channel.SND_RX_SEQ) & (~Channel.SND_TX_SEQ));
    }

}

Other Tomcat examples (source code examples)

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