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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.catalina.tribes.group;
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import javax.management.ObjectName;
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import org.apache.catalina.tribes.Channel;
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import org.apache.catalina.tribes.ChannelException;
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import org.apache.catalina.tribes.ChannelInterceptor;
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import org.apache.catalina.tribes.ChannelMessage;
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import org.apache.catalina.tribes.Member;
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import org.apache.catalina.tribes.jmx.JmxRegistry;
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/**
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* Abstract class for the interceptor base class.
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*/
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public abstract class ChannelInterceptorBase implements ChannelInterceptor {
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private ChannelInterceptor next;
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private ChannelInterceptor previous;
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private Channel channel;
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//default value, always process
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protected int optionFlag = 0;
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/**
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* the ObjectName of this ChannelInterceptor.
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*/
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private ObjectName oname = null;
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public ChannelInterceptorBase() {
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}
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public boolean okToProcess(int messageFlags) {
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if (this.optionFlag == 0 ) return true;
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return ((optionFlag&messageFlags) == optionFlag);
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}
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@Override
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public final void setNext(ChannelInterceptor next) {
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this.next = next;
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}
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@Override
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public final ChannelInterceptor getNext() {
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return next;
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}
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@Override
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public final void setPrevious(ChannelInterceptor previous) {
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this.previous = previous;
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}
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@Override
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public void setOptionFlag(int optionFlag) {
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this.optionFlag = optionFlag;
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}
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@Override
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public final ChannelInterceptor getPrevious() {
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return previous;
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}
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@Override
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public int getOptionFlag() {
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return optionFlag;
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}
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@Override
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public void sendMessage(Member[] destination, ChannelMessage msg, InterceptorPayload payload) throws
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ChannelException {
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if (getNext() != null) getNext().sendMessage(destination, msg, payload);
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}
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@Override
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public void messageReceived(ChannelMessage msg) {
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if (getPrevious() != null) getPrevious().messageReceived(msg);
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}
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@Override
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public void memberAdded(Member member) {
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//notify upwards
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if (getPrevious() != null) getPrevious().memberAdded(member);
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}
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@Override
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public void memberDisappeared(Member member) {
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//notify upwards
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if (getPrevious() != null) getPrevious().memberDisappeared(member);
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}
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@Override
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public void heartbeat() {
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if (getNext() != null) getNext().heartbeat();
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}
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/**
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* has members
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*/
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@Override
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public boolean hasMembers() {
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if ( getNext()!=null )return getNext().hasMembers();
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else return false;
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}
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/**
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* Get all current cluster members
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* @return all members or empty array
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*/
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@Override
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public Member[] getMembers() {
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if ( getNext()!=null ) return getNext().getMembers();
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else return null;
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}
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/**
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*
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* @param mbr Member
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* @return Member
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*/
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@Override
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public Member getMember(Member mbr) {
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if ( getNext()!=null) return getNext().getMember(mbr);
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else return null;
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}
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/**
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* Return the member that represents this node.
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*
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* @return Member
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*/
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@Override
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public Member getLocalMember(boolean incAlive) {
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if ( getNext()!=null ) return getNext().getLocalMember(incAlive);
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else return null;
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}
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/**
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* Starts up the channel. This can be called multiple times for individual services to start
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* The svc parameter can be the logical or value of any constants
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* @param svc int value of <BR>
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* DEFAULT - will start all services <BR>
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* MBR_RX_SEQ - starts the membership receiver <BR>
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* MBR_TX_SEQ - starts the membership broadcaster <BR>
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* SND_TX_SEQ - starts the replication transmitter<BR>
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* SND_RX_SEQ - starts the replication receiver<BR>
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* @throws ChannelException if a startup error occurs or the service is already started.
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*/
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@Override
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public void start(int svc) throws ChannelException {
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if ( getNext()!=null ) getNext().start(svc);
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// register jmx
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JmxRegistry jmxRegistry = JmxRegistry.getRegistry(channel);
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if (jmxRegistry != null) this.oname = jmxRegistry.registerJmx(
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",component=Interceptor,interceptorName=" + getClass().getSimpleName(), this);
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}
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/**
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* Shuts down the channel. This can be called multiple times for individual services to shutdown
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* The svc parameter can be the logical or value of any constants
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* @param svc int value of <BR>
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* DEFAULT - will shutdown all services <BR>
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* MBR_RX_SEQ - stops the membership receiver <BR>
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* MBR_TX_SEQ - stops the membership broadcaster <BR>
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* SND_TX_SEQ - stops the replication transmitter<BR>
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* SND_RX_SEQ - stops the replication receiver<BR>
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* @throws ChannelException if a startup error occurs or the service is already started.
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*/
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@Override
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public void stop(int svc) throws ChannelException {
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if (getNext() != null) getNext().stop(svc);
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if (oname != null) {
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JmxRegistry.getRegistry(channel).unregisterJmx(oname);
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oname = null;
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}
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channel = null;
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}
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@Override
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public void fireInterceptorEvent(InterceptorEvent event) {
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//empty operation
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}
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/**
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* Return the channel that is related to this interceptor
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* @return Channel
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*/
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@Override
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public Channel getChannel() {
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return channel;
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}
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/**
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* Set the channel that is related to this interceptor
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* @param channel The channel
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*/
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@Override
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public void setChannel(Channel channel) {
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this.channel = channel;
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}
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}
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