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/*
* 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.mina.filter.util;
import org.apache.mina.core.filterchain.IoFilter;
import org.apache.mina.core.filterchain.IoFilterAdapter;
import org.apache.mina.core.filterchain.IoFilterChain;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.core.write.WriteRequest;
/**
* An {@link IoFilter}s wrapper that keeps track of the number of usages of this filter and will call init/destroy
* when the filter is not in use.
*
* @author Apache MINA Project
* @org.apache.xbean.XBean
*/
public class ReferenceCountingFilter extends IoFilterAdapter {
private final IoFilter filter;
private int count = 0;
/**
* Creates a new ReferenceCountingFilter instance
*
* @param filter the filter we are counting references on
*/
public ReferenceCountingFilter(IoFilter filter) {
this.filter = filter;
}
/**
* {@inheritDoc}
*/
@Override
public synchronized void onPreAdd(IoFilterChain parent, String name, NextFilter nextFilter) throws Exception {
if (0 == count) {
filter.init();
}
++count;
filter.onPreAdd(parent, name, nextFilter);
}
/**
* {@inheritDoc}
*/
@Override
public synchronized void onPostRemove(IoFilterChain parent, String name, NextFilter nextFilter) throws Exception {
filter.onPostRemove(parent, name, nextFilter);
--count;
if (0 == count) {
filter.destroy();
}
}
/**
* {@inheritDoc}
*/
@Override
public void exceptionCaught(NextFilter nextFilter, IoSession session, Throwable cause) throws Exception {
filter.exceptionCaught(nextFilter, session, cause);
}
/**
* {@inheritDoc}
*/
@Override
public void filterClose(NextFilter nextFilter, IoSession session) throws Exception {
filter.filterClose(nextFilter, session);
}
/**
* {@inheritDoc}
*/
@Override
public void filterWrite(NextFilter nextFilter, IoSession session, WriteRequest writeRequest) throws Exception {
filter.filterWrite(nextFilter, session, writeRequest);
}
/**
* {@inheritDoc}
*/
@Override
public void messageReceived(NextFilter nextFilter, IoSession session, Object message) throws Exception {
filter.messageReceived(nextFilter, session, message);
}
/**
* {@inheritDoc}
*/
@Override
public void messageSent(NextFilter nextFilter, IoSession session, WriteRequest writeRequest) throws Exception {
filter.messageSent(nextFilter, session, writeRequest);
}
/**
* {@inheritDoc}
*/
@Override
public void onPostAdd(IoFilterChain parent, String name, NextFilter nextFilter) throws Exception {
filter.onPostAdd(parent, name, nextFilter);
}
/**
* {@inheritDoc}
*/
@Override
public void onPreRemove(IoFilterChain parent, String name, NextFilter nextFilter) throws Exception {
filter.onPreRemove(parent, name, nextFilter);
}
/**
* {@inheritDoc}
*/
@Override
public void sessionClosed(NextFilter nextFilter, IoSession session) throws Exception {
filter.sessionClosed(nextFilter, session);
}
/**
* {@inheritDoc}
*/
@Override
public void sessionCreated(NextFilter nextFilter, IoSession session) throws Exception {
filter.sessionCreated(nextFilter, session);
}
/**
* {@inheritDoc}
*/
@Override
public void sessionIdle(NextFilter nextFilter, IoSession session, IdleStatus status) throws Exception {
filter.sessionIdle(nextFilter, session, status);
}
/**
* {@inheritDoc}
*/
@Override
public void sessionOpened(NextFilter nextFilter, IoSession session) throws Exception {
filter.sessionOpened(nextFilter, session);
}
}