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/*
*
* Copyright (c) 2006 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.qpid.server.queue;
import org.apache.qpid.server.exchange.Exchange;
import org.apache.qpid.AMQException;
import java.util.List;
import java.util.HashSet;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* When a queue is deleted, it should be deregistered from any
* exchange it has been bound to. This class assists in this task,
* by keeping track of all bindings for a given queue.
*/
class ExchangeBindings
{
static class ExchangeBinding
{
private final Exchange exchange;
private final String routingKey;
ExchangeBinding(String routingKey, Exchange exchange)
{
this.routingKey = routingKey;
this.exchange = exchange;
}
void unbind(AMQQueue queue) throws AMQException
{
exchange.deregisterQueue(routingKey, queue);
}
public Exchange getExchange()
{
return exchange;
}
public String getRoutingKey()
{
return routingKey;
}
public int hashCode()
{
return exchange.hashCode() + routingKey.hashCode();
}
public boolean equals(Object o)
{
if (!(o instanceof ExchangeBinding)) return false;
ExchangeBinding eb = (ExchangeBinding) o;
return exchange.equals(eb.exchange) && routingKey.equals(eb.routingKey);
}
}
private final List<ExchangeBinding> _bindings = new CopyOnWriteArrayList<ExchangeBinding>();
private final AMQQueue _queue;
ExchangeBindings(AMQQueue queue)
{
_queue = queue;
}
/**
* Adds the specified binding to those being tracked.
* @param routingKey the routing key with which the queue whose bindings
* are being tracked by the instance has been bound to the exchange
* @param exchange the exchange bound to
*/
void addBinding(String routingKey, Exchange exchange)
{
_bindings.add(new ExchangeBinding(routingKey, exchange));
}
/**
* Deregisters this queue from any exchange it has been bound to
*/
void deregister() throws AMQException
{
//remove duplicates at this point
HashSet<ExchangeBinding> copy = new HashSet<ExchangeBinding>(_bindings);
for (ExchangeBinding b : copy)
{
b.unbind(_queue);
}
}
List<ExchangeBinding> getExchangeBindings()
{
return _bindings;
}
}
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