| /* |
| * |
| * 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.qpid.ra; |
| |
| import java.util.Enumeration; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import javax.jms.JMSException; |
| import javax.jms.Queue; |
| import javax.jms.QueueBrowser; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * QpidRAQueueBrowser. |
| * |
| */ |
| public class QpidRAQueueBrowser implements QueueBrowser |
| { |
| /** The logger */ |
| private static final Logger _log = LoggerFactory.getLogger(QpidRAQueueBrowser.class); |
| |
| /** The wrapped queue browser */ |
| protected QueueBrowser _browser; |
| |
| /** The session for this consumer */ |
| protected QpidRASessionImpl _session; |
| |
| /** The closed flag */ |
| private AtomicBoolean _isClosed = new AtomicBoolean(); |
| |
| /** |
| * Create a new wrapper |
| * @param browser the browser |
| * @param session the session |
| */ |
| public QpidRAQueueBrowser(final QueueBrowser browser, final QpidRASessionImpl session) |
| { |
| _browser = browser; |
| _session = session; |
| |
| if (_log.isTraceEnabled()) |
| { |
| _log.trace("new QpidRAQueueBrowser " + this + |
| " browser=" + |
| Util.asString(browser) + |
| " session=" + |
| session); |
| } |
| } |
| |
| /** |
| * Close |
| * @exception JMSException Thrown if an error occurs |
| */ |
| public void close() throws JMSException |
| { |
| if (_log.isTraceEnabled()) |
| { |
| _log.trace("close " + this); |
| } |
| |
| if (!_isClosed.getAndSet(true)) |
| { |
| try |
| { |
| _browser.close(); |
| } |
| finally |
| { |
| _session.removeQueueBrowser(this); |
| } |
| } |
| } |
| |
| /** |
| * Get the queue associated with this browser. |
| * @return the associated queue. |
| */ |
| public Queue getQueue() |
| throws JMSException |
| { |
| return _browser.getQueue(); |
| } |
| |
| /** |
| * Get the message selector associated with this browser. |
| * @return the associated message selector. |
| */ |
| public String getMessageSelector() |
| throws JMSException |
| { |
| return _browser.getMessageSelector(); |
| } |
| |
| /** |
| * Get an enumeration for the current browser. |
| * @return The enumeration. |
| */ |
| public Enumeration getEnumeration() |
| throws JMSException |
| { |
| if (_log.isTraceEnabled()) |
| { |
| _log.trace("getEnumeration " + this + " browser=" + Util.asString(_browser)); |
| } |
| |
| _session.lock(); |
| try |
| { |
| _session.checkState(); |
| return _browser.getEnumeration(); |
| } |
| finally |
| { |
| _session.unlock(); |
| } |
| } |
| } |