1 /*** 2 * 3 * Copyright 2004 Protique Ltd 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 **/ 18 19 package org.codehaus.activemq.transport.reliable; 20 21 import org.codehaus.activemq.message.WireFormat; 22 import org.codehaus.activemq.transport.TransportChannel; 23 import org.codehaus.activemq.transport.composite.CompositeTransportChannelFactory; 24 import org.codehaus.activemq.util.JMSExceptionHelper; 25 26 import javax.jms.JMSException; 27 import java.net.URI; 28 import java.net.URISyntaxException; 29 import java.util.ArrayList; 30 import java.util.Arrays; 31 import java.util.List; 32 33 /*** 34 * A Reliable implementation of a TransportChannelFactory 35 * 36 * @version $Revision: 1.2 $ 37 */ 38 public class ReliableTransportChannelFactory extends CompositeTransportChannelFactory { 39 ; 40 41 /*** 42 * Create a TransportChannel 43 * 44 * @param wireFormat - the on-the-wire marshaller 45 * @param remoteLocation - location to bind to 46 * @return a reliable transport channel 47 * @throws JMSException if an error occurs 48 */ 49 public TransportChannel create(WireFormat wireFormat, URI remoteLocation) throws JMSException { 50 try { 51 return new ReliableTransportChannel(wireFormat, parseURIs(remoteLocation)); 52 } 53 catch (URISyntaxException e) { 54 throw JMSExceptionHelper.newJMSException("Can't parse list of URIs for: " + remoteLocation + ". Reason: " 55 + e, e); 56 } 57 } 58 59 /*** 60 * @param uris - the URIs to randomize 61 * @return randomized array 62 */ 63 protected List randomizeURIs(List uris) { 64 if (!uris.isEmpty()) { 65 int size = uris.size(); 66 Object[] result = new Object[size]; 67 SMLCGRandom random = new SMLCGRandom(); 68 int startIndex = (int) (random.nextDouble() * (size + 1)); 69 int count = 0; 70 for (int i = startIndex; i < size; i++) { 71 result[count++] = uris.get(i); 72 } 73 for (int i = 0; i < startIndex; i++) { 74 result[count++] = uris.get(i); 75 } 76 return new ArrayList(Arrays.asList(result)); 77 } 78 return uris; 79 } 80 }