001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.servicemix.jbi.view;
018
019 import javax.jbi.servicedesc.ServiceEndpoint;
020
021 import org.apache.commons.logging.Log;
022 import org.apache.commons.logging.LogFactory;
023 import org.apache.servicemix.jbi.event.EndpointEvent;
024 import org.apache.servicemix.jbi.event.EndpointListener;
025
026 /**
027 * A base class for renderings of endpoints which can re-render whenever something
028 * changes or mark things as dirty so that they can be re-rendered on demand or in a time based way
029 *
030 * @version $Revision: 564607 $
031 */
032 public abstract class EndpointViewRenderer implements EndpointListener {
033
034 private static final Log LOG = LogFactory.getLog(EndpointViewRenderer.class);
035
036 private boolean dirty;
037 private boolean rerenderOnChange = true;
038
039 public void render() throws Exception {
040 doRender();
041 dirty = false;
042 }
043
044 public void internalEndpointRegistered(EndpointEvent event) {
045 viewIsDirty(event.getEndpoint());
046 }
047
048 public void internalEndpointUnregistered(EndpointEvent event) {
049 viewIsDirty(event.getEndpoint());
050 }
051
052 public void externalEndpointRegistered(EndpointEvent event) {
053 viewIsDirty(event.getEndpoint());
054 }
055
056 public void externalEndpointUnregistered(EndpointEvent event) {
057 viewIsDirty(event.getEndpoint());
058 }
059
060 public void linkedEndpointRegistered(EndpointEvent event) {
061 viewIsDirty(event.getEndpoint());
062 }
063
064 public void linkedEndpointUnregistered(EndpointEvent event) {
065 viewIsDirty(event.getEndpoint());
066 }
067
068 public void remoteEndpointRegistered(EndpointEvent event) {
069 viewIsDirty(event.getEndpoint());
070 }
071
072 public void remoteEndpointUnregistered(EndpointEvent event) {
073 viewIsDirty(event.getEndpoint());
074 }
075
076 // Properties
077 // -------------------------------------------------------------------------
078 public boolean isRerenderOnChange() {
079 return rerenderOnChange;
080 }
081
082 public void setRerenderOnChange(boolean rerenderOnChange) {
083 this.rerenderOnChange = rerenderOnChange;
084 }
085
086 public boolean isDirty() {
087 return dirty;
088 }
089
090 // Implementation methods
091 // -------------------------------------------------------------------------
092 protected abstract void doRender() throws Exception;
093
094 protected void viewIsDirty(ServiceEndpoint endpoint) {
095 dirty = true;
096 if (rerenderOnChange) {
097 try {
098 render();
099 } catch (Exception e) {
100 LOG.warn("Failed to render view: " + e, e);
101 }
102 }
103 }
104
105 }