001 // Copyright 2011 The Apache Software Foundation
002 //
003 // Licensed under the Apache License, Version 2.0 (the "License");
004 // you may not use this file except in compliance with the License.
005 // You may obtain a copy of the License at
006 //
007 // http://www.apache.org/licenses/LICENSE-2.0
008 //
009 // Unless required by applicable law or agreed to in writing, software
010 // distributed under the License is distributed on an "AS IS" BASIS,
011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012 // See the License for the specific language governing permissions and
013 // limitations under the License.
014
015 package org.apache.tapestry5.internal.alerts;
016
017 import org.apache.tapestry5.alerts.*;
018 import org.apache.tapestry5.ioc.services.PerThreadValue;
019 import org.apache.tapestry5.ioc.services.PerthreadManager;
020 import org.apache.tapestry5.services.ApplicationStateManager;
021 import org.apache.tapestry5.services.Request;
022 import org.apache.tapestry5.services.ajax.AjaxResponseRenderer;
023 import org.apache.tapestry5.services.ajax.JavaScriptCallback;
024 import org.apache.tapestry5.services.javascript.JavaScriptSupport;
025
026 public class AlertManagerImpl implements AlertManager
027 {
028 private final ApplicationStateManager asm;
029
030 private final Request request;
031
032 private final AjaxResponseRenderer ajaxResponseRenderer;
033
034 private final PerThreadValue<Boolean> needAlertStorageCleanup;
035
036 public AlertManagerImpl(ApplicationStateManager asm, Request request, AjaxResponseRenderer ajaxResponseRenderer, PerthreadManager perThreadManager)
037 {
038 this.asm = asm;
039 this.request = request;
040 this.ajaxResponseRenderer = ajaxResponseRenderer;
041
042 needAlertStorageCleanup = perThreadManager.createValue();
043 }
044
045 public void success(String message)
046 {
047 alert(Duration.SINGLE, Severity.SUCCESS, message);
048 }
049
050 public void info(String message)
051 {
052 alert(Duration.SINGLE, Severity.INFO, message);
053 }
054
055 public void warn(String message)
056 {
057 alert(Duration.SINGLE, Severity.WARN, message);
058 }
059
060 public void error(String message)
061 {
062 alert(Duration.SINGLE, Severity.ERROR, message);
063 }
064
065 public void alert(Duration duration, Severity severity, String message)
066 {
067 final Alert alert = new Alert(duration, severity, message);
068
069 if (request.isXHR())
070 {
071 addCallbackForAlert(alert);
072 }
073
074 // Add it to the storage; this is always done, even in an Ajax request, because we may end up
075 // redirecting to a new page, rather than doing a partial page update on the current page ... in which
076 // case we need the alerts stored persistently until we render the new page.
077
078 getAlertStorage().add(alert);
079 }
080
081 private void addCallbackForAlert(final Alert alert)
082 {
083 ajaxResponseRenderer.addCallback(new JavaScriptCallback()
084 {
085 public void run(JavaScriptSupport javascriptSupport)
086 {
087 javascriptSupport.addInitializerCall("addAlert", alert.toJSON());
088 }
089 });
090
091 addAlertStorageCleanupCallback();
092 }
093
094 private void addAlertStorageCleanupCallback()
095 {
096 // Add a callback that exists just to clear the non-persistent alerts.
097 // Only one of these is needed.
098
099 if (needAlertStorageCleanup.get(true))
100 {
101 ajaxResponseRenderer.addCallback(new JavaScriptCallback()
102 {
103 public void run(JavaScriptSupport javascriptSupport)
104 {
105 // In an Ajax request, the Alerts are added, just so that they can be removed if not persistent.
106 // Again, this is for the rare case where there's a redirect to another page.
107
108 getAlertStorage().dismissNonPersistent();
109 }
110 });
111
112 needAlertStorageCleanup.set(false);
113 }
114 }
115
116 private AlertStorage getAlertStorage()
117 {
118 return asm.get(AlertStorage.class);
119 }
120
121 }