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 info(String message)
046 {
047 alert(Duration.SINGLE, Severity.INFO, message);
048 }
049
050 public void warn(String message)
051 {
052 alert(Duration.SINGLE, Severity.WARN, message);
053 }
054
055 public void error(String message)
056 {
057 alert(Duration.SINGLE, Severity.ERROR, message);
058 }
059
060 public void alert(Duration duration, Severity severity, String message)
061 {
062 final Alert alert = new Alert(duration, severity, message);
063
064 if (request.isXHR())
065 {
066 addCallbackForAlert(alert);
067 }
068
069 // Add it to the storage; this is always done, even in an Ajax request, because we may end up
070 // redirecting to a new page, rather than doing a partial page update on the current page ... in which
071 // case we need the alerts stored persistently until we render the new page.
072
073 getAlertStorage().add(alert);
074 }
075
076 private void addCallbackForAlert(final Alert alert)
077 {
078 ajaxResponseRenderer.addCallback(new JavaScriptCallback()
079 {
080 public void run(JavaScriptSupport javascriptSupport)
081 {
082 javascriptSupport.addInitializerCall("addAlert", alert.toJSON());
083 }
084 });
085
086 addAlertStorageCleanupCallback();
087 }
088
089 private void addAlertStorageCleanupCallback()
090 {
091 // Add a callback that exists just to clear the non-persistent alerts.
092 // Only one of these is needed.
093
094 if (needAlertStorageCleanup.get(true))
095 {
096 ajaxResponseRenderer.addCallback(new JavaScriptCallback()
097 {
098 public void run(JavaScriptSupport javascriptSupport)
099 {
100 // In an Ajax request, the Alerts are added, just so that they can be removed if not persistent.
101 // Again, this is for the rare case where there's a redirect to another page.
102
103 getAlertStorage().dismissNonPersistent();
104 }
105 });
106
107 needAlertStorageCleanup.set(false);
108 }
109 }
110
111 private AlertStorage getAlertStorage()
112 {
113 return asm.get(AlertStorage.class);
114 }
115
116 }