Add RemindingNotifier

The RemindingNotifier sends periodic notifications using a delegate. It must be
added explicitly to the ApplicationContext

spring-boot-admin-docs/src/main/asciidoc/index.adoc

@@ -103,7 +103,7 @@ Also have a look at the http://projects.spring.io/spring-cloud/spring-cloud.html
 <dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-eureka</artifactId>
-    <version>1.0.4.RELEASE</version>
+    <version>1.0.6.RELEASE</version>
 </dependency>
 ----
 
@@ -228,7 +228,7 @@ spring.boot.admin.password
 | `${spring.application.name}` if set, `"spring-boot-application"` otherwise.
 
 | spring.boot.admin.client.prefer-ip
-| Use the ip-address rather then the hostname in the guessed urls. If `server.address` / `management.address` is set they get used otherwise the IP address returned from `InetAddress.getLocalHost()` gets used.
+| Use the ip-address rather then the hostname in the guessed urls. If `server.address` / `management.address` is set, it get used. Otherwise the IP address returned from `InetAddress.getLocalHost()` gets used.
 | `false`
 |===
 
@@ -332,8 +332,10 @@ public class SpringBootAdminApplication {
 | `"spring-boot-admin-event-store"`
 |===
 
+=== Notifications ===
+
 [[mail-notifications]]
-=== Mail notifications ===
+==== Mail notifications ====
 
 Configure a `JavaMailSender` using `spring-boot-starter-mail` and set a recipient.
 
@@ -385,9 +387,8 @@ spring.boot.admin.notify.mail.to=admin@example.com
 | `+++"#{application.name} (#{application.id})\nstatus changed from #{from.status} to #{to.status}\n\n#{application.healthUrl}"+++`
 |===
 
-
 [[pagerduty-notifications]]
-=== Pagerduty notifications ===
+==== Pagerduty notifications ====
 To enable pagerduty notifications you just have to add a generic service to your pagerduty-account and set `spring.boot.admin.notify.pagerduty.service-key` to the service-key you received.
 
 .Pagerduty notifications configuration options
@@ -423,6 +424,36 @@ To enable pagerduty notifications you just have to add a generic service to your
 |
 |===
 
+[reminder-notifactaions]
+==== Reminder notifications ====
+To get reminders for down/offline applications you can add a `RemindingNotifier` to your `ApplicationContext`. The `RemindingNotifier` uses another `Notifier` as delegate to send the reminders.
+
+.How to configure reminders
+[source,java]
+----
+@Configuration
+public class ReminderConfiguration {
+    @Autowired
+    private Notifier notifier;
+
+    @Bean
+    @Primary
+    public RemindingNotifier remindingNotifier() {
+        RemindingNotifier remindingNotifier = new RemindingNotifier(notifier);
+        remindingNotifier.setReminderPeriod(TimeUnit.MINUTES.toMillis(5)); // <1>
+        return remindingNotifier;
+    }
+
+    @Scheduled(fixedRate = 6000L) // <2>
+    public void remind() {
+        remindingNotifier().sendReminders();
+    }
+}
+----
+<1> The reminders will be sent every 5 minutes.
+<2> Schedules sending of due reminders every 60 seconds.
+
+
 [[faqs]]
 == FAQs ==
 [qanda]

spring-boot-admin-server/src/main/java/de/codecentric/boot/admin/config/AdminServerImportSelector.java

@@ -28,12 +28,11 @@ public class AdminServerImportSelector implements DeferredImportSelector {
 
 	@Override
 	public String[] selectImports(AnnotationMetadata importingClassMetadata) {
-		return new String[] { MailNotifierConfiguration.class.getCanonicalName(),
+		return new String[] { NotifierConfiguration.class.getCanonicalName(),
 				HazelcastStoreConfiguration.class.getCanonicalName(),
 				AdminServerWebConfiguration.class.getCanonicalName(),
 				DiscoveryClientConfiguration.class.getCanonicalName(),
-				RevereseZuulProxyConfiguration.class.getCanonicalName(),
-				PagerdutyNotifierConfiguration.class.getCanonicalName() };
+				RevereseZuulProxyConfiguration.class.getCanonicalName() };
 	}
 
 }

spring-boot-admin-server/src/main/java/de/codecentric/boot/admin/config/NotifierConfiguration.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2013-2014 the original author or authors.
+ *
+ * Licensed 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 de.codecentric.boot.admin.config;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.AutoConfigureAfter;
+import org.springframework.boot.autoconfigure.AutoConfigureBefore;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.autoconfigure.mail.MailSenderAutoConfiguration;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.mail.MailSender;
+
+import de.codecentric.boot.admin.notify.MailNotifier;
+import de.codecentric.boot.admin.notify.Notifier;
+import de.codecentric.boot.admin.notify.NotifierListener;
+import de.codecentric.boot.admin.notify.PagerdutyNotifier;
+
+@Configuration
+public class NotifierConfiguration {
+
+	@Configuration
+	@ConditionalOnBean(Notifier.class)
+	public static class NotifierListenerConfiguration {
+		@Autowired
+		public Notifier notifier;
+
+		@Bean
+		@ConditionalOnMissingBean
+		public NotifierListener notifierListener() {
+			return new NotifierListener(notifier);
+		}
+	}
+
+	@Configuration
+	@ConditionalOnBean(MailSender.class)
+	@AutoConfigureAfter({ MailSenderAutoConfiguration.class })
+	@AutoConfigureBefore({ NotifierListenerConfiguration.class })
+	public static class MailNotifierConfiguration {
+		@Autowired
+		private MailSender mailSender;
+
+		@Bean
+		@ConditionalOnMissingBean
+		@ConditionalOnProperty(prefix = "spring.boot.admin.notify.mail", name = "enabled", matchIfMissing = true)
+		@ConfigurationProperties("spring.boot.admin.notify.mail")
+		public MailNotifier mailNotifier() {
+			return new MailNotifier(mailSender);
+		}
+	}
+
+	@Configuration
+	@ConditionalOnProperty(prefix = "spring.boot.admin.notify.pagerduty", name = "service-key")
+	@AutoConfigureBefore({ NotifierListenerConfiguration.class })
+	public static class PagerdutyNotifierConfiguration {
+		@Bean
+		@ConditionalOnMissingBean
+		@ConditionalOnProperty(prefix = "spring.boot.admin.notify.pagerduty", name = "enabled", matchIfMissing = true)
+		@ConfigurationProperties("spring.boot.admin.notify.pagerduty")
+		public PagerdutyNotifier pagerdutyNotifier() {
+			return new PagerdutyNotifier();
+		}
+	}
+}