Consistent naming for EIP patterns #733

eip-publish-subscribe/src/main/java/com/iluwatar/eip/publish/subscribe/App.java

@@ -0,0 +1,72 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014-2016 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package com.iluwatar.eip.publish.subscribe;
+
+import org.apache.camel.CamelContext;
+import org.apache.camel.ProducerTemplate;
+import org.apache.camel.builder.RouteBuilder;
+import org.apache.camel.impl.DefaultCamelContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * 
+ * There are well-established patterns for implementing broadcasting. The Observer pattern describes
+ * the need to decouple observers from their subject (that is, the originator of the event) so that
+ * the subject can easily provide event notification to all interested observers no matter how many
+ * observers there are (even none). The Publish-Subscribe pattern expands upon Observer by adding
+ * the notion of an event channel for communicating event notifications.
+ * <p>
+ * A Publish-Subscribe Channel works like this: It has one input channel that splits into multiple
+ * output channels, one for each subscriber. When an event is published into the channel, the
+ * Publish-Subscribe Channel delivers a copy of the message to each of the output channels. Each
+ * output end of the channel has only one subscriber, which is allowed to consume a message only
+ * once. In this way, each subscriber gets the message only once, and consumed copies disappear from
+ * their channels.
+ * <p>
+ * In this example we use Apache Camel to establish a Publish-Subscribe Channel from "direct-origin"
+ * to "mock:foo", "mock:bar" and "stream:out".
+ * 
+ */
+public class App {
+
+  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
+
+  /**
+   * Program entry point
+   */
+  public static void main(String[] args) throws Exception {
+    CamelContext context = new DefaultCamelContext();
+    context.addRoutes(new RouteBuilder() {
+      @Override
+      public void configure() throws Exception {
+        from("direct:origin").multicast().to("mock:foo", "mock:bar", "stream:out");
+      }
+    });
+    ProducerTemplate template = context.createProducerTemplate();
+    context.start();
+    context.getRoutes().stream().forEach(r -> LOGGER.info(r.toString()));
+    template.sendBody("direct:origin", "Hello from origin");
+    context.stop();
+  }
+}

eip-publish-subscribe/src/main/resources/logback.xml

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+<!--
+
+    The MIT License
+    Copyright (c) 2014-2016 Ilkka Seppälä
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+
+-->
+<configuration>
+    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
+        <file>publish-subscribe.log</file>
+        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
+            <fileNamePattern>publish-subscribe-%d.log</fileNamePattern>
+            <maxHistory>5</maxHistory>
+        </rollingPolicy>
+        <encoder>
+            <pattern>%-5p [%d{ISO8601,UTC}] %c: %m%n</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%-5p [%d{ISO8601,UTC}] %c: %m%n</pattern>
+        </encoder>
+    </appender>
+
+    <logger name="com.iluwatar" additivity="false">
+        <level value="DEBUG"/>
+        <appender-ref ref="FILE"/>
+    </logger>
+
+    <root level="WARN">
+        <appender-ref ref="STDOUT"/>
+    </root>
+
+</configuration>

eip-publish-subscribe/src/test/java/com/iluwatar/eip/publish/subscribe/AppTest.java

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+/**
+ * The MIT License
+ * Copyright (c) 2014-2016 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package com.iluwatar.eip.publish.subscribe;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * 
+ * Application test
+ *
+ */
+public class AppTest {
+
+  @Test
+  public void test() throws Exception {
+    String[] args = {};
+    App.main(args);
+  }
+}