Merge pull request #9170 from mdabrowski-eu/BAEL-3863

BAEL-3863 Introduction to Finagle

libraries-rpc/pom.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>libraries-rpc</artifactId>
+    <name>libraries-rpc</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+      <dependency>
+        <groupId>com.twitter</groupId>
+        <artifactId>finagle-core_2.13</artifactId>
+        <version>${finagle.core.version}</version>
+      </dependency>
+      <dependency>
+          <groupId>com.twitter</groupId>
+          <artifactId>finagle-http_2.13</artifactId>
+          <version>${finagle.http.version}</version>
+      </dependency>
+
+    </dependencies>
+
+    <properties>
+        <finagle.core.version>20.4.0</finagle.core.version>
+        <finagle.http.version>20.4.0</finagle.http.version>
+    </properties>
+
+
+</project>

libraries-rpc/src/main/java/com/baeldung/rpc/finagle/GreetingService.java

@@ -0,0 +1,18 @@
+package com.baeldung.rpc.finagle;
+
+import com.twitter.finagle.Service;
+import com.twitter.finagle.http.Request;
+import com.twitter.finagle.http.Response;
+import com.twitter.finagle.http.Status;
+import com.twitter.io.Buf;
+import com.twitter.io.Reader;
+import com.twitter.util.Future;
+
+public class GreetingService extends Service<Request, Response> {
+    @Override
+    public Future<Response> apply(Request request) {
+        String greeting = "Hello " + request.getParam("name");
+        Reader<Buf> reader = Reader.fromBuf(new Buf.ByteArray(greeting.getBytes(), 0, greeting.length()));
+        return Future.value(Response.apply(request.version(), Status.Ok(), reader));
+    }
+}

libraries-rpc/src/main/java/com/baeldung/rpc/finagle/LogFilter.java

@@ -0,0 +1,22 @@
+package com.baeldung.rpc.finagle;
+
+import com.twitter.finagle.Service;
+import com.twitter.finagle.SimpleFilter;
+import com.twitter.finagle.http.Request;
+import com.twitter.finagle.http.Response;
+import com.twitter.util.Future;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class LogFilter extends SimpleFilter<Request, Response> {
+
+    private static final Logger logger = LoggerFactory.getLogger(LogFilter.class);
+
+    @Override
+    public Future<Response> apply(Request request, Service<Request, Response> service) {
+        logger.info("Request host:" + request.host().getOrElse(() -> ""));
+        logger.info("Request params:");
+        request.getParams().forEach(entry -> logger.info("\t" + entry.getKey() + " : " + entry.getValue()));
+        return service.apply(request);
+    }
+}

libraries-rpc/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

libraries-rpc/src/test/java/com/baeldung/rpc/finagle/FinagleIntegrationTest.java

@@ -0,0 +1,40 @@
+package com.baeldung.rpc.finagle;
+
+import com.twitter.finagle.Http;
+import com.twitter.finagle.Service;
+import com.twitter.finagle.http.Method;
+import com.twitter.finagle.http.Request;
+import com.twitter.finagle.http.Response;
+import com.twitter.util.Await;
+import com.twitter.util.Future;
+import org.junit.Test;
+import scala.runtime.BoxedUnit;
+
+import static org.junit.Assert.assertEquals;
+
+public class FinagleIntegrationTest {
+    @Test
+    public void givenServerAndClient_whenRequestSent_thenClientShouldReceiveResponseFromServer() throws Exception {
+        // given
+        Service serverService = new LogFilter().andThen(new GreetingService());
+        Http.serve(":8080", serverService);
+
+        Service<Request, Response> clientService = new LogFilter().andThen(Http.newService(":8080"));
+
+        // when
+        Request request = Request.apply(Method.Get(), "/?name=John");
+        request.host("localhost");
+        Future<Response> response = clientService.apply(request);
+
+        // then
+        Await.result(response
+                .onSuccess(r -> {
+                    assertEquals("Hello John", r.getContentString());
+                    return BoxedUnit.UNIT;
+                })
+                .onFailure(r -> {
+                    throw new RuntimeException(r);
+                })
+        );
+    }
+}

pom.xml

@@ -509,6 +509,7 @@
                 <module>libraries-http-2</module>
                 <module>libraries-io</module>
                 <module>libraries-primitive</module>
+                <module>libraries-rpc</module>
                 <module>libraries-security</module>
                 <module>libraries-server</module>
                 <module>libraries-testing</module>