Merge branch 'master' of https://github.com/JonCook/tutorials

vertx-and-rxjava/.gitignore

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+/.vertx

vertx-and-rxjava/README.md

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+## Vert.x and RxJava
+
+This module contains articles about RxJava with Vert.x
+
+### Relevant articles
+- [Example of Vertx and RxJava Integration](https://www.baeldung.com/vertx-rx-java)

vertx-and-rxjava/pom.xml

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+<?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/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>vertx-and-rxjava</artifactId>
+	<name>vertx-and-rxjava</name>
+	
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-rx-java2</artifactId>
+            <version>${vertx.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-core</artifactId>
+            <version>${vertx.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-unit</artifactId>
+            <version>${vertx.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <vertx.version>3.5.0.Beta1</vertx.version>
+        <logback.version>1.2.3</logback.version>
+    </properties>
+
+</project>

vertx-and-rxjava/pom.xml.orig

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+<?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/xsd/maven-4.0.0.xsd">
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung</groupId>
+    <artifactId>vertx-and-rxjava</artifactId>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-rx-java2</artifactId>
+            <version>3.5.0.Beta1</version>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-core</artifactId>
+            <version>3.5.0.Beta1</version>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-unit</artifactId>
+            <version>3.5.0.Beta1</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>1.7.25</version>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>1.2.3</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+        </dependency>
+
+    </dependencies>
+
+</project>

vertx-and-rxjava/src/test/java/com/baeldung/weather/CityAndDayLength.java

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+package com.baeldung.weather;
+
+import java.text.MessageFormat;
+
+class CityAndDayLength {
+
+    private final String city;
+    private final double dayLengthInHours;
+
+    CityAndDayLength(String city, long dayLengthInSeconds) {
+        this.city = city;
+        this.dayLengthInHours = dayLengthInSeconds / (60.0 * 60.0);
+    }
+
+    @Override
+    public String toString() {
+        return MessageFormat.format("In {0} there are {1,number,#0.0} hours of light.", city, dayLengthInHours);
+    }
+}

vertx-and-rxjava/src/test/java/com/baeldung/weather/MetaWeatherClient.java

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+package com.baeldung.weather;
+
+import io.reactivex.Flowable;
+import io.vertx.core.http.RequestOptions;
+import io.vertx.reactivex.core.http.HttpClient;
+import io.vertx.reactivex.core.http.HttpClientRequest;
+import io.vertx.reactivex.core.http.HttpClientResponse;
+
+import static java.lang.String.format;
+
+class MetaWeatherClient {
+
+    private static RequestOptions metawether = new RequestOptions()
+      .setHost("www.metaweather.com")
+      .setPort(443)
+      .setSsl(true);
+
+    /**
+     * @return A flowable backed by vertx that automatically sends an HTTP request at soon as the first subscription is received.
+     */
+    private static Flowable<HttpClientResponse> autoPerformingReq(HttpClient httpClient, String uri) {
+        HttpClientRequest req = httpClient.get(new RequestOptions(metawether).setURI(uri));
+        return req.toFlowable()
+          .doOnSubscribe(subscription -> req.end());
+    }
+
+    static Flowable<HttpClientResponse> searchByCityName(HttpClient httpClient, String cityName) {
+        HttpClientRequest req = httpClient.get(
+          new RequestOptions()
+            .setHost("www.metaweather.com")
+            .setPort(443)
+            .setSsl(true)
+            .setURI(format("/api/location/search/?query=%s", cityName)));
+        return req
+          .toFlowable()
+          .doOnSubscribe(subscription -> req.end());
+    }
+
+    static Flowable<HttpClientResponse> getDataByPlaceId(HttpClient httpClient, long placeId) {
+        return autoPerformingReq(
+          httpClient,
+          format("/api/location/%s/", placeId));
+    }
+
+}

vertx-and-rxjava/src/test/java/com/baeldung/weather/VertxWithRxJavaIntegrationTest.java

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+package com.baeldung.weather;
+
+import io.reactivex.Flowable;
+import io.reactivex.functions.Function;
+import io.vertx.core.json.JsonObject;
+import io.vertx.reactivex.core.Vertx;
+import io.vertx.reactivex.core.buffer.Buffer;
+import io.vertx.reactivex.core.file.FileSystem;
+import io.vertx.reactivex.core.http.HttpClient;
+import io.vertx.reactivex.core.http.HttpClientResponse;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.reactivestreams.Publisher;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.time.ZonedDateTime;
+
+import static com.baeldung.weather.MetaWeatherClient.getDataByPlaceId;
+import static com.baeldung.weather.MetaWeatherClient.searchByCityName;
+
+public class VertxWithRxJavaIntegrationTest {
+
+    private Vertx vertx;
+    private HttpClient httpClient;
+    private FileSystem fileSystem;
+    private static Logger log = LoggerFactory.getLogger(VertxWithRxJavaIntegrationTest.class);
+
+    @Before
+    public void setUp() {
+        vertx = Vertx.vertx();
+        httpClient = vertx.createHttpClient();
+        fileSystem = vertx.fileSystem();
+    }
+
+    @After
+    public void tearDown() {
+        vertx.close();
+    }
+
+    @Test
+    public void shouldDisplayLightLenghts() throws InterruptedException {
+
+        // read the file that contains one city name per line
+        fileSystem
+          .rxReadFile("cities.txt").toFlowable()
+            .doOnNext(buffer -> log.info("File buffer ---\n{}\n---", buffer))
+          .flatMap(buffer -> Flowable.fromArray(buffer.toString().split("\\r?\\n")))
+            .doOnNext(city -> log.info("City from file: '{}'", city))
+          .filter(city -> !city.startsWith("#"))
+            .doOnNext(city -> log.info("City that survived filtering: '{}'", city))
+          .flatMap(city -> searchByCityName(httpClient, city))
+          .flatMap(HttpClientResponse::toFlowable)
+            .doOnNext(buffer -> log.info("JSON of city detail: '{}'", buffer))
+          .map(extractingWoeid())
+          .flatMap(cityId -> getDataByPlaceId(httpClient, cityId))
+          .flatMap(toBufferFlowable())
+            .doOnNext(buffer -> log.info("JSON of place detail: '{}'", buffer))
+          .map(Buffer::toJsonObject)
+          .map(toCityAndDayLength())
+          .subscribe(System.out::println, Throwable::printStackTrace);
+
+        Thread.sleep(20000);  // enough to give time to complete the execution
+    }
+
+    private static Function<HttpClientResponse, Publisher<? extends Buffer>> toBufferFlowable() {
+        return response -> response
+          .toObservable()
+          .reduce(
+            Buffer.buffer(),
+            Buffer::appendBuffer).toFlowable();
+    }
+
+    private static Function<Buffer, Long> extractingWoeid() {
+        return cityBuffer -> cityBuffer
+          .toJsonArray()
+          .getJsonObject(0)
+          .getLong("woeid");
+    }
+
+    private static Function<JsonObject, CityAndDayLength> toCityAndDayLength() {
+        return json -> {
+            ZonedDateTime sunRise = ZonedDateTime.parse(json.getString("sun_rise"));
+            ZonedDateTime sunSet = ZonedDateTime.parse(json.getString("sun_set"));
+            String cityName = json.getString("title");
+            return new CityAndDayLength(
+              cityName, sunSet.toEpochSecond() - sunRise.toEpochSecond());
+        };
+    }
+
+}

vertx-and-rxjava/src/test/resources/cities.txt

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+Milan
+Chicago
+Cairo
+Santiago
+Moscow
+Auckland

vertx-and-rxjava/src/test/resources/logback-test.xml

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+<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="warn">
+        <appender-ref ref="STDOUT" />
+    </root>
+
+</configuration>