Merge branch 'master' of https://github.com/raksha-rao/tutorials
This commit is contained in:
Raksha Rao
commit
b21a3705b6
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@ -2,11 +2,12 @@ package com.baeldung.spliteratorAPI;
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import java.util.List;
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import java.util.Spliterator;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.function.Consumer;
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public class RelatedAuthorSpliterator implements Spliterator<Author> {
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private final List<Author> list;
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private int current = 0;
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AtomicInteger current = new AtomicInteger();
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public RelatedAuthorSpliterator(List<Author> list) {
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this.list = list;
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@ -14,21 +15,21 @@ public class RelatedAuthorSpliterator implements Spliterator<Author> {
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@Override
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public boolean tryAdvance(Consumer<? super Author> action) {
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action.accept(list.get(current++));
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return current < list.size();
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action.accept(list.get(current.getAndIncrement()));
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return current.get() < list.size();
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}
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@Override
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public Spliterator<Author> trySplit() {
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int currentSize = list.size() - current;
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int currentSize = list.size() - current.get();
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if (currentSize < 10) {
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return null;
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}
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for (int splitPos = currentSize / 2 + current; splitPos < list.size(); splitPos++) {
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if (list.get(splitPos)
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.getRelatedArticleId() == 0) {
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Spliterator<Author> spliterator = new RelatedAuthorSpliterator(list.subList(current, splitPos));
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current = splitPos;
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for (int splitPos = currentSize / 2 + current.intValue(); splitPos < list.size(); splitPos++) {
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if (list.get(splitPos).getRelatedArticleId() == 0) {
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Spliterator<Author> spliterator = new RelatedAuthorSpliterator(list.subList(current.get(), splitPos));
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current.set(splitPos);
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return spliterator;
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}
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}
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@ -37,11 +38,12 @@ public class RelatedAuthorSpliterator implements Spliterator<Author> {
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@Override
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public long estimateSize() {
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return list.size() - current;
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return list.size() - current.get();
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}
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@Override
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public int characteristics() {
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return SIZED + CONCURRENT;
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return CONCURRENT;
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}
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}
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@ -2,22 +2,25 @@ package com.baeldung.reactive.websocket;
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import java.net.URI;
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import java.time.Duration;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.web.reactive.socket.WebSocketMessage;
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import org.springframework.web.reactive.socket.client.ReactorNettyWebSocketClient;
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import org.springframework.web.reactive.socket.client.WebSocketClient;
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import reactor.core.publisher.Mono;
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@SpringBootApplication
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public class ReactiveJavaClientWebSocket {
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public static void main(String[] args) throws InterruptedException {
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WebSocketClient client = new ReactorNettyWebSocketClient();
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client.execute(URI.create("ws://localhost:8080/event-emitter"), session -> session.send(Mono.just(session.textMessage("event-me-from-spring-reactive-client")))
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client.execute(
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URI.create("ws://localhost:8080/event-emitter"),
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session -> session.send(
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Mono.just(session.textMessage("event-spring-reactive-client-websocket")))
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.thenMany(session.receive()
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.map(WebSocketMessage::getPayloadAsText)
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.log())
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.then())
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.block(Duration.ofSeconds(10L));
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}
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}
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@ -12,7 +12,6 @@ import org.springframework.web.reactive.socket.WebSocketMessage;
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import reactor.core.publisher.Flux;
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import reactor.core.publisher.Mono;
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import javax.annotation.PostConstruct;
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import java.time.Duration;
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import java.time.LocalDateTime;
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import java.util.UUID;
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@ -20,37 +19,18 @@ import java.util.UUID;
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@Component
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public class ReactiveWebSocketHandler implements WebSocketHandler {
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private Flux<Event> eventFlux;
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private Flux<Event> intervalFlux;
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/**
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* Here we prepare a Flux that will emit a message every second
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*/
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@PostConstruct
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private void init() throws InterruptedException {
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eventFlux = Flux.generate(e -> {
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Event event = new Event(UUID.randomUUID()
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.toString(),
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LocalDateTime.now()
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.toString());
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private Flux<Event> eventFlux = Flux.generate(e -> {
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Event event = new Event(UUID.randomUUID().toString(), LocalDateTime.now().toString());
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e.next(event);
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});
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intervalFlux = Flux.interval(Duration.ofMillis(1000L))
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.zipWith(eventFlux, (time, event) -> event);
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private Flux<Event> intervalFlux = Flux.interval(Duration.ofMillis(1000L)).zipWith(eventFlux, (time, event) -> event);
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}
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private ObjectMapper json = new ObjectMapper();
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/**
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* On each new client session, send the message flux to the client.
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* Spring subscribes to the flux and send every new flux event to the WebSocketSession object
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* @param session
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* @return Mono<Void>
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*/
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@Override
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public Mono<Void> handle(WebSocketSession webSocketSession) {
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ObjectMapper json = new ObjectMapper();
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return webSocketSession.send(intervalFlux.map(event -> {
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try {
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String jsonEvent = json.writeValueAsString(event);
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@ -60,12 +40,9 @@ public class ReactiveWebSocketHandler implements WebSocketHandler {
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e.printStackTrace();
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return "";
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}
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})
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.map(webSocketSession::textMessage))
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}).map(webSocketSession::textMessage))
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.and(webSocketSession.receive()
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.map(WebSocketMessage::getPayloadAsText)
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.log());
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.and(webSocketSession.receive().map(WebSocketMessage::getPayloadAsText).log());
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}
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}
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@ -12,13 +12,11 @@
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Client-side service discovery allows services to find and communicate with each other without hardcoding hostname and port. The only ‘fixed point’ in such an architecture consists of a service registry with which each service has to register.
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### Relevant Articles:
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- [Intro to Spring Cloud Netflix - Hystrix](http://www.baeldung.com/spring-cloud-netflix-hystrix)
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- [Dockerizing a Spring Boot Application](http://www.baeldung.com/dockerizing-spring-boot-application)
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- [Introduction to Spring Cloud Rest Client with Netflix Ribbon](http://www.baeldung.com/spring-cloud-rest-client-with-netflix-ribbon)
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- [A Quick Guide to Spring Cloud Consul](http://www.baeldung.com/spring-cloud-consul)
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### Relevant Articles:
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- [Introduction to Spring Cloud Rest Client with Netflix Ribbon](http://www.baeldung.com/spring-cloud-rest-client-with-netflix-ribbon)
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- [An Introduction to Spring Cloud Zookeeper](http://www.baeldung.com/spring-cloud-zookeeper)
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- [Using a Spring Cloud App Starter](http://www.baeldung.com/using-a-spring-cloud-app-starter)
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- [Spring Cloud Connectors and Heroku](http://www.baeldung.com/spring-cloud-heroku)
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@ -0,0 +1,46 @@
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#!/usr/bin/env bash
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# For Ubuntu 14.04
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# Inspired from: https://github.com/curran/setupHadoop/blob/master/setupHadoop.sh
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# Use from the user directory
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# Install Java
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sudo apt-get update
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sudo add-apt-repository -y ppa:webupd8team/java
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sudo apt-get install -y oracle-java8-installer
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# Install Hadoop
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curl -O http://mirror.cogentco.com/pub/apache/hadoop/common/hadoop-2.8.2/hadoop-2.8.2.tar.gz
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tar xfz hadoop-2.8.2.tar.gz
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sudo mv hadoop-2.8.2 /usr/local/hadoop
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rm hadoop-2.8.2.tar.gz
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# Environmental Variables
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echo export JAVA_HOME=/usr/lib/jvm/java-8-oracle >> ~/.bashrc
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echo export HADOOP_PREFIX=/usr/local/hadoop >> ~/.bashrc
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echo export PATH=\$PATH:/usr/local/hadoop/bin >> ~/.bashrc
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echo export PATH=\$PATH:/usr/local/hadoop/sbin >> ~/.bashrc
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source ~/.bashrc
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# Copy configuration files
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cp master/* /usr/local/hadoop/etc/hadoop/
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# Format HDFS
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hdfs namenode -format
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# SSH keys for Hadoop to use.
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ssh-keygen -t rsa -P 'password' -f ~/.ssh/id_rsa.pub
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sudo mv ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
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# SSH
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ssh localhost
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# authenticate with osboxes.org
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# Start NameNode daemon and DataNode daemon
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start-dfs.sh
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# stop-dfs.sh
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# Install Maven
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sudo apt-get install maven
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# Access Hadoop - http://localhost:50070
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@ -0,0 +1,3 @@
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.idea
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*/target/*
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*.iml
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@ -0,0 +1,55 @@
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<?xml version="1.0"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
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xmlns="http://maven.apache.org/POM/4.0.0">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung.twitterhdfs</groupId>
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<artifactId>twitterhdfs</artifactId>
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<packaging>jar</packaging>
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<version>1.0.0</version>
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<name>twitterhdfs</name>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>1.8</java.version>
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</properties>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>1.5.8.RELEASE</version>
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</parent>
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<dependencies>
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<!-- Spring Stream Starter Apps -->
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<dependency>
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<groupId>org.springframework.cloud.stream.app</groupId>
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<artifactId>spring-cloud-starter-stream-source-twitterstream</artifactId>
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<version>1.3.1.RELEASE</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.cloud.stream.app</groupId>
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<artifactId>spring-cloud-starter-stream-sink-hdfs</artifactId>
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<version>1.3.1.RELEASE</version>
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</dependency>
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<!-- JSTL/JSP -->
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>jstl</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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<finalName>twitterhdfs</finalName>
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</build>
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</project>
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@ -0,0 +1,18 @@
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package com.baeldung.twitterhdfs.aggregate;
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import com.baeldung.twitterhdfs.processor.ProcessorApp;
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import com.baeldung.twitterhdfs.source.SourceApp;
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import com.baeldung.twitterhdfs.sink.SinkApp;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.cloud.stream.aggregate.AggregateApplicationBuilder;
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@SpringBootApplication
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public class AggregateApp {
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public static void main(String[] args) {
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new AggregateApplicationBuilder()
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.from(SourceApp.class).args("--fixedDelay=5000")
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.via(ProcessorApp.class)
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.to(SinkApp.class).args("--debug=true")
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.run(args);
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}
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}
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@ -0,0 +1,20 @@
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package com.baeldung.twitterhdfs.processor;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.cloud.stream.annotation.EnableBinding;
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import org.springframework.cloud.stream.messaging.Processor;
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import org.springframework.integration.annotation.Transformer;
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@SpringBootApplication
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@EnableBinding(Processor.class)
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public class ProcessorApp {
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Logger log = LoggerFactory.getLogger(ProcessorApp.class);
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@Transformer(inputChannel = Processor.INPUT, outputChannel = Processor.OUTPUT)
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public String processMessage(String payload) {
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log.info("Payload received!");
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return payload;
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}
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}
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@ -0,0 +1,22 @@
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package com.baeldung.twitterhdfs.sink;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.cloud.stream.annotation.EnableBinding;
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import org.springframework.cloud.stream.app.hdfs.sink.HdfsSinkConfiguration;
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import org.springframework.cloud.stream.messaging.Sink;
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import org.springframework.context.annotation.Import;
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import org.springframework.integration.annotation.ServiceActivator;
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@SpringBootApplication
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@EnableBinding(Sink.class)
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@Import(HdfsSinkConfiguration.class)
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public class SinkApp {
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Logger log = LoggerFactory.getLogger(SinkApp.class);
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@ServiceActivator(inputChannel= Sink.INPUT)
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public void loggerSink(Object payload) {
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log.info("Received: " + payload);
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}
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}
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@ -0,0 +1,26 @@
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package com.baeldung.twitterhdfs.source;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.cloud.stream.annotation.EnableBinding;
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import org.springframework.cloud.stream.app.twitterstream.source.TwitterstreamSourceConfiguration;
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import org.springframework.cloud.stream.messaging.Source;
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import org.springframework.context.annotation.Import;
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import org.springframework.integration.annotation.InboundChannelAdapter;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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@SpringBootApplication
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@EnableBinding(Source.class)
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@Import(TwitterstreamSourceConfiguration.class)
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public class SourceApp {
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Logger log = LoggerFactory.getLogger(SourceApp.class);
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@InboundChannelAdapter(value = Source.OUTPUT)
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public String timerMessageSource() {
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return new SimpleDateFormat().format(new Date());
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}
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}
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@ -0,0 +1,6 @@
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hdfs.fs-uri=hdfs://127.0.0.1:50010/
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twitter.credentials.access-token=
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twitter.credentials.access-token-secret=
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twitter.credentials.consumer-key=
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twitter.credentials.consumer-secret=
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|
|
@ -0,0 +1 @@
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hdfs.fs-uri=hdfs://127.0.0.1:50010/
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|
|
@ -0,0 +1,11 @@
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# Git spring-cloud-stream-app-starters
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# https://github.com/spring-cloud-stream-app-starters/hdfs/blob/master/spring-cloud-starter-stream-sink-hdfs/README.adoc
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git clone https://github.com/spring-cloud-stream-app-starters/hdfs.git
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|
||||
# Build it
|
||||
./mvnw clean install -PgenerateApps
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|
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# Run it
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||||
cd apps
|
||||
# Optionally inject application.properties prior to build
|
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java -jar hdfs-sink.jar --fsUri=hdfs://127.0.0.1:50010/
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|
|
@ -0,0 +1,4 @@
|
|||
twitter.credentials.access-token=
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twitter.credentials.access-token-secret=
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twitter.credentials.consumer-key=
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twitter.credentials.consumer-secret=
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|
|
@ -0,0 +1,12 @@
|
|||
# Git spring-cloud-stream-app-starters
|
||||
# https://github.com/spring-cloud-stream-app-starters/hdfs/blob/master/spring-cloud-starter-stream-sink-hdfs/README.adoc
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git clone https://github.com/spring-cloud-stream-app-starters/twitter.git
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||||
|
||||
# Build it
|
||||
./mvnw clean install -PgenerateApps
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||||
|
||||
# Run it
|
||||
cd apps
|
||||
# Optionally inject application.properties prior to build
|
||||
java -jar twitter_stream_source.jar --consumerKey=<CONSUMER_KEY> --consumerSecret=<CONSUMER_SECRET> \
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--accessToken=<ACCESS_TOKEN> --accessTokenSecret=<ACCESS_TOKEN_SECRET>
|
||||
|
|
@ -2,3 +2,4 @@
|
|||
|
||||
- [HandlerAdapters in Spring MVC](http://www.baeldung.com/spring-mvc-handler-adapters)
|
||||
- [Template Engines for Spring](http://www.baeldung.com/spring-template-engines)
|
||||
- [Spring 5 and Servlet 4 – The PushBuilder](http://www.baeldung.com/spring-5-push)
|
||||
|
|
|
|||
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