Java_函数式编程

code/Java/stream-tutorial/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>
+
+	<groupId>org.example</groupId>
+	<artifactId>stream-tutorial</artifactId>
+	<version>1.0-SNAPSHOT</version>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<configuration>
+					<source>8</source>
+					<target>8</target>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+
+	<dependencies>
+		<!-- https://mvnrepository.com/artifact/org.redisson/redisson -->
+		<dependency>
+			<groupId>org.redisson</groupId>
+			<artifactId>redisson</artifactId>
+			<version>3.12.5</version>
+		</dependency>
+		<!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
+		<dependency>
+			<groupId>redis.clients</groupId>
+			<artifactId>jedis</artifactId>
+			<version>3.2.0</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.curator</groupId>
+			<artifactId>curator-framework</artifactId>
+			<version>4.3.0</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.curator</groupId>
+			<artifactId>curator-recipes</artifactId>
+			<version>4.3.0</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.zookeeper</groupId>
+			<artifactId>zookeeper</artifactId>
+			<version>3.4.14</version>
+		</dependency>
+	</dependencies>
+
+</project>

code/Java/stream-tutorial/src/main/java/com/heibaiying/DistributedLock.java

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+package com.heibaiying;
+
+import org.apache.curator.RetryPolicy;
+import org.apache.curator.framework.CuratorFramework;
+import org.apache.curator.framework.CuratorFrameworkFactory;
+import org.apache.curator.framework.recipes.locks.InterProcessMutex;
+import org.apache.curator.retry.RetryNTimes;
+
+import java.util.concurrent.TimeUnit;
+
+public class DistributedLock {
+
+
+	public static void main(String[] args) throws Exception {
+
+
+		RetryPolicy retryPolicy = new RetryNTimes(3, 5000);
+		CuratorFramework client = CuratorFrameworkFactory.builder()
+			.connectString("192.168.0.105:2181")
+			.sessionTimeoutMs(10000).retryPolicy(retryPolicy)
+			.namespace("mySpace").build();
+		client.start();
+
+		// 1. 创建分布式锁
+		InterProcessMutex lock = new InterProcessMutex(client, "/distributed/myLock");
+
+		// 2.尝试获取分布式锁
+		if (lock.acquire(10, TimeUnit.SECONDS)) {
+			try {
+				System.out.println("模拟业务耗时");
+				Thread.sleep(3 * 1000);
+			} finally {
+				// 3.释放锁
+				lock.release();
+			}
+		}
+
+		client.close();
+	}
+
+}

code/Java/stream-tutorial/src/main/java/com/heibaiying/Employee.java

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+package com.heibaiying;
+
+public class Employee {
+	private String name;
+	private String gender;
+	private String company;
+	private int age;
+	private boolean isOfficial;
+
+	public Employee(String name, String gender, String company, int age) {
+		this.name = name;
+		this.gender = gender;
+		this.company = company;
+		this.age = age;
+	}
+
+	Employee(String name, int age,boolean isOfficial) {
+		this.name = name;
+		this.age = age;
+		this.isOfficial = isOfficial;
+	}
+
+	@Override
+	public String toString() {
+		return "Employee{" +
+			"name='" + name + '\'' +
+			'}';
+	}
+
+	public boolean isOfficial() {
+		return isOfficial;
+	}
+
+	public void setOfficial(boolean official) {
+		isOfficial = official;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public String getGender() {
+		return gender;
+	}
+
+	public void setGender(String gender) {
+		this.gender = gender;
+	}
+
+	public String getCompany() {
+		return company;
+	}
+
+	public void setCompany(String company) {
+		this.company = company;
+	}
+
+	public int getAge() {
+		return age;
+	}
+
+	public void setAge(int age) {
+		this.age = age;
+	}
+
+}

code/Java/stream-tutorial/src/main/java/com/heibaiying/StreamTest.java

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+package com.heibaiying;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.UUID;
+import java.util.function.BinaryOperator;
+import java.util.function.IntConsumer;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class StreamTest {
+	public static void main(String[] args) {
+		System.out.println(UUID.randomUUID() + ":" + Thread.currentThread().getId());
+
+	}
+
+	/**
+	 * 进行求和
+	 *
+	 * @param list
+	 * @param initValue
+	 * @param binaryOperator
+	 * @param <T>
+	 * @return
+	 */
+	public static <T> T reduce(List<T> list, T initValue, BinaryOperator<T> binaryOperator) {
+		for (T t : list) {
+			initValue = binaryOperator.apply(initValue, t);
+		}
+		return initValue;
+	}
+
+	/**
+	 * 集合过滤
+	 *
+	 * @param list      待过滤的集合
+	 * @param predicate 函数式接口
+	 * @param <T>       集合中元素的类型
+	 * @return 满足条件的元素的集合
+	 */
+	public static <T> List<T> filter(List<T> list, CustomPredicate<T> predicate) {
+		ArrayList<T> result = new ArrayList<>();
+		for (T t : list) {
+			if (predicate.test(t)) result.add(t);
+		}
+		return result;
+	}
+
+
+	/**
+	 * 定义接口
+	 *
+	 * @param <T> 参数类型
+	 */
+	@FunctionalInterface
+	public interface CustomPredicate<T> {
+		// 判断是否满足过滤标准
+		boolean test(T t);
+	}
+
+}

code/Java/stream-tutorial/src/main/resources/log4j.properties

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+log4j.rootLogger=INFO, SYSLOG
+
+log4j.appender.SYSLOG=org.apache.log4j.net.SyslogAppender
+log4j.appender.SYSLOG.syslogHost=127.0.0.1
+log4j.appender.SYSLOG.layout=org.apache.log4j.PatternLayout
+log4j.appender.SYSLOG.layout.conversionPattern=%d{ISO8601} %-5p [%t] %c{2} %x - %m%n
+log4j.appender.SYSLOG.Facility=LOCAL1