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‎docs/msa-boot/first-api.md‎

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#基于 Spring Boot 的一个微服务实现
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本章节，我们将基于 Spring Boot 技术来实现我们的第一个微服务天气预报应用——micro-weather。micro-weather 的作用是实现天气预报功能，可以根据不同的城市，查询该城市的实时天气情况。
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##开发环境
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* Gradle 4.0
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* Spring Boot 2.0.0.M2
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##数据来源
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理论上，天气的数据是天气预报的实现基础。本应用与实际的天气数据无关，理论上，可以兼容多种数据来源。但为求简单，我们在网上找了一个免费、可用的天气数据接口。
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* 天气数据来源为中国天气网<http://www.weather.com.cn/>。
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* 城市ID列表。每个城市都有一个唯一的ID作为标识。见<http://cj.weather.com.cn/support/Detail.aspx?id=51837fba1b35fe0f8411b6df> 。
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天气调用，接口示例，我们以“深圳”城市为例，访问：
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* 通过城市名字获得天气数据 ：<http://wthrcdn.etouch.cn/weather_mini?city=深圳>
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* 通过城市id获得天气数据：<http://wthrcdn.etouch.cn/weather_mini?citykey=101280601>
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可用看到如下天气数据返回。
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```json
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{
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"data": {
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"yesterday": {
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"date":"1日星期五",
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"high":"高温 33℃",
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"fx":"无持续风向",
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"low":"低温 26℃",
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"fl":"<![CDATA[<3级]]>",
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"type":"多云"
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},
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"city":"深圳",
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"aqi":"72",
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"forecast": [
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{
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"date":"2日星期六",
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"high":"高温 32℃",
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"fengli":"<![CDATA[<3级]]>",
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"low":"低温 26℃",
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"fengxiang":"无持续风向",
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"type":"阵雨"
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},
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{
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"date":"3日星期天",
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"high":"高温 29℃",
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"fengli":"<![CDATA[5-6级]]>",
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"low":"低温 26℃",
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"fengxiang":"无持续风向",
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"type":"大雨"
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},
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{
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"date":"4日星期一",
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"high":"高温 29℃",
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"fengli":"<![CDATA[3-4级]]>",
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"low":"低温 26℃",
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"fengxiang":"西南风",
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"type":"暴雨"
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},
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{
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"date":"5日星期二",
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"high":"高温 31℃",
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"fengli":"<![CDATA[<3级]]>",
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"low":"低温 27℃",
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"fengxiang":"无持续风向",
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"type":"阵雨"
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},
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{
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"date":"6日星期三",
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"high":"高温 32℃",
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"fengli":"<![CDATA[<3级]]>",
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"low":"低温 27℃",
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"fengxiang":"无持续风向",
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"type":"阵雨"
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}
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],
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"ganmao":"风较大，阴冷潮湿，较易发生感冒，体质较弱的朋友请注意适当防护。",
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"wendu":"29"
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},
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"status":1000,
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"desc":"OK"
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}
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```
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我们通过观察数据，来了解每个返回字段的含义。
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* "city": 城市名称
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* "aqi": 空气指数,
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* "wendu": 实时温度
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* "date": 日期，包含未来5天
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* "high":最高温度
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* "low": 最低温度
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* "fengli": 风力
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* "fengxiang": 风向
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* "type": 天气类型
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以上数据，是我们需要的天气数据的核心数据，但是，同时也要关注下面两个字段：
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* "status": 接口调用的返回状态，返回值“1000”,意味着数据是接口正常
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* "desc": 接口状态的描述，“OK”代表接口正常
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重点关注返回值不是“1000”的情况,说明，这个接口调用异常了。
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##初始化一个 Spring Boot 项目
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初始化一个 Spring Boot 项目 micro-weather-basic，该项目可以直接在我们之前章节课程中的 basic-gradle 项目基础进行修改。同时，为了优化项目的构建速度，我们对Maven中央仓库地址和 Gradle Wrapper 地址做了调整。其中细节暂且不表，读者可以自行参阅源码，或者学习笔者所著的《Spring Boot 教程》（<https://github.com/waylau/spring-boot-tutorial>）。其原理，我也整理到我的博客中了：
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*https://waylau.com/change-gradle-wrapper-distribution-url-to-local-file/
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*https://waylau.com/use-maven-mirrors/
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##创建天气信息实体 WeatherInfo
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创建`com.waylau.spring.cloud.domain`包，用于存储实体。创建天气信息实体 WeatherInfo

‎docs/msa-boot/msa-boot-api.md‎

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#微服务 API 设计原则
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‎samples/basic-gradle/src/main/java/com/waylau/spring/cloud/CloudApplication.java‎renamed to ‎samples/basic-gradle/src/main/java/com/waylau/spring/cloud/Application.java‎

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importorg.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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publicclassCloudApplication {
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publicclassApplication {
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publicstaticvoidmain(String[]args) {
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SpringApplication.run(CloudApplication.class,args);
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SpringApplication.run(Application.class,args);
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}
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}
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@RunWith(SpringRunner.class)
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@SpringBootTest
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publicclassCloudApplicationTests {
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publicclassApplicationTests {
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@Test
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publicvoidcontextLoads() {
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.gradle
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/build/
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!gradle/wrapper/gradle-wrapper.jar
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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nbproject/private/
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build/
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nbbuild/
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dist/
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nbdist/
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.nb-gradle/
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/bin/
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buildscript {
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ext {
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springBootVersion='1.5.6.RELEASE'
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}
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repositories {
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//mavenCentral()
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maven { url"http://maven.aliyun.com/nexus/content/groups/public/" }
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}
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dependencies {
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classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
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}
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}
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applyplugin:'java'
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applyplugin:'eclipse'
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applyplugin:'org.springframework.boot'
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version='0.0.1-SNAPSHOT'
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sourceCompatibility=1.8
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repositories {
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//mavenCentral()
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maven { url"http://maven.aliyun.com/nexus/content/groups/public/" }
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}
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dependencies {
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compile('org.springframework.boot:spring-boot-starter-web')
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testCompile('org.springframework.boot:spring-boot-starter-test')
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}
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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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zipStoreBase=GRADLE_USER_HOME
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zipStorePath=wrapper/dists
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#distributionUrl=https\://services.gradle.org/distributions/gradle-3.5.1-bin.zip
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distributionUrl=file\:/D:/software/webdev/java/gradle-4.0-all.zip
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#!/usr/bin/env sh
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##############################################################################
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##
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## Gradle start up script for UN*X
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##
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##############################################################################
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# Attempt to set APP_HOME
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# Resolve links: $0 may be a link
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PRG="$0"
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# Need this for relative symlinks.
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while [-h"$PRG" ];do
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ls=`ls -ld"$PRG"`
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link=`expr"$ls":'.*-> \(.*\)$'`
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if expr"$link":'/.*'> /dev/null;then
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PRG="$link"
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else
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PRG=`dirname"$PRG"`"/$link"
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fi
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done
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SAVED="`pwd`"
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cd"`dirname\"$PRG\"`/">/dev/null
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APP_HOME="`pwd -P`"
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cd"$SAVED">/dev/null
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APP_NAME="Gradle"
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APP_BASE_NAME=`basename"$0"`
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# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
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DEFAULT_JVM_OPTS=""
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# Use the maximum available, or set MAX_FD != -1 to use that value.
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MAX_FD="maximum"
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warn ( ) {
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echo"$*"
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}
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die ( ) {
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echo
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echo"$*"
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echo
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exit 1
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}
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# OS specific support (must be 'true' or 'false').
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cygwin=false
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msys=false
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darwin=false
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nonstop=false
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case"`uname`"in
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CYGWIN* )
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cygwin=true
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;;
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Darwin* )
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darwin=true
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;;
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MINGW* )
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msys=true
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;;
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NONSTOP* )
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nonstop=true
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;;
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esac
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CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
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# Determine the Java command to use to start the JVM.
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if [-n"$JAVA_HOME" ];then
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if [-x"$JAVA_HOME/jre/sh/java" ];then
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# IBM's JDK on AIX uses strange locations for the executables
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JAVACMD="$JAVA_HOME/jre/sh/java"
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else
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JAVACMD="$JAVA_HOME/bin/java"
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fi
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if [!-x"$JAVACMD" ];then
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die"ERROR: JAVA_HOME is set to an invalid directory:$JAVA_HOME
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Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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fi
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else
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JAVACMD="java"
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which java>/dev/null2>&1|| die"ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
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Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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fi
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# Increase the maximum file descriptors if we can.
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if ["$cygwin"="false"-a"$darwin"="false"-a"$nonstop"="false" ];then
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MAX_FD_LIMIT=`ulimit -H -n`
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if [$?-eq 0 ];then
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if ["$MAX_FD"="maximum"-o"$MAX_FD"="max" ];then
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MAX_FD="$MAX_FD_LIMIT"
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fi
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ulimit -n$MAX_FD
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if [$?-ne 0 ];then
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warn"Could not set maximum file descriptor limit:$MAX_FD"
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fi
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else
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warn"Could not query maximum file descriptor limit:$MAX_FD_LIMIT"
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fi
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fi
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# For Darwin, add options to specify how the application appears in the dock
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if$darwin;then
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GRADLE_OPTS="$GRADLE_OPTS\"-Xdock:name=$APP_NAME\"\"-Xdock:icon=$APP_HOME/media/gradle.icns\""
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fi
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# For Cygwin, switch paths to Windows format before running java
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if$cygwin;then
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APP_HOME=`cygpath --path --mixed"$APP_HOME"`
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CLASSPATH=`cygpath --path --mixed"$CLASSPATH"`
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JAVACMD=`cygpath --unix"$JAVACMD"`
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# We build the pattern for arguments to be converted via cygpath
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ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d2>/dev/null`
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SEP=""
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fordirin$ROOTDIRSRAW;do
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ROOTDIRS="$ROOTDIRS$SEP$dir"
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SEP="|"
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done
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OURCYGPATTERN="(^($ROOTDIRS))"
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# Add a user-defined pattern to the cygpath arguments
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if ["$GRADLE_CYGPATTERN"!="" ];then
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OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
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fi
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# Now convert the arguments - kludge to limit ourselves to /bin/sh
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i=0
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forargin"$@";do
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CHECK=`echo"$arg"|egrep -c"$OURCYGPATTERN" -`
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CHECK2=`echo"$arg"|egrep -c"^-"`### Determine if an option
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if [$CHECK-ne 0 ]&& [$CHECK2-eq 0 ];then### Added a condition
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eval`echo args$i`=`cygpath --path --ignore --mixed"$arg"`
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else
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eval`echo args$i`="\"$arg\""
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fi
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i=$((i+1))
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done
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case$iin
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(0)set -- ;;
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(1)set --"$args0" ;;
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(2)set --"$args0""$args1" ;;
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(3)set --"$args0""$args1""$args2" ;;
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(4)set --"$args0""$args1""$args2""$args3" ;;
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(5)set --"$args0""$args1""$args2""$args3""$args4" ;;
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(6)set --"$args0""$args1""$args2""$args3""$args4""$args5" ;;
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(7)set --"$args0""$args1""$args2""$args3""$args4""$args5""$args6" ;;
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(8)set --"$args0""$args1""$args2""$args3""$args4""$args5""$args6""$args7" ;;
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(9)set --"$args0""$args1""$args2""$args3""$args4""$args5""$args6""$args7""$args8" ;;
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esac
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fi
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# Escape application args
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save ( ) {
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for idoprintf %s\\n"$i"| sed"s/'/'\\\\''/g;1s/^/'/;\$s/\$/'\\\\/";done
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echo""
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}
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APP_ARGS=$(save"$@")
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# Collect all arguments for the java command, following the shell quoting and substitution rules
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evalset --$DEFAULT_JVM_OPTS$JAVA_OPTS$GRADLE_OPTS"\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath"\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain"$APP_ARGS"
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# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
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if ["$(uname)"="Darwin" ]&& ["$HOME"="$PWD" ];then
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cd"$(dirname"$0")"
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fi
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exec"$JAVACMD""$@"

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