To shade or not to shade

2017-07-06 1148

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简介： 你的项目需要使用Joda2.1,但是Elasticsearch 2.0.0-beta2 要求使用Joda2.8 2.0.0-beta2 org.

你的项目需要使用Joda2.1,但是Elasticsearch 2.0.0-beta2 要求使用Joda2.8

<properties>
    <elasticsearch.version>2.0.0-beta2</elasticsearch.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.elasticsearch</groupId>
        <artifactId>elasticsearch</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>
    <dependency>
        <groupId>org.elasticsearch.plugin</groupId>
        <artifactId>shield</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>
    <dependency>
        <groupId>joda-time</groupId>
        <artifactId>joda-time</artifactId>
        <version>2.1</version>
    </dependency>
</dependencies>
<properties>
    <elasticsearch.version>2.0.0-beta2</elasticsearch.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.elasticsearch</groupId>
        <artifactId>elasticsearch</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>
    <dependency>
        <groupId>org.elasticsearch.plugin</groupId>
        <artifactId>shield</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>
    <dependency>
        <groupId>joda-time</groupId>
        <artifactId>joda-time</artifactId>
        <version>2.1</version>
    </dependency>
</dependencies>

遮罩ES

新建一个maven工程，pom.xml如下：

<groupId>my.elasticsearch.test</groupId>
<artifactId>es-shaded</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
    <elasticsearch.version>2.0.0-beta2</elasticsearch.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.elasticsearch</groupId>
        <artifactId>elasticsearch</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>
    <dependency>
        <groupId>org.elasticsearch.plugin</groupId>
        <artifactId>shield</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>
</dependencies>
<repositories>
    <repository>
        <id>elasticsearch-releases</id>
        http://maven.elasticsearch.org/releases
        <releases>
            <enabled>true</enabled>
            <updatePolicy>daily</updatePolicy>
        </releases>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
</repositories>
<groupId>my.elasticsearch.test</groupId>
<artifactId>es-shaded</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
    <elasticsearch.version>2.0.0-beta2</elasticsearch.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.elasticsearch</groupId>
        <artifactId>elasticsearch</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>
    <dependency>
        <groupId>org.elasticsearch.plugin</groupId>
        <artifactId>shield</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>
</dependencies>
<repositories>
    <repository>
        <id>elasticsearch-releases</id>
        http://maven.elasticsearch.org/releases
        <releases>
            <enabled>true</enabled>
            <updatePolicy>daily</updatePolicy>
        </releases>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
</repositories>

遮罩并且重定位冲突的包

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.4.1</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <relocations>
                            <relocation>
                                <pattern>org.joda</pattern>
                                <shadedPattern>my.elasticsearch.joda</shadedPattern>
                            </relocation>
                        </relocations>
                        <transformers>
                            <transformer
                                implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer" />
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.4.1</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <relocations>
                            <relocation>
                                <pattern>org.joda</pattern>
                                <shadedPattern>my.elasticsearch.joda</shadedPattern>
                            </relocation>
                        </relocations>
                        <transformers>
                            <transformer
                                implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer" />
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

运行 mvn clean install 将会创建遮罩后的Elasticsearch版本。Joda2.8也被遮罩起来了

现在你可以同时使用Elasticsearch 2.0.0-beta2和Joda2.1了

<!-- This artifact contains all elasticsearch libs including the shaded version of Joda and Shield -->
<dependency>
    <groupId>my.elasticsearch.test</groupId>
    <artifactId>es-shaded</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency> <!-- You still use your own Joda version -->
<dependency>
    <groupId>joda-time</groupId>
    <artifactId>joda-time</artifactId>
    <version>2.1</version>
</dependency>

使用你自己的版本的Joda,只需要import org.joda.time.DateTime
使用遮罩后版本的Joda,importing my.elasticsearch.joda.time.DateTime，不过一般不建议这样做
因为debug的时候跟源码对不上？

// import org.joda.time.DateTime;
// import my.elasticsearch.joda.time.DateTime;
CodeSource codeSource = new org.joda.time.DateTime().getClass().getProtectionDomain().getCodeSource();
System.out.println("unshaded = " + codeSource);
codeSource = new my.elasticsearch.joda.time.DateTime().getClass().getProtectionDomain().getCodeSource();
System.out.println("shaded = " + codeSource);