Flink 基本转换算子传参方式的总结

Transformation

数据源读入数据之后，我们就可以使用各种转换算子，将一个或多个DataStream转换为新的DataStream，如上图所示。一个Flink程序的核心，其实就是所有的转换操作，它们决定了处理的业务逻辑。我们可以针对一条流进行转换处理，也可以进行分流、合流等多流转换操作，从而组合成复杂的数据流拓扑。但是我们在使用诸如 map,flatMap,filter 时都需要传入一个参数，今天我们就对基本算子的参数得出形式做一下总结。

function

算子的参数其实是调用函数时的执行逻辑，但是这个执行逻辑的表现形式有所不同，下面我们就拿 map 算子作为例子来看下参数传递的几个形式

需求：传入一个POJO 有三个属性（用户名，url，timestamp）,这里需要通过map 算子进行转换，将用户名进行返回。

数据准备

首先获取 flink上下文执行环境，并读取要转换的数据

  StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);
        //从元素中读取数据
        DataStreamSource<Event> elementStream =
                //直接构建对象进行读取数据
                env.fromElements(new Event("令狐冲", "./cart", 1000L),
                        new Event("任盈盈", "./pro?id101", 3000L),
                        new Event("依琳", "./home", 2000L));

方式一、实现 MapFunction

这里构建一个类实现 MapFunction 形式来处理

    public static class MyMapper implements MapFunction<Event, String> {

        @Override
        public String map(Event value) throws Exception {
            return value.user;
        }
    }

调用静态类实现需求‘

        //提取用户 使用自定义类 实现 MapFunction
        SingleOutputStreamOperator<String> map1 = elementStream.map(new MyMapper());

结果

E:\Tools\work_tools\jdk1.8\bin\java.exe "-javaagent:D:\tool\IntelliJ IDEA 2020.1\lib\idea_rt.jar=50865:D:\tool\IntelliJ IDEA 2020.1\bin" -Dfile.encoding=UTF-8 -classpath 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work_tools\apache-maven-3.3.9\repository\org\apache\bahir\flink-connector-redis_2.11\1.0\flink-connector-redis_2.11-1.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\flink\flink-streaming-java_2.11\1.2.0\flink-streaming-java_2.11-1.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\flink\flink-runtime_2.11\1.2.0\flink-runtime_2.11-1.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\flink\flink-shaded-hadoop2\1.2.0\flink-shaded-hadoop2-1.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\tukaani\xz\1.0\xz-1.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\commons-el\commons-el\1.0\commons-el-1.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\jamesmurty\utils\java-xmlbuilder\0.4\java-xmlbuilder-0.4.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\jcraft\jsch\0.1.42\jsch-0.1.42.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\commons-beanutils\commons-beanutils-bean-collections\1.8.3\commons-beanutils-bean-collections-1.8.3.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\commons-daemon\commons-daemon\1.0.13\commons-daemon-1.0.13.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\data-artisans\flakka-actor_2.11\2.3-custom\flakka-actor_2.11-2.3-custom.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\data-artisans\flakka-remote_2.11\2.3-custom\flakka-remote_2.11-2.3-custom.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\uncommons\maths\uncommons-maths\1.2.2a\uncommons-maths-1.2.2a.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\data-artisans\flakka-slf4j_2.11\2.3-custom\flakka-slf4j_2.11-2.3-custom.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\clapper\grizzled-slf4j_2.11\1.0.2\grizzled-slf4j_2.11-1.0.2.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\github\scopt\scopt_2.11\3.2.0\scopt_2.11-3.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\fasterxml\jackson\core\jackson-core\2.7.4\jackson-core-2.7.4.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\fasterxml\jackson\core\jackson-databind\2.7.4\jackson-databind-2.7.4.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\fasterxml\jackson\core\jackson-annotations\2.7.0\jackson-annotations-2.7.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\twitter\chill_2.11\0.7.4\chill_2.11-0.7.4.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\flink\flink-clients_2.11\1.2.0\flink-clients_2.11-1.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\flink\flink-optimizer_2.11\1.2.0\flink-optimizer_2.11-1.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\sling\org.apache.sling.commons.json\2.0.6\org.apache.sling.commons.json-2.0.6.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\redis\clients\jedis\2.8.0\jedis-2.8.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\commons\commons-pool2\2.3\commons-pool2-2.3.jar org.wdh01.chapter05.TransformMapTest
实现MapFunction 接口> 令狐冲
实现MapFunction 接口> 任盈盈
实现MapFunction 接口> 依琳

方式二、直接使用匿名内部类实现 MapFunction 形式

这种方式和上一个形式一样吗，只是省去了单独定义一个类，.

        //提取用户 使用匿名类实现 MapFunction
        SingleOutputStreamOperator<String> map2 = elementStream.map(new MapFunction<Event, String>() {
            @Override
            public String map(Event value) throws Exception {
                return value.user;
            }
        });
 map2.print("MapFunction 内部类");

结果

E:\Tools\work_tools\jdk1.8\bin\java.exe "-javaagent:D:\tool\IntelliJ IDEA 2020.1\lib\idea_rt.jar=50988:D:\tool\IntelliJ IDEA 2020.1\bin" -Dfile.encoding=UTF-8 -classpath 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work_tools\apache-maven-3.3.9\repository\org\apache\bahir\flink-connector-redis_2.11\1.0\flink-connector-redis_2.11-1.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\flink\flink-streaming-java_2.11\1.2.0\flink-streaming-java_2.11-1.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\flink\flink-runtime_2.11\1.2.0\flink-runtime_2.11-1.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\flink\flink-shaded-hadoop2\1.2.0\flink-shaded-hadoop2-1.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\tukaani\xz\1.0\xz-1.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\commons-el\commons-el\1.0\commons-el-1.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\jamesmurty\utils\java-xmlbuilder\0.4\java-xmlbuilder-0.4.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\jcraft\jsch\0.1.42\jsch-0.1.42.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\commons-beanutils\commons-beanutils-bean-collections\1.8.3\commons-beanutils-bean-collections-1.8.3.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\commons-daemon\commons-daemon\1.0.13\commons-daemon-1.0.13.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\data-artisans\flakka-actor_2.11\2.3-custom\flakka-actor_2.11-2.3-custom.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\data-artisans\flakka-remote_2.11\2.3-custom\flakka-remote_2.11-2.3-custom.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\uncommons\maths\uncommons-maths\1.2.2a\uncommons-maths-1.2.2a.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\data-artisans\flakka-slf4j_2.11\2.3-custom\flakka-slf4j_2.11-2.3-custom.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\clapper\grizzled-slf4j_2.11\1.0.2\grizzled-slf4j_2.11-1.0.2.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\github\scopt\scopt_2.11\3.2.0\scopt_2.11-3.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\fasterxml\jackson\core\jackson-core\2.7.4\jackson-core-2.7.4.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\fasterxml\jackson\core\jackson-databind\2.7.4\jackson-databind-2.7.4.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\fasterxml\jackson\core\jackson-annotations\2.7.0\jackson-annotations-2.7.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\com\twitter\chill_2.11\0.7.4\chill_2.11-0.7.4.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\flink\flink-clients_2.11\1.2.0\flink-clients_2.11-1.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\flink\flink-optimizer_2.11\1.2.0\flink-optimizer_2.11-1.2.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\sling\org.apache.sling.commons.json\2.0.6\org.apache.sling.commons.json-2.0.6.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\redis\clients\jedis\2.8.0\jedis-2.8.0.jar;E:\Tools\work_tools\apache-maven-3.3.9\repository\org\apache\commons\commons-pool2\2.3\commons-pool2-2.3.jar org.wdh01.chapter05.TransformMapTest
MapFunction 内部类> 令狐冲
MapFunction 内部类> 任盈盈
MapFunction 内部类> 依琳

方式三、继承 RichMapFunction （富函数）

大多数转换算子都有富函数的版本，富函数相比基本函数除了能够满足对数据的正常转换之外，还可以获取执行转换算子时的一些上下文信息。

    public static class MyRichMapper extends RichMapFunction<Event, String> {

        @Override
        public String map(Event value) throws Exception {
            return value.user;
        }

        @Override
        public void open(Configuration parameters) throws Exception {
            super.open(parameters);
            System.out.println("---open---" + getRuntimeContext().getIndexOfThisSubtask() + " ");
        }

        @Override
        public void close() throws Exception {
            super.close();
            System.out.println("---close---" + getRuntimeContext().getIndexOfThisSubtask() + " ");
        }
    }

调用富函数形式的map实现需求

     //提取用户 继承 RichMapFunction
        SingleOutputStreamOperator<String> map4 = elementStream.map(new MyRichMapper());
   map4.print("继承RichMapFunction");

E:\Tools\work_tools\jdk1.8\bin\java.exe "-javaagent:D:\tool\IntelliJ IDEA 2020.1\lib\idea_rt.jar=51163:D:\tool\IntelliJ IDEA 2020.1\bin" -Dfile.encoding=UTF-8 -classpath 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org.wdh01.chapter05.TransformMapTest
---open---0 
继承RichMapFunction> 令狐冲
继承RichMapFunction> 任盈盈
继承RichMapFunction> 依琳
---close---0

说明：

RicMapFunctionh 版本是抽象类，需要继承（extend)，MapFunction 是接口需要实现（implements）。
RicMapFunctionh 除了满足正常的转换，还能获取执行环境的更多的细节信息。

方式四、lambda 表达式实现转换逻辑

 SingleOutputStreamOperator<String> map3 = elementStream.map(data -> data.user);
 map3.print("lambda 表达式");

结果

E:\Tools\work_tools\jdk1.8\bin\java.exe "-javaagent:D:\tool\IntelliJ IDEA 2020.1\lib\idea_rt.jar=51317:D:\tool\IntelliJ IDEA 2020.1\bin" -Dfile.encoding=UTF-8 -classpath 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org.wdh01.chapter05.TransformMapTest
lambda 表达式> 令狐冲
lambda 表达式> 任盈盈
lambda 表达式> 依琳

相比之前的三种形式 lambda 表达式更加的简要，但是需注意jdk1.8 之后才能使用lambda，使用之前 lambda 注意jdk版本。

posted @ 2022-03-22 10:48 晓枫的春天阅读(521) 评论(0) 编辑收藏举报

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滴水穿石不是靠力，而是因为不舍昼夜。