{"id":47010,"date":"2023-07-31T10:22:58","date_gmt":"2024-01-19T12:03:44","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8apache-flink%e5%92%8cjava-8%e5%af%b9%e4%bc%a0%e6%84%9f%e5%99%a8%e6%95%b0%e6%8d%ae%e8%bf%9b%e8%a1%8c%e7%aa%97%e5%8f%a3%e8%81%9a%e5%90%88\/"},"modified":"2024-04-30T16:15:46","modified_gmt":"2024-04-30T08:15:46","slug":"%e4%bd%bf%e7%94%a8apache-flink%e5%92%8cjava-8%e5%af%b9%e4%bc%a0%e6%84%9f%e5%99%a8%e6%95%b0%e6%8d%ae%e8%bf%9b%e8%a1%8c%e7%aa%97%e5%8f%a3%e8%81%9a%e5%90%88","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8apache-flink%e5%92%8cjava-8%e5%af%b9%e4%bc%a0%e6%84%9f%e5%99%a8%e6%95%b0%e6%8d%ae%e8%bf%9b%e8%a1%8c%e7%aa%97%e5%8f%a3%e8%81%9a%e5%90%88\/","title":{"rendered":"\u4f7f\u7528Apache Flink\u548cJava 8\u5bf9\u4f20\u611f\u5668\u6570\u636e\u8fdb\u884c\u7a97\u53e3\u805a\u5408"},"content":{"rendered":"

\u6211\u4f7f\u7528Apache Flink\u548cScala API\u5c1d\u8bd5\u4e86SensorTag\u7684\u4f20\u611f\u5668\u6570\u636e\u7684\u7a97\u53e3\u805a\u5408\u3002\u6211\u5c06\u5c3d\u91cf\u4f7f\u7528Java 8 API\u6765\u91cd\u65b0\u7f16\u5199Scala API\u3002<\/p>\n

Maven\u539f\u578b<\/h2>\n

\u4f7f\u7528Java API\u4e2d\u7684\u793a\u4f8b\u9879\u76ee\u6765\u521b\u5efa\u4e00\u4e2aMaven\u9879\u76ee\uff0c\u4f7f\u7528flink-quickstart-java\u3002Apache Flink\u7684\u7248\u672c\u548c\u4e4b\u524d\u7684Scala\u7248\u672c\u76f8\u540c\uff0c\u4e3a1.3.2\u3002\u8bf7\u6839\u636e\u60a8\u7684\u73af\u5883\u66f4\u6539groupId\u548cpackage\u3002<\/p>\n

$ <\/span>mkdir<\/span> -p<\/span> ~\/java_apps &&<\/span> cd<\/span> ~\/java_apps\r\n$ <\/span>mvn archetype:generate \\<\/span>\r\n    -DarchetypeGroupId<\/span>=<\/span>org.apache.flink \\<\/span>\r\n    -DarchetypeArtifactId<\/span>=<\/span>flink-quickstart-java \\<\/span>\r\n    -DarchetypeVersion<\/span>=<\/span>1.3.2 \\<\/span>\r\n    -DgroupId<\/span>=<\/span>streams-flink-java-examples \\<\/span>\r\n    -DartifactId<\/span>=<\/span>streams-flink-java-examples \\<\/span>\r\n    -Dversion<\/span>=<\/span>0.1 \\<\/span>\r\n    -Dpackage<\/span>=<\/span>com.github.masato.streams.flink \\<\/span>\r\n    -DinteractiveMode<\/span>=<\/span>false<\/span>\r\n<\/code><\/pre>\n
\u5c06maven-compiler-plugin\u63d2\u4ef6\u7684\u8bbe\u7f6e\u66f4\u6539\u4e3aJava 8 (1.8)\u3002\u5e76\u6dfb\u52a0exec-maven-plugin\u63d2\u4ef6\u4ee5\u4f7f\u5f97\u80fd\u591f\u4eceMaven\u4e2d\u6267\u884cFlink\u5e94\u7528\u7a0b\u5e8f\u7684main()\u65b9\u6cd5\u3002<\/p>\n
    <build><\/span>\r\n        <plugins><\/span>\r\n...\r\n              <plugin><\/span>\r\n                <groupId><\/span>org.apache.maven.plugins<\/groupId><\/span>\r\n                <artifactId><\/span>maven-compiler-plugin<\/artifactId><\/span>\r\n                <version><\/span>3.1<\/version><\/span>\r\n                <configuration><\/span>\r\n                  <source><\/span>1.8<\/source><\/span>\r\n                  <target><\/span>1.8<\/target><\/span>\r\n                <\/configuration><\/span>\r\n              <\/plugin><\/span>\r\n\r\n              <plugin><\/span>\r\n                <groupId><\/span>org.codehaus.mojo<\/groupId><\/span>\r\n                <artifactId><\/span>exec-maven-plugin<\/artifactId><\/span>\r\n                <version><\/span>1.5.0<\/version><\/span>\r\n                <executions><\/span>\r\n                  <execution><\/span>\r\n                    <id><\/span>App<\/id><\/span>\r\n                    <goals><\/span>\r\n                      <goal><\/span>exec<\/goal><\/span>\r\n                    <\/goals><\/span>\r\n                  <\/execution><\/span>\r\n                <\/executions><\/span>\r\n                <configuration><\/span>\r\n                  <executable><\/span>java<\/executable><\/span>\r\n                  <classpathScope><\/span>compile<\/classpathScope><\/span>\r\n                  <arguments><\/span>\r\n                    <argument><\/span>-cp<\/argument><\/span>\r\n                    <classpath\/><\/span>\r\n                    <argument><\/span>com.github.masato.streams.flink.WordCount<\/argument><\/span>\r\n                  <\/arguments><\/span>\r\n                <\/configuration><\/span>\r\n              <\/plugin><\/span>\r\n<\/code><\/pre>\n
\u6267\u884c\u6267\u884c\u76ee\u6807\u3002WordCount\u793a\u4f8b\u5c06\u7edf\u8ba1\u6587\u672c\u4e2d\u7684\u5355\u8bcd\u5e76\u8f93\u51fa\u5230\u6807\u51c6\u8f93\u51fa\u3002<\/p>\n
$ <\/span>mvn clean package exec<\/span>:exec@App\r\n...\r\n(<\/span>is,1)<\/span>\r\n(<\/span>a,1)<\/span>\r\n(<\/span>in<\/span>,1)<\/span>\r\n(<\/span>mind,1)<\/span>\r\n(<\/span>or,2)<\/span>\r\n(<\/span>against,1)<\/span>\r\n(<\/span>arms,1)<\/span>\r\n(<\/span>not,1)<\/span>\r\n(<\/span>sea,1)<\/span>\r\n(<\/span>the,3)<\/span>\r\n(<\/span>troubles,1)<\/span>\r\n(<\/span>fortune,1)<\/span>\r\n(<\/span>take,1)<\/span>\r\n(<\/span>to,4)<\/span>\r\n(<\/span>and,1)<\/span>\r\n(<\/span>arrows,1)<\/span>\r\n(<\/span>be,2)<\/span>\r\n(<\/span>nobler,1)<\/span>\r\n(<\/span>of,2)<\/span>\r\n(<\/span>slings,1)<\/span>\r\n(<\/span>suffer,1)<\/span>\r\n(<\/span>outrageous,1)<\/span>\r\n(<\/span>tis,1)<\/span>\r\n(<\/span>whether,1)<\/span>\r\n(<\/span>question,1)<\/span>\r\n(<\/span>that,1)<\/span>\r\n<\/code><\/pre>\n
\u7a97\u53e3\u6c47\u603b (su\u01d2)
\nNote: “\u30a6\u30a3\u30f3\u30c9\u30a6\u96c6\u8a08” means “window aggregation” in Japanese. The Chinese equivalent is “\u7a97\u53e3\u6c47\u603b.”<\/h2>\n
\u5148\u5220\u9664flink-quickstart-java\u539f\u578b\u521b\u5efa\u7684\u6240\u6709Java\u4ee3\u7801\uff0c\u7136\u540e\u7f16\u5199\u65b0\u7684\u4ee3\u7801\u3002<\/p>\n
$ <\/span>rm <\/span>src\/main\/java\/com\/github\/masato\/streams\/flink\/*<\/span>.java\r\n<\/code><\/pre>\n
\u6e90\u4ee3\u7801\u4e5f\u53ef\u4ee5\u5728\u5b58\u50a8\u5e93\u4e2d\u627e\u5230\u3002\u4f7f\u7528Scala\u7f16\u5199\u7684\u4f8b\u5b50\u662f\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d\uff0c\u4f46\u662f\u4e3a\u4e86\u65b9\u4fbf\u7406\u89e3\uff0cJava\u7684\u60c5\u51b5\u4e0b\u6211\u4eec\u5c06\u5176\u5206\u4e3a\u4e86\u591a\u4e2a\u7c7b\u3002<\/p>\n
$ <\/span>tree streams-flink-java-examples\r\nstreams-flink-java-examples\r\n\u251c\u2500\u2500 pom.xml\r\n\u2514\u2500\u2500 src\r\n    \u2514\u2500\u2500 main\r\n        \u251c\u2500\u2500 java\r\n        \u2502   \u2514\u2500\u2500 com\r\n        \u2502       \u2514\u2500\u2500 github\r\n        \u2502           \u2514\u2500\u2500 masato\r\n        \u2502               \u2514\u2500\u2500 streams\r\n        \u2502                   \u2514\u2500\u2500 flink\r\n        \u2502                       \u251c\u2500\u2500 Accumulator.java\r\n        \u2502                       \u251c\u2500\u2500 Aggregate.java\r\n        \u2502                       \u251c\u2500\u2500 App.java\r\n        \u2502                       \u251c\u2500\u2500 Average.java\r\n        \u2502                       \u2514\u2500\u2500 Sensor.java\r\n        \u2514\u2500\u2500 resources\r\n            \u2514\u2500\u2500 log4j.properties\r\n<\/code><\/pre>\n
App.java\u7684\u4e2d\u6587\u7ffb\u8bd1\u53ef\u4ee5\u662f “\u5e94\u7528\u7a0b\u5e8f.java”\u3002<\/h3>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5b9e\u73b0\u4e86\u4e3b\u65b9\u6cd5\u7684\u7a0b\u5e8f\u7684\u5b8c\u6574\u6587\u672c\u3002\u4e0e\u7528Scala\u7f16\u5199\u7684App.scala\u793a\u4f8b\u7c7b\u4f3c\uff0c\u4f46\u5c06AggregateFunction\u548cWindowFunction\u5206\u522b\u5b9a\u4e49\u4e3a\u7c7b\u3002<\/p>\n
package<\/span> com.github.masato.streams.flink<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.Date<\/span>;<\/span>\r\nimport<\/span> java.util.Map<\/span>;<\/span>\r\nimport<\/span> java.util.HashMap<\/span>;<\/span>\r\nimport<\/span> java.util.Properties<\/span>;<\/span>\r\nimport<\/span> java.time.ZoneId<\/span>;<\/span>\r\nimport<\/span> java.time.ZonedDateTime<\/span>;<\/span>\r\nimport<\/span> java.time.format.DateTimeFormatter<\/span>;<\/span>\r\n\r\nimport<\/span> org.apache.flink.streaming.api.TimeCharacteristic<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.api.datastream.DataStream<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.api.functions.source.SourceFunction<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.api.functions.timestamps.BoundedOutOfOrdernessTimestampExtractor<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.api.windowing.time.Time<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.api.windowing.windows.TimeWindow<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer010<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.connectors.kafka.FlinkKafkaProducer010<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.util.serialization.JSONDeserializationSchema<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.util.serialization.SimpleStringSchema<\/span>;<\/span>\r\n\r\nimport<\/span> com.fasterxml.jackson.databind.ObjectMapper<\/span>;<\/span>\r\nimport<\/span> com.fasterxml.jackson.databind.node.ObjectNode<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> App<\/span> {<\/span>\r\n    private<\/span> static<\/span> DateTimeFormatter<\/span> fmt<\/span> =<\/span> DateTimeFormatter<\/span>.<\/span>ISO_OFFSET_DATE_TIME<\/span>;<\/span>\r\n\r\n    private<\/span> static<\/span> final<\/span> String<\/span> bootstrapServers<\/span> =<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"BOOTSTRAP_SERVERS_CONFIG\"<\/span>);<\/span>\r\n    private<\/span> static<\/span> final<\/span> String<\/span> groupId<\/span> =<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"GROUP_ID\"<\/span>);<\/span>\r\n    private<\/span> static<\/span> final<\/span> String<\/span> sourceTopic<\/span> =<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"SOURCE_TOPIC\"<\/span>);<\/span>\r\n\r\n    private<\/span> static<\/span> final<\/span> String<\/span> sinkTopic<\/span> =<\/span> System<\/span>.<\/span>getenv<\/span>(<\/span>\"SINK_TOPIC\"<\/span>);<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n        final<\/span> Properties<\/span> props<\/span> =<\/span> new<\/span> Properties<\/span>();<\/span>\r\n        props<\/span>.<\/span>setProperty<\/span>(<\/span>\"bootstrap.servers\"<\/span>,<\/span> bootstrapServers<\/span>);<\/span>\r\n        props<\/span>.<\/span>setProperty<\/span>(<\/span>\"group.id\"<\/span>,<\/span> groupId<\/span>);<\/span>\r\n\r\n        final<\/span> StreamExecutionEnvironment<\/span> env<\/span> =<\/span>\r\n            StreamExecutionEnvironment<\/span>.<\/span>getExecutionEnvironment<\/span>();<\/span>\r\n        env<\/span>.<\/span>setStreamTimeCharacteristic<\/span>(<\/span>TimeCharacteristic<\/span>.<\/span>EventTime<\/span>);<\/span>\r\n\r\n        final<\/span> DataStream<\/span><<\/span>ObjectNode<\/span>><\/span> events<\/span> =<\/span>\r\n                                env<\/span>.<\/span>addSource<\/span>(<\/span>new<\/span> FlinkKafkaConsumer010<\/span><>(<\/span>\r\n                                  sourceTopic<\/span>,<\/span>\r\n                                  new<\/span> JSONDeserializationSchema<\/span>(),<\/span>\r\n                                  props<\/span>)).<\/span>name<\/span>(<\/span>\"events\"<\/span>);<\/span>\r\n\r\n        final<\/span> SingleOutputStreamOperator<\/span><<\/span>ObjectNode<\/span>><\/span> timestamped<\/span> =<\/span>\r\n            events<\/span>\r\n            .<\/span>assignTimestampsAndWatermarks<\/span>(<\/span>\r\n                new<\/span> BoundedOutOfOrdernessTimestampExtractor<\/span><<\/span>ObjectNode<\/span>>(<\/span>Time<\/span>.<\/span>seconds<\/span>(<\/span>10<\/span>))<\/span> {<\/span>\r\n                    @Override<\/span>\r\n                    public<\/span> long<\/span> extractTimestamp<\/span>(<\/span>ObjectNode<\/span> element<\/span>)<\/span> {<\/span>\r\n                        return<\/span> element<\/span>.<\/span>get<\/span>(<\/span>\"time\"<\/span>).<\/span>asLong<\/span>()<\/span> *<\/span> 1000<\/span>;<\/span>\r\n                    }<\/span>\r\n                });<\/span>\r\n\r\n        timestamped<\/span>\r\n            .<\/span>map<\/span>((<\/span>v<\/span>)<\/span> -><\/span> {<\/span>\r\n                    String<\/span> key<\/span> =<\/span>  v<\/span>.<\/span>get<\/span>(<\/span>\"bid\"<\/span>).<\/span>asText<\/span>();<\/span>\r\n                    double<\/span> ambient<\/span> =<\/span> v<\/span>.<\/span>get<\/span>(<\/span>\"ambient\"<\/span>).<\/span>asDouble<\/span>();<\/span>\r\n                    return<\/span> new<\/span> Sensor<\/span>(<\/span>key<\/span>,<\/span> ambient<\/span>);<\/span>\r\n            })<\/span>\r\n            .<\/span>keyBy<\/span>(<\/span>v<\/span> -><\/span> v<\/span>.<\/span>key<\/span>)<\/span>\r\n            .<\/span>timeWindow<\/span>(<\/span>Time<\/span>.<\/span>seconds<\/span>(<\/span>60<\/span>))<\/span>\r\n            .<\/span>aggregate<\/span>(<\/span>new<\/span> Aggregate<\/span>(),<\/span> new<\/span> Average<\/span>())<\/span>\r\n            .<\/span>map<\/span>((<\/span>v<\/span>)<\/span> -><\/span> {<\/span>\r\n                    ZonedDateTime<\/span> zdt<\/span> =<\/span>\r\n                        new<\/span> Date<\/span>(<\/span>v<\/span>.<\/span>time<\/span>).<\/span>toInstant<\/span>().<\/span>atZone<\/span>(<\/span>ZoneId<\/span>.<\/span>systemDefault<\/span>());<\/span>\r\n                    String<\/span> time<\/span> =<\/span> fmt<\/span>.<\/span>format<\/span>(<\/span>zdt<\/span>);<\/span>\r\n\r\n                    Map<\/span><<\/span>String<\/span>,<\/span> Object<\/span>><\/span> payload<\/span> =<\/span> new<\/span> HashMap<\/span><<\/span>String<\/span>,<\/span> Object<\/span>>();<\/span>\r\n                    payload<\/span>.<\/span>put<\/span>(<\/span>\"time\"<\/span>,<\/span> time<\/span>);<\/span>\r\n                    payload<\/span>.<\/span>put<\/span>(<\/span>\"bid\"<\/span>,<\/span> v<\/span>.<\/span>bid<\/span>);<\/span>\r\n                    payload<\/span>.<\/span>put<\/span>(<\/span>\"ambient\"<\/span>,<\/span> v<\/span>.<\/span>sum<\/span>);<\/span>\r\n\r\n                    String<\/span> retval<\/span> =<\/span> new<\/span> ObjectMapper<\/span>().<\/span>writeValueAsString<\/span>(<\/span>payload<\/span>);<\/span>\r\n                    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>retval<\/span>);<\/span>\r\n                    return<\/span> retval<\/span>;<\/span>\r\n                })<\/span>\r\n            .<\/span>addSink<\/span>(<\/span>new<\/span> FlinkKafkaProducer010<\/span><<\/span>String<\/span>>(<\/span>\r\n                         bootstrapServers<\/span>,<\/span>\r\n                         sinkTopic<\/span>,<\/span>\r\n                         new<\/span> SimpleStringSchema<\/span>())<\/span>\r\n                     ).<\/span>name<\/span>(<\/span>\"kafka\"<\/span>);<\/span>\r\n\r\n        env<\/span>.<\/span>execute<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4f20\u611f\u5668.java<\/h3>\n
\u5728Scala\u4e2d\uff0c\u4f7f\u7528BD\u5730\u5740\u4f5c\u4e3a\u952e\u521b\u5efa\u4e86\u4e00\u4e2aScala\u5143\u7ec4\uff0c\u7528\u4e8e\u8868\u793a\u6d41\u5f0f\u4f20\u611f\u5668\u6570\u636e\u3002<\/p>\n
    timestamped<\/span>\r\n      .<\/span>map<\/span> {<\/span> v<\/span> =><\/span>\r\n        val<\/span> key<\/span> =<\/span>  v<\/span>.<\/span>get<\/span>(<\/span>\"bid\"<\/span>).<\/span>asText<\/span>\r\n        val<\/span> ambient<\/span> =<\/span> v<\/span>.<\/span>get<\/span>(<\/span>\"ambient\"<\/span>).<\/span>asDouble<\/span>\r\n        (<\/span>key<\/span>,<\/span> ambient<\/span>)<\/span>\r\n      }<\/span>\r\n<\/code><\/pre>\n
\u5373\u4f7f\u5728Java 8\u4e2d\uff0c\u4e5f\u53ef\u4ee5\u50cfScala\u4e00\u6837\u4f7f\u7528Tuple2\u3002\u7136\u800c\uff0c\u6839\u636e\u5728\u4f7f\u7528Apache Flink\u548cJava 8\u7684\u6307\u5357\u4e2d\u6240\u8ff0\uff0c\u9700\u8981\u4f7f\u7528Eclipse JDT\u8fdb\u884c\u7f16\u8bd1\u3002\u53e6\u5916\uff0c\u5982\u679c\u4e0d\u4f7f\u7528TupleTypeInfo\u5728returns()\u4e2d\u6307\u5b9a\u5143\u7d20\u7684\u7c7b\u578b\u63d0\u793a\u4e3aJava\u7c7b\uff0c\u5c06\u4f1a\u51fa\u73b0\u9519\u8bef\u3002<\/p>\n
            .<\/span>map<\/span>((<\/span>v<\/span>)<\/span> -><\/span> {<\/span>\r\n                double<\/span> ambient<\/span> =<\/span> v<\/span>.<\/span>get<\/span>(<\/span>\"value\"<\/span>).<\/span>get<\/span>(<\/span>\"ambient\"<\/span>).<\/span>asDouble<\/span>();<\/span>\r\n                String<\/span> key<\/span> =<\/span>  v<\/span>.<\/span>get<\/span>(<\/span>\"sensor\"<\/span>).<\/span>get<\/span>(<\/span>\"bid\"<\/span>).<\/span>asText<\/span>();<\/span>\r\n                return<\/span> new<\/span> Tuple2<\/span><>(<\/span>key<\/span>,<\/span> ambient<\/span>);<\/span>\r\n            })<\/span>\r\n            .<\/span>returns<\/span>(<\/span>new<\/span> TupleTypeInfo<\/span><>(<\/span>TypeInformation<\/span>.<\/span>of<\/span>(<\/span>String<\/span>.<\/span>class<\/span>),<\/span>\r\n                                         TypeInformation<\/span>.<\/span>of<\/span>(<\/span>Double<\/span>.<\/span>class<\/span>)))<\/span>\r\n\r\n<\/code><\/pre>\n
\u56e0\u4e3a\u7a0d\u5fae\u9ebb\u70e6\uff0c\u6240\u4ee5\u4f7f\u7528\u666e\u901a\u7684POJO\u66f4\u5bb9\u6613\u3002<\/p>\n
package<\/span> com.github.masato.streams.flink<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Sensor<\/span> {<\/span>\r\n    public<\/span> String<\/span> key<\/span>;<\/span>\r\n    public<\/span> double<\/span> ambient<\/span>;<\/span>\r\n\r\n    public<\/span> Sensor<\/span>(<\/span>String<\/span> key<\/span>,<\/span> double<\/span> ambient<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>key<\/span> =<\/span> key<\/span>;<\/span>\r\n        this<\/span>.<\/span>ambient<\/span> =<\/span> ambient<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u805a\u5408.java<\/h3>\n
\u5b9e\u73b0AggregateFunction\u63a5\u53e3\u3002\u4e0eScala\u4e0d\u540c\u7684\u662f\uff0cAccumulator\u4e0d\u662fcase\u7c7b\uff0c\u4f46\u5176\u4ed6\u65b9\u9762\u51e0\u4e4e\u76f8\u540c\u3002<\/p>\n
package<\/span> com.github.masato.streams.flink<\/span>;<\/span>\r\n\r\nimport<\/span> org.apache.flink.api.java.tuple.Tuple2<\/span>;<\/span>\r\n\r\nimport<\/span> org.apache.flink.api.common.functions.AggregateFunction<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Aggregate<\/span> implements<\/span> AggregateFunction<\/span><<\/span>Sensor<\/span>,<\/span> Accumulator<\/span>,<\/span> Accumulator<\/span>><\/span> {<\/span>\r\n\r\n    private<\/span> static<\/span> final<\/span> long<\/span> serialVersionUID<\/span> =<\/span> 3355966737412029618L<\/span>;<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> Accumulator<\/span> createAccumulator<\/span>()<\/span> {<\/span>\r\n        return<\/span> new<\/span> Accumulator<\/span>(<\/span>0L<\/span>,<\/span> \"\"<\/span>,<\/span> 0.0<\/span>,<\/span> 0<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> Accumulator<\/span> merge<\/span>(<\/span>Accumulator<\/span> a<\/span>,<\/span> Accumulator<\/span> b<\/span>)<\/span> {<\/span>\r\n        a<\/span>.<\/span>count<\/span> +=<\/span> b<\/span>.<\/span>count<\/span>;<\/span>\r\n        a<\/span>.<\/span>sum<\/span> +=<\/span> b<\/span>.<\/span>sum<\/span>;<\/span>\r\n        return<\/span> a<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> add<\/span>(<\/span>Sensor<\/span> value<\/span>,<\/span> Accumulator<\/span> acc<\/span>)<\/span> {<\/span>\r\n        acc<\/span>.<\/span>sum<\/span> +=<\/span> value<\/span>.<\/span>ambient<\/span>;<\/span>\r\n        acc<\/span>.<\/span>count<\/span>++;<\/span>\r\n    }<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> Accumulator<\/span> getResult<\/span>(<\/span>Accumulator<\/span> acc<\/span>)<\/span> {<\/span>\r\n        return<\/span> acc<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5e73\u5747\u503c.java<\/h3>\n
\u8fd9\u662fWindowFunction\u7684\u5b9e\u73b0\u3002<\/p>\n
package<\/span> com.github.masato.streams.flink<\/span>;<\/span>\r\n\r\nimport<\/span> org.apache.flink.streaming.api.windowing.windows.TimeWindow<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.streaming.api.functions.windowing.WindowFunction<\/span>;<\/span>\r\nimport<\/span> org.apache.flink.util.Collector<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Average<\/span> implements<\/span> WindowFunction<\/span><<\/span>Accumulator<\/span>,<\/span>\r\n                                               Accumulator<\/span>,<\/span> String<\/span>,<\/span> TimeWindow<\/span>><\/span> {<\/span>\r\n\r\n    private<\/span> static<\/span> final<\/span> long<\/span> serialVersionUID<\/span> =<\/span> 5532466889638450746L<\/span>;<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> apply<\/span>(<\/span>String<\/span> key<\/span>,<\/span>\r\n                      TimeWindow<\/span> window<\/span>,<\/span>\r\n                      Iterable<\/span><<\/span>Accumulator<\/span>><\/span> input<\/span>,<\/span>\r\n                      Collector<\/span><<\/span>Accumulator<\/span>><\/span> out<\/span>)<\/span> {<\/span>\r\n\r\n        Accumulator<\/span> in<\/span> =<\/span> input<\/span>.<\/span>iterator<\/span>().<\/span>next<\/span>();<\/span>\r\n        out<\/span>.<\/span>collect<\/span>(<\/span>new<\/span> Accumulator<\/span>(<\/span>window<\/span>.<\/span>getEnd<\/span>(),<\/span> key<\/span>,<\/span> in<\/span>.<\/span>sum<\/span>\/<\/span>in<\/span>.<\/span>count<\/span>,<\/span> in<\/span>.<\/span>count<\/span>));<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5728Scala\u4e2d\uff0c\u6211\u5df2\u7ecf\u76f4\u63a5\u5c06WindowFunction\u7684apply()\u65b9\u6cd5\u5b9e\u73b0\u5199\u5728\u4e86aggregate\u4e2d\u3002<\/p>\n
      .<\/span>aggregate<\/span>(<\/span>new<\/span> Aggregate<\/span>(),<\/span>\r\n        (<\/span> key<\/span>:<\/span> String<\/span>,<\/span>\r\n          window<\/span>:<\/span> TimeWindow<\/span>,<\/span>\r\n          input<\/span>:<\/span> Iterable<\/span>[<\/span>Accumulator<\/span>],<\/span>\r\n          out<\/span>:<\/span> Collector<\/span>[<\/span>Accumulator<\/span>]<\/span> )<\/span> =><\/span> {<\/span>\r\n            var<\/span> in<\/span> =<\/span> input<\/span>.<\/span>iterator<\/span>.<\/span>next<\/span>()<\/span>\r\n            out<\/span>.<\/span>collect<\/span>(<\/span>Accumulator<\/span>(<\/span>window<\/span>.<\/span>getEnd<\/span>,<\/span> key<\/span>,<\/span> in<\/span>.<\/span>sum<\/span>\/<\/span>in<\/span>.<\/span>count<\/span>,<\/span> in<\/span>.<\/span>count<\/span>))<\/span>\r\n          }<\/span>\r\n      )<\/span>\r\n<\/code><\/pre>\n
pom.xml -> \u9879\u76ee\u5bf9\u8c61\u6a21\u578b.xml<\/h3>\n
Stream\u7684Source\u4f7f\u7528Kafka\u3002\u8fde\u63a5\u4fe1\u606f\u8bbe\u7f6e\u5728exec-maven-plugin\u7684\u73af\u5883\u53d8\u91cf\u4e2d\u3002\u8bf7\u53c2\u8003\u6b64\u5904\u51c6\u5907SensorTag\u548cRaspberry Pi 3\uff0c\u4ee5\u53ca\u6784\u5efaKafka\u96c6\u7fa4\u3002<\/p>\n
    <build><\/span>\r\n        <plugins><\/span>\r\n...\r\n              <plugin><\/span>\r\n                <groupId><\/span>org.apache.maven.plugins<\/groupId><\/span>\r\n                <artifactId><\/span>maven-compiler-plugin<\/artifactId><\/span>\r\n                <version><\/span>3.1<\/version><\/span>\r\n                <configuration><\/span>\r\n                  <source><\/span>1.8<\/source><\/span>\r\n                  <target><\/span>1.8<\/target><\/span>\r\n                <\/configuration><\/span>\r\n              <\/plugin><\/span>\r\n\r\n              <plugin><\/span>\r\n                <groupId><\/span>org.codehaus.mojo<\/groupId><\/span>\r\n                <artifactId><\/span>exec-maven-plugin<\/artifactId><\/span>\r\n                <version><\/span>1.5.0<\/version><\/span>\r\n                <executions><\/span>\r\n                  <execution><\/span>\r\n                    <id><\/span>App<\/id><\/span>\r\n                    <goals><\/span>\r\n                      <goal><\/span>exec<\/goal><\/span>\r\n                    <\/goals><\/span>\r\n                  <\/execution><\/span>\r\n                <\/executions><\/span>\r\n                <configuration><\/span>\r\n                  <executable><\/span>java<\/executable><\/span>\r\n                  <classpathScope><\/span>compile<\/classpathScope><\/span>\r\n                  <arguments><\/span>\r\n                    <argument><\/span>-cp<\/argument><\/span>\r\n                    <classpath\/><\/span>\r\n                    <argument><\/span>com.github.masato.streams.flink.App<\/argument><\/span>\r\n                  <\/arguments><\/span>\r\n                  <environmentVariables><\/span>\r\n                    <APPLICATION_ID_CONFIG><\/span>sensortag<\/APPLICATION_ID_CONFIG><\/span>\r\n                    <BOOTSTRAP_SERVERS_CONFIG><\/span>confluent:9092<\/BOOTSTRAP_SERVERS_CONFIG><\/span>\r\n                    <SOURCE_TOPIC><\/span>sensortag<\/SOURCE_TOPIC><\/span>\r\n                    <SINK_TOPIC><\/span>sensortag-sink<\/SINK_TOPIC><\/span>\r\n                    <GROUP_ID><\/span>flinkGroup<\/GROUP_ID><\/span>\r\n                  <\/environmentVariables><\/span>\r\n                <\/configuration><\/span>\r\n              <\/plugin><\/span>\r\n<\/code><\/pre>\n
\u8fdb\u884c<\/h3>\n
\u5728\u5c06Raspberry Pi 3\u7684SensorTag\u6570\u636e\u53d1\u9001\u5230Kafka\u4e4b\u540e\uff0c\u6267\u884cexec-maven-plugin\u63d2\u4ef6\u7684exec\u76ee\u6807\u3002<\/p>\n
$ mvn clean install exec:exec@App\r\n<\/code><\/pre>\n
\u4f7f\u752860\u79d2\u7684\u6eda\u52a8\u7a97\u53e3\u5bf9\u5468\u56f4\u6e29\u5ea6\u8fdb\u884c\u4e86\u5e73\u5747\u503c\u805a\u5408\uff0c\u5e76\u5c06\u7ed3\u679c\u8f93\u51fa\u5230\u6807\u51c6\u8f93\u51fa\u3002<\/p>\n
{<\/span>\"ambient\"<\/span>:28.395833333333332,\"time\"<\/span>:\"2017-08-28T11:57:00+09:00\"<\/span>,\"bid\"<\/span>:\"B0:B4:48:BD:DA:03\"<\/span>}<\/span>\r\n{<\/span>\"ambient\"<\/span>:28.44375,\"time\"<\/span>:\"2017-08-28T11:58:00+09:00\"<\/span>,\"bid\"<\/span>:\"B0:B4:48:BD:DA:03\"<\/span>}<\/span>\r\n{<\/span>\"ambient\"<\/span>:28.46875,\"time\"<\/span>:\"2017-08-28T11:59:00+09:00\"<\/span>,\"bid\"<\/span>:\"B0:B4:48:BD:DA:03\"<\/span>}<\/span>\r\n{<\/span>\"ambient\"<\/span>:28.5,\"time\"<\/span>:\"2017-08-28T12:00:00+09:00\"<\/span>,\"bid\"<\/span>:\"B0:B4:48:BD:DA:03\"<\/span>}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u6211\u4f7f\u7528Apache Flink\u548cScala API\u5c1d\u8bd5\u4e86SensorTag\u7684\u4f20\u611f\u5668\u6570\u636e\u7684\u7a97\u53e3\u805a\u5408\u3002\u6211\u5c06\u5c3d\u91cf\u4f7f\u7528 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-47010","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u4f7f\u7528Apache Flink\u548cJava 8\u5bf9\u4f20\u611f\u5668\u6570\u636e\u8fdb\u884c\u7a97\u53e3\u805a\u5408 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528apache-flink\u548cjava-8\u5bf9\u4f20\u611f\u5668\u6570\u636e\u8fdb\u884c\u7a97\u53e3\u805a\u5408\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4f7f\u7528Apache Flink\u548cJava 8\u5bf9\u4f20\u611f\u5668\u6570\u636e\u8fdb\u884c\u7a97\u53e3\u805a\u5408\" \/>\n<meta property=\"og:description\" content=\"\u6211\u4f7f\u7528Apache Flink\u548cScala API\u5c1d\u8bd5\u4e86SensorTag\u7684\u4f20\u611f\u5668\u6570\u636e\u7684\u7a97\u53e3\u805a\u5408\u3002\u6211\u5c06\u5c3d\u91cf\u4f7f\u7528 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528apache-flink\u548cjava-8\u5bf9\u4f20\u611f\u5668\u6570\u636e\u8fdb\u884c\u7a97\u53e3\u805a\u5408\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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