zyfjrx opened a new pull request, #23023:
URL: https://github.com/apache/flink/pull/23023
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## Contribution Checklist
- Make sure that the pull request corresponds to a [JIRA
issue](https://issues.apache.org/jira/projects/FLINK/issues). Exceptions are
made for typos in JavaDoc or documentation files, which need no JIRA issue.
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this pattern: `[hotfix] [docs] Fix typo in event time introduction` or
`[hotfix] [javadocs] Expand JavaDoc for PuncuatedWatermarkGenerator`.
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## What is the purpose of the change
When using windows for calculations, when the logic is frequently modified
and adjusted, the entire program needs to be stopped, the code is modified, the
program is repackaged and then submitted to the cluster. It is impossible to
achieve logic dynamic modification and external dynamic injection. The window
information can be obtained from the data to trigger Redistribution of windows
to achieve the effect of dynamic windows
## Brief change log
- *First two dynamic time window triggers are defined
`DynamicEventTimeTrigger`、`DynamicProcessingTimeTrigger`*
- *Then defined the time adjustment extractor ``TimeAdjustExtractor``*
- *Finally implemented the window assign `DynamicSlidingEventTimeWindows`
、`DynamicSlidingProcessingTimeWindows`*
## Verifying this change
(example:)
### pojo class
```java
public class TestPojo {
public String word;
public Integer value;
public long timestamp;
public long winSize;
public long winSlide;
public TestPojo() {
}
public TestPojo(String word,Integer value, long timestamp, long winSize,
long winSlide) {
this.word = word;
this.value = value;
this.timestamp = timestamp;
this.winSize = winSize;
this.winSlide = winSlide;
}
public static TestPojo of(String word,Integer value, long timestamp,
long winSize, long winSlide){
return new TestPojo(word,value,timestamp,winSize,winSlide);
}
}
```
### Dynamic Windows Calculate
```java
public static void main(String[] args) throws Exception {
StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
env.setParallelism(1);
env
.socketTextStream("localhost", 9999)
.map(new MapFunction<String, TestPojo>() {
@Override
public TestPojo map(String s) throws Exception {
String[] split = s.split(",");
return TestPojo.of(
split[0],
Integer.valueOf(split[1]),
Long.parseLong(split[2]),
Long.parseLong(split[2]),
Long.parseLong(split[2])
);
}
})
.assignTimestampsAndWatermarks(
WatermarkStrategy.<TestPojo>forMonotonousTimestamps()
.withTimestampAssigner(new
SerializableTimestampAssigner<TestPojo>() {
@Override
public long extractTimestamp(TestPojo
testPojo, long l) {
return testPojo.timestamp;
}
})
)
.keyBy(r -> r.word)
.window(DynamicSlidingEventTimeWindows.of(
// Pass in the default time information, used when
there is no data stream
Time.seconds(5L), Time.seconds(1L),
// Extract time information from data streams
new TimeAdjustExtractor<TestPojo>() {
@Override
public long extract(TestPojo element) {
return element.winSlide;
}
},
new TimeAdjustExtractor<TestPojo>() {
@Override
public long extract(TestPojo element) {
return element.winSlide;
}
}
))
.sum("value")
.print();
env.execute();
}
```
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): ( no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
- The S3 file system connector: ( no )
## Documentation
- Does this pull request introduce a new feature? (yes)
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