WindowOperator.Context (flink-streaming-java 1.10.3 API)

java.lang.Object
- org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.Context

所有已实现的接口:

Trigger.OnMergeContext, Trigger.TriggerContext

封闭类:

WindowOperator<K,IN,ACC,OUT,W extends Window>
```
public class WindowOperator.Context
extends Object
implements Trigger.OnMergeContext
```
Context is a utility for handling Trigger invocations. It can be reused by setting the key and window fields. No internal state must be kept in the Context

字段概要

字段
限定符和类型字段和说明

protected K key

protected Collection<W> mergedWindows

protected W window

字段
限定符和类型	字段和说明
`protected K`	`key`
`protected Collection<W>`	`mergedWindows`
`protected W`	`window`

构造器概要

构造器
构造器和说明

Context(K key, W window)

构造器
构造器和说明
`Context(K key, W window)`

方法概要

所有方法实例方法具体方法
限定符和类型	方法和说明
`void`	`clear()`
`void`	`deleteEventTimeTimer(long time)` Delete the event-time trigger for the given time.
`void`	`deleteProcessingTimeTimer(long time)` Delete the processing time trigger for the given time.
`long`	`getCurrentProcessingTime()` Returns the current processing time.
`long`	`getCurrentWatermark()` Returns the current watermark time.
`<S extends Serializable> org.apache.flink.api.common.state.ValueState<S>`	`getKeyValueState(String name, Class<S> stateType, S defaultState)` Retrieves a `ValueState` object that can be used to interact with fault-tolerant state that is scoped to the window and key of the current trigger invocation.
`<S extends Serializable> org.apache.flink.api.common.state.ValueState<S>`	`getKeyValueState(String name, org.apache.flink.api.common.typeinfo.TypeInformation<S> stateType, S defaultState)` Retrieves a `ValueState` object that can be used to interact with fault-tolerant state that is scoped to the window and key of the current trigger invocation.
`org.apache.flink.metrics.MetricGroup`	`getMetricGroup()` Returns the metric group for this `Trigger`.
`<S extends org.apache.flink.api.common.state.State> S`	`getPartitionedState(org.apache.flink.api.common.state.StateDescriptor<S,?> stateDescriptor)` Retrieves a `State` object that can be used to interact with fault-tolerant state that is scoped to the window and key of the current trigger invocation.
`<S extends org.apache.flink.api.common.state.MergingState<?,?>> void`	`mergePartitionedState(org.apache.flink.api.common.state.StateDescriptor<S,?> stateDescriptor)`
`TriggerResult`	`onElement(StreamRecord<IN> element)`
`TriggerResult`	`onEventTime(long time)`
`void`	`onMerge(Collection<W> mergedWindows)`
`TriggerResult`	`onProcessingTime(long time)`
`void`	`registerEventTimeTimer(long time)` Register an event-time callback.
`void`	`registerProcessingTimeTimer(long time)` Register a system time callback.
`String`	`toString()`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- 字段详细资料
  - key
```
protected K key
```
  - window
```
protected W extends Window window
```
  - mergedWindows
```
protected Collection<W extends Window> mergedWindows
```
- 构造器详细资料
  - Context
```
public Context(K key,
               W window)
```
- 方法详细资料
  - getMetricGroup
```
public org.apache.flink.metrics.MetricGroup getMetricGroup()
```
    从接口复制的说明: Trigger.TriggerContext
    
    Returns the metric group for this Trigger. This is the same metric group that would be returned from RuntimeContext.getMetricGroup() in a user function.
    You must not call methods that create metric objects (such as MetricGroup.counter(int) multiple times but instead call once and store the metric object in a field.
    
    指定者:
    
    getMetricGroup 在接口中 Trigger.TriggerContext
  - getCurrentWatermark
```
public long getCurrentWatermark()
```
    从接口复制的说明: Trigger.TriggerContext
    
    Returns the current watermark time.
    
    指定者:
    
    getCurrentWatermark 在接口中 Trigger.TriggerContext
  - getKeyValueState
```
public <S extends Serializable> org.apache.flink.api.common.state.ValueState<S> getKeyValueState(String name,
                                                                                                 Class<S> stateType,
                                                                                                 S defaultState)
```
    从接口复制的说明: Trigger.TriggerContext
    
    Retrieves a ValueState object that can be used to interact with fault-tolerant state that is scoped to the window and key of the current trigger invocation.
    
    指定者:
    
    getKeyValueState 在接口中 Trigger.TriggerContext
    
    类型参数:
    
    S - The type of the state.
    
    参数:
    
    name - The name of the key/value state.
    
    stateType - The class of the type that is stored in the state. Used to generate serializers for managed memory and checkpointing.
    
    defaultState - The default state value, returned when the state is accessed and no value has yet been set for the key. May be null.
    
    返回:
    
    The partitioned state object.
  - getKeyValueState
```
public <S extends Serializable> org.apache.flink.api.common.state.ValueState<S> getKeyValueState(String name,
                                                                                                 org.apache.flink.api.common.typeinfo.TypeInformation<S> stateType,
                                                                                                 S defaultState)
```
    从接口复制的说明: Trigger.TriggerContext
    
    Retrieves a ValueState object that can be used to interact with fault-tolerant state that is scoped to the window and key of the current trigger invocation.
    
    指定者:
    
    getKeyValueState 在接口中 Trigger.TriggerContext
    
    类型参数:
    
    S - The type of the state.
    
    参数:
    
    name - The name of the key/value state.
    
    stateType - The type information for the type that is stored in the state. Used to create serializers for managed memory and checkpoints.
    
    defaultState - The default state value, returned when the state is accessed and no value has yet been set for the key. May be null.
    
    返回:
    
    The partitioned state object.
  - getPartitionedState
```
public <S extends org.apache.flink.api.common.state.State> S getPartitionedState(org.apache.flink.api.common.state.StateDescriptor<S,?> stateDescriptor)
```
    从接口复制的说明: Trigger.TriggerContext
    
    Retrieves a State object that can be used to interact with fault-tolerant state that is scoped to the window and key of the current trigger invocation.
    
    指定者:
    
    getPartitionedState 在接口中 Trigger.TriggerContext
    
    类型参数:
    
    S - The type of the state.
    
    参数:
    
    stateDescriptor - The StateDescriptor that contains the name and type of the state that is being accessed.
    
    返回:
    
    The partitioned state object.
  - mergePartitionedState
```
public <S extends org.apache.flink.api.common.state.MergingState<?,?>> void mergePartitionedState(org.apache.flink.api.common.state.StateDescriptor<S,?> stateDescriptor)
```
    指定者:
    
    mergePartitionedState 在接口中 Trigger.OnMergeContext
  - getCurrentProcessingTime
```
public long getCurrentProcessingTime()
```
    从接口复制的说明: Trigger.TriggerContext
    
    Returns the current processing time.
    
    指定者:
    
    getCurrentProcessingTime 在接口中 Trigger.TriggerContext
  - registerProcessingTimeTimer
```
public void registerProcessingTimeTimer(long time)
```
    从接口复制的说明: Trigger.TriggerContext
    
    Register a system time callback. When the current system time passes the specified time Trigger.onProcessingTime(long, Window, TriggerContext) is called with the time specified here.
    
    指定者:
    
    registerProcessingTimeTimer 在接口中 Trigger.TriggerContext
    
    参数:
    
    time - The time at which to invoke Trigger.onProcessingTime(long, Window, TriggerContext)
  - registerEventTimeTimer
```
public void registerEventTimeTimer(long time)
```
    从接口复制的说明: Trigger.TriggerContext
    
    Register an event-time callback. When the current watermark passes the specified time Trigger.onEventTime(long, Window, TriggerContext) is called with the time specified here.
    
    指定者:
    
    registerEventTimeTimer 在接口中 Trigger.TriggerContext
    
    参数:
    
    time - The watermark at which to invoke Trigger.onEventTime(long, Window, TriggerContext)
    
    另请参阅:
    
    Watermark
  - deleteProcessingTimeTimer
```
public void deleteProcessingTimeTimer(long time)
```
    从接口复制的说明: Trigger.TriggerContext
    
    Delete the processing time trigger for the given time.
    
    指定者:
    
    deleteProcessingTimeTimer 在接口中 Trigger.TriggerContext
  - deleteEventTimeTimer
```
public void deleteEventTimeTimer(long time)
```
    从接口复制的说明: Trigger.TriggerContext
    
    Delete the event-time trigger for the given time.
    
    指定者:
    
    deleteEventTimeTimer 在接口中 Trigger.TriggerContext
  - onElement
```
public TriggerResult onElement(StreamRecord<IN> element)
                        throws Exception
```
    抛出:
    
    Exception
  - onProcessingTime
```
public TriggerResult onProcessingTime(long time)
                               throws Exception
```
    抛出:
    
    Exception
  - onEventTime
```
public TriggerResult onEventTime(long time)
                          throws Exception
```
    抛出:
    
    Exception
  - onMerge
```
public void onMerge(Collection<W> mergedWindows)
             throws Exception
```
    抛出:
    
    Exception
  - clear
```
public void clear()
           throws Exception
```
    抛出:
    
    Exception
  - toString
```
public String toString()
```
    覆盖:
    
    toString 在类中 Object

类 WindowOperator.Context

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

key

window

mergedWindows

构造器详细资料

Context

方法详细资料

getMetricGroup

getCurrentWatermark

getKeyValueState

getKeyValueState

getPartitionedState

mergePartitionedState

getCurrentProcessingTime

registerProcessingTimeTimer

registerEventTimeTimer

deleteProcessingTimeTimer

deleteEventTimeTimer

onElement

onProcessingTime

onEventTime

onMerge

clear

toString