TimeWindows (streams 7.8.0-ce API)

java.lang.Object
- org.apache.kafka.streams.kstream.Windows<org.apache.kafka.streams.kstream.internals.TimeWindow>
- - org.apache.kafka.streams.kstream.TimeWindows

```
public final class TimeWindows
extends Windows<org.apache.kafka.streams.kstream.internals.TimeWindow>
```
The fixed-size time-based window specifications used for aggregations.
The semantics of time-based aggregation windows are: Every T1 (advance) milliseconds, compute the aggregate total for T2 (size) milliseconds.
- If advance < size a hopping windows is defined:
  it discretize a stream into overlapping windows, which implies that a record maybe contained in one and or more "adjacent" windows.
- If advance == size a tumbling window is defined:
  it discretize a stream into non-overlapping windows, which implies that a record is only ever contained in one and only one tumbling window.
Thus, the specified TimeWindows are aligned to the epoch. Aligned to the epoch means, that the first window starts at timestamp zero. For example, hopping windows with size of 5000ms and advance of 3000ms, have window boundaries [0;5000),[3000;8000),... and not [1000;6000),[4000;9000),... or even something "random" like [1452;6452),[4452;9452),...
For time semantics, see TimestampExtractor.
See Also:

SessionWindows, UnlimitedWindows, JoinWindows, KGroupedStream.windowedBy(Windows), TimestampExtractor

Field Summary

Fields
Modifier and Type	Field and Description
`long`	`advanceMs` The size of the window's advance interval in milliseconds, i.e., by how much a window moves forward relative to the previous one.
`long`	`sizeMs` The size of the windows in milliseconds.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`TimeWindows`	`advanceBy(Duration advance)` Return a window definition with the original size, but advance ("hop") the window by the given interval, which specifies by how much a window moves forward relative to the previous one.
`boolean`	`equals(Object o)`
`TimeWindows`	`grace(Duration afterWindowEnd)` Deprecated. since 3.0. Use `ofSizeAndGrace(Duration, Duration)` instead
`long`	`gracePeriodMs()` Return the window grace period (the time to admit out-of-order events after the end of the window.) Delay is defined as (stream_time - record_timestamp).
`int`	`hashCode()`
`static TimeWindows`	`of(Duration size)` Deprecated. since 3.0. Use `ofSizeWithNoGrace(Duration)` } instead
`static TimeWindows`	`ofSizeAndGrace(Duration size, Duration afterWindowEnd)` Return a window definition with the given window size, and with the advance interval being equal to the window size.
`static TimeWindows`	`ofSizeWithNoGrace(Duration size)` Return a window definition with the given window size, and with the advance interval being equal to the window size.
`long`	`size()` Return the size of the specified windows in milliseconds.
`String`	`toString()`
`Map<Long,org.apache.kafka.streams.kstream.internals.TimeWindow>`	`windowsFor(long timestamp)` Create all windows that contain the provided timestamp, indexed by non-negative window start timestamps.

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - sizeMs
```
public final long sizeMs
```
    The size of the windows in milliseconds.
  - advanceMs
```
public final long advanceMs
```
    The size of the window's advance interval in milliseconds, i.e., by how much a window moves forward relative to the previous one.
- Method Detail
  - ofSizeWithNoGrace
```
public static TimeWindows ofSizeWithNoGrace(Duration size)
                                     throws IllegalArgumentException
```
    Return a window definition with the given window size, and with the advance interval being equal to the window size. The time interval represented by the N-th window is: [N * size, N * size + size).
    This provides the semantics of tumbling windows, which are fixed-sized, gap-less, non-overlapping windows. Tumbling windows are a special case of hopping windows with advance == size.
    CAUTION: Using this method implicitly sets the grace period to zero, which means that any out-of-order records arriving after the window ends are considered late and will be dropped.
    
    Parameters:
    
    size - The size of the window
    
    Returns:
    
    a new window definition with default no grace period. Note that this means out-of-order records arriving after the window end will be dropped
    
    Throws:
    
    IllegalArgumentException - if the specified window size is zero or negative or can't be represented as long milliseconds
  - ofSizeAndGrace
```
public static TimeWindows ofSizeAndGrace(Duration size,
                                         Duration afterWindowEnd)
                                  throws IllegalArgumentException
```
    Return a window definition with the given window size, and with the advance interval being equal to the window size. The time interval represented by the N-th window is: [N * size, N * size + size).
    This provides the semantics of tumbling windows, which are fixed-sized, gap-less, non-overlapping windows. Tumbling windows are a special case of hopping windows with advance == size.
    Using this method explicitly sets the grace period to the duration specified by afterWindowEnd, which means that only out-of-order records arriving more than the grace period after the window end will be dropped. The window close, after which any incoming records are considered late and will be rejected, is defined as windowEnd + afterWindowEnd
    
    Parameters:
    
    size - The size of the window. Must be larger than zero
    
    afterWindowEnd - The grace period to admit out-of-order events to a window. Must be non-negative.
    
    Returns:
    
    a TimeWindows object with the specified size and the specified grace period
    
    Throws:
    
    IllegalArgumentException - if afterWindowEnd is negative or can't be represented as long milliseconds
  - of
```
@Deprecated
public static TimeWindows of(Duration size)
                                  throws IllegalArgumentException
```
    Deprecated. since 3.0. Use ofSizeWithNoGrace(Duration) } instead
    
    Return a window definition with the given window size, and with the advance interval being equal to the window size. The time interval represented by the N-th window is: [N * size, N * size + size).
    This provides the semantics of tumbling windows, which are fixed-sized, gap-less, non-overlapping windows. Tumbling windows are a special case of hopping windows with advance == size.
    
    Parameters:
    
    size - The size of the window
    
    Returns:
    
    a new window definition without specifying the grace period (default to 24 hours minus window size)
    
    Throws:
    
    IllegalArgumentException - if the specified window size is zero or negative or can't be represented as long milliseconds
  - advanceBy
```
public TimeWindows advanceBy(Duration advance)
```
    Return a window definition with the original size, but advance ("hop") the window by the given interval, which specifies by how much a window moves forward relative to the previous one. The time interval represented by the N-th window is: [N * advance, N * advance + size).
    This provides the semantics of hopping windows, which are fixed-sized, overlapping windows.
    
    Parameters:
    
    advance - The advance interval ("hop") of the window, with the requirement that 0 < advance.toMillis() <= sizeMs.
    
    Returns:
    
    a new window definition with default maintain duration of 1 day
    
    Throws:
    
    IllegalArgumentException - if the advance interval is negative, zero, or larger than the window size
  - windowsFor
```
public Map<Long,org.apache.kafka.streams.kstream.internals.TimeWindow> windowsFor(long timestamp)
```
    Description copied from class: Windows
    
    Create all windows that contain the provided timestamp, indexed by non-negative window start timestamps.
    
    Specified by:
    
    windowsFor in class Windows<org.apache.kafka.streams.kstream.internals.TimeWindow>
    
    Parameters:
    
    timestamp - the timestamp window should get created for
    
    Returns:
    
    a map of windowStartTimestamp -> Window entries
  - size
```
public long size()
```
    Description copied from class: Windows
    
    Return the size of the specified windows in milliseconds.
    
    Specified by:
    
    size in class Windows<org.apache.kafka.streams.kstream.internals.TimeWindow>
    
    Returns:
    
    the size of the specified windows
  - grace
```
@Deprecated
public TimeWindows grace(Duration afterWindowEnd)
                              throws IllegalArgumentException
```
    Deprecated. since 3.0. Use ofSizeAndGrace(Duration, Duration) instead
    
    Reject out-of-order events that arrive more than millisAfterWindowEnd after the end of its window.
    Delay is defined as (stream_time - record_timestamp).
    
    Parameters:
    
    afterWindowEnd - The grace period to admit out-of-order events to a window.
    
    Returns:
    
    this updated builder
    
    Throws:
    
    IllegalArgumentException - if afterWindowEnd is negative or can't be represented as long milliseconds
    
    IllegalStateException - if grace(Duration) is called after ofSizeAndGrace(Duration, Duration) or ofSizeWithNoGrace(Duration)
  - gracePeriodMs
```
public long gracePeriodMs()
```
    Description copied from class: Windows
    
    Return the window grace period (the time to admit out-of-order events after the end of the window.) Delay is defined as (stream_time - record_timestamp).
    
    Specified by:
    
    gracePeriodMs in class Windows<org.apache.kafka.streams.kstream.internals.TimeWindow>
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class TimeWindows

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

sizeMs

advanceMs

Method Detail

ofSizeWithNoGrace

ofSizeAndGrace

of

advanceBy

windowsFor

size

grace

gracePeriodMs

equals

hashCode

toString