程序包 org.apache.pulsar.client.api

接口 TableView<T>

所有超级接口:

AutoCloseable, Closeable

public interface TableView<T>
extends Closeable

方法概要

修饰符和类型	方法	说明
CompletableFuture<Void>	closeAsync()	Close the table view and releases resources allocated.
boolean	containsKey(String key)	Returns true if this TableView contains a mapping for the specified key.
Set<Map.Entry<String,T>>	entrySet()	Returns a Set view of the mappings contained in this map.
void	forEach(BiConsumer<String,T> action)	Performs the given action for each entry in this map until all entries have been processed or the action throws an exception.
void	forEachAndListen(BiConsumer<String,T> action)	Performs the given action for each entry in this map until all entries have been processed or the action throws an exception.
T	get(String key)	Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
boolean	isEmpty()	Returns true if this TableView contains no key-value mappings.
Set<String>	keySet()	Returns a Set view of the keys contained in this TableView.
void	listen(BiConsumer<String,T> action)	Performs the given action for each future entry in this map until all entries have been processed or the action throws an exception.
void	refresh()	Refresh the table view with the latest data in the topic, ensuring that all subsequent reads are based on the refreshed data.
CompletableFuture<Void>	refreshAsync()	Refresh the table view with the latest data in the topic, ensuring that all subsequent reads are based on the refreshed data.
int	size()	Returns the number of key-value mappings in the TableView.
Collection<T>	values()	Returns a Collection view of the values contained in this TableView.

从接口继承的方法 java.io.Closeable

close

方法详细资料

size

int size()

Returns the number of key-value mappings in the TableView.

返回:

the number of key-value mappings in this TableView

isEmpty

boolean isEmpty()

Returns true if this TableView contains no key-value mappings.

返回:

true if this TableView contains no key-value mappings

containsKey

boolean containsKey(String key)

Returns true if this TableView contains a mapping for the specified key.

参数:

key - key whose presence in this map is to be tested

返回:

true if this map contains a mapping for the specified key

get

T get(String key)

Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.

参数:

key - the key whose associated value is to be returned

返回:

the value associated with the key or null if the keys was not found

entrySet

Set<Map.Entry<String,T>> entrySet()

Returns a Set view of the mappings contained in this map.

返回:

a set view of the mappings contained in this map

keySet

Set<String> keySet()

Returns a Set view of the keys contained in this TableView.

返回:

a set view of the keys contained in this map

values

Collection<T> values()

Returns a Collection view of the values contained in this TableView.

返回:

a collection view of the values contained in this TableView

forEach

void forEach(BiConsumer<String,T> action)

Performs the given action for each entry in this map until all entries have been processed or the action throws an exception.

参数:

action - The action to be performed for each entry

listen

void listen(BiConsumer<String,T> action)

Performs the given action for each future entry in this map until all entries have been processed or the action throws an exception.

参数:

action - The action to be performed for each entry

forEachAndListen

void forEachAndListen(BiConsumer<String,T> action)

Performs the given action for each entry in this map until all entries have been processed or the action throws an exception.

参数:

action - The action to be performed for each entry

closeAsync

CompletableFuture<Void> closeAsync()

Close the table view and releases resources allocated.

返回:

a future that can used to track when the table view has been closed.

refreshAsync

CompletableFuture<Void> refreshAsync()

Refresh the table view with the latest data in the topic, ensuring that all subsequent reads are based on the refreshed data. Example usage: table.refreshAsync().thenApply(__ -> table.get(key)); This function retrieves the last written message in the topic and refreshes the table view accordingly. Once the refresh is complete, all subsequent reads will be performed on the refreshed data or a combination of the refreshed data and newly published data. The table view remains synchronized with any newly published data after the refresh. |x:0|->|y:0|->|z:0|->|x:1|->|z:1|->|x:2|->|y:1|->|y:2| If a read occurs after the refresh (at the last published message |y:2|), it ensures that outdated data like x=1 is not obtained. However, it does not guarantee that the values will always be x=2, y=2, z=1, as the table view may receive updates with newly published data. |x:0|->|y:0|->|z:0|->|x:1|->|z:1|->|x:2|->|y:1|->|y:2| -> |y:3| Both y=2 or y=3 are possible. Therefore, different readers may receive different values, but all values will be equal to or newer than the data refreshed from the last call to the refresh method.

refresh

void refresh()
      throws PulsarClientException

Refresh the table view with the latest data in the topic, ensuring that all subsequent reads are based on the refreshed data.

抛出:

PulsarClientException - if there is any error refreshing the table view.