Package com.clickhouse.client

Class ClickHouseDeferredValue<T>

java.lang.Object

com.clickhouse.client.ClickHouseDeferredValue<T>

All Implemented Interfaces:

Supplier<T>

public final class ClickHouseDeferredValue<T>
extends Object
implements Supplier<T>

This class represents a deferred value. It holds a reference to a Supplier or Future to retrieve value only when get() or getOptional() was called.

Method Summary

Modifier and Type	Method	Description
T	get()
Optional<T>	getOptional()	Gets optional value, which may or may not be null.
static <T> ClickHouseDeferredValue<T>	of(CompletableFuture<T> future)	Wraps a future object.
static <T> ClickHouseDeferredValue<T>	of(CompletableFuture<T> future, int timeout)	Wraps a future object.
static <T> ClickHouseDeferredValue<T>	of(Supplier<T> supplier)	Wraps return value from a supplier function.
static <T> ClickHouseDeferredValue<T>	of(T value, Class<T> clazz)	Wraps given value as a deferred value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

of

public static <T> ClickHouseDeferredValue<T> of(CompletableFuture<T> future)

Wraps a future object.

Type Parameters:

T - type of the value

Parameters:

future - future object, could be null

Returns:

deferred value of a future object

of

public static <T> ClickHouseDeferredValue<T> of(CompletableFuture<T> future,
                                                int timeout)

Wraps a future object.

Type Parameters:

T - type of the value

Parameters:

future - future object, could be null

timeout - timeout in milliseconds, zero or negative number means no timeout

Returns:

deferred vaue of a future object

of

public static <T> ClickHouseDeferredValue<T> of(Supplier<T> supplier)

Wraps return value from a supplier function.

Type Parameters:

T - type of the value

Parameters:

supplier - supplier function, could be null

Returns:

deferred value of return value from supplier function

of

public static <T> ClickHouseDeferredValue<T> of(T value,
                                                Class<T> clazz)

Wraps given value as a deferred value.

Type Parameters:

T - type of the value

Parameters:

value - value to wrap

clazz - class of the value

Returns:

deferred value

get

public T get()

Specified by:

get in interface Supplier<T>

getOptional

public Optional<T> getOptional()

Gets optional value, which may or may not be null.

Returns:

optional value