org.mule.runtime.api.util

Class LazyLong

java.lang.Object

org.mule.runtime.api.util.LazyLong

All Implemented Interfaces:

LongSupplier

public class LazyLong
extends Object
implements LongSupplier

Provides a native long which may be lazily computed.

The value is only computed on the first invokation of getAsLong() ()}. Subsequent calls to such method will always return the same value.

This class is thread-safe. When invoking getAsLong() ()}, it is guaranteed that the value will be computed only once.

Since:

1.1.3

Constructor Summary

Constructors

Constructor and Description
LazyLong(long value) Creates a new instance which is already initialised with the given value.
LazyLong(LongSupplier supplier) Creates a new instance which lazily obtains its value from the given supplier.

Method Summary

Modifier and Type	Method and Description
<R> R	flatMap(Function<Long,R> function) Applies the given function through the output of getAsLong() ()}.
long	getAsLong() Returns the lazy value.
void	ifComputed(LongConsumer consumer) If the value has already been computed, if passes it to the given consumer.
boolean	isComputed()

Methods inherited from class java.lang.Object

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

Constructor Detail

LazyLong

public LazyLong(LongSupplier supplier)

Creates a new instance which lazily obtains its value from the given supplier. It is guaranteed that Supplier.get() will only be invoked once. Because this class is thread-safe, the supplier is not required to be.

Parameters:

supplier - A Supplier through which the value is obtained

LazyLong

public LazyLong(long value)

Creates a new instance which is already initialised with the given value.

Parameters:

value - the initialization value

Method Detail

getAsLong

public long getAsLong()

Returns the lazy value. If the value has not yet been computed, then it does so

Specified by:

getAsLong in interface LongSupplier

Returns:

the lazy value

isComputed

public boolean isComputed()

Returns:

Whether the value has already been calculated.

ifComputed

public void ifComputed(LongConsumer consumer)

If the value has already been computed, if passes it to the given consumer. This method does not perform any synchronization so keep in mind that dirty reads are possible if this method is being called from one thread while another thread is triggering the value's computation

Parameters:

consumer - a Consumer

flatMap

public <R> R flatMap(Function<Long,R> function)

Applies the given function through the output of getAsLong() ()}. If the value has not already been computed, this method will trigger computation. This method is thread-safe.

Type Parameters:

R - the generic type of the function's output

Parameters:

function - a transformation function

Returns:

a transformed value