org.mapdb

Class Store.LongQueue

java.lang.Object

org.mapdb.Store.LongQueue

Enclosing class:

Store

public static final class Store.LongQueue
extends Object

Queue of primitive long. It uses circular buffer of packed longs, so it is very memory efficient. It has two operations put and take, items are placed in FIFO order.

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[]	b
protected int	end
protected int	size
protected int	start

Constructor Summary

Constructors

Constructor and Description
Store.LongQueue()
Store.LongQueue(int size) size is in bytes, each long consumes between 1 to 10 bytes depending on its value

Method Summary

Methods

Modifier and Type	Method and Description
boolean	isEmpty()
boolean	put(long value) Puts value in queue, returns true if queue was not full and value was inserted
long	take() Takes and returns value from queue.

Methods inherited from class java.lang.Object

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

Field Detail

size

protected int size

b

protected byte[] b

start

protected int start

end

protected int end

Constructor Detail

Store.LongQueue

public Store.LongQueue()

Store.LongQueue

public Store.LongQueue(int size)

size is in bytes, each long consumes between 1 to 10 bytes depending on its value

Method Detail

take

public long take()

Takes and returns value from queue. If queue is empty it returns Long.MIN_VALUE.

put

public boolean put(long value)

Puts value in queue, returns true if queue was not full and value was inserted

isEmpty

public boolean isEmpty()