com.bigdata.bop.fed

Class AllocationContextKey

java.lang.Object

com.bigdata.bop.fed.AllocationContextKey

public abstract class AllocationContextKey
extends Object

The allocation context key groups together allocations onto the same direct ByteBuffers. There are different implementations depending on how it makes sense to group data data for a given query.

See Also:

DirectBufferPoolAllocator.IAllocationContext

Constructor Summary

Constructors

Constructor and Description
AllocationContextKey()

Method Summary

Methods

Modifier and Type	Method and Description
abstract boolean	equals(Object o) Must be overridden.
abstract int	hashCode() Must be overridden.
abstract boolean	hasOperatorScope(int bopId) Return true if the allocation context is scoped to the specified operator.

Methods inherited from class java.lang.Object

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

Constructor Detail

AllocationContextKey

public AllocationContextKey()

Method Detail

hashCode

public abstract int hashCode()

Must be overridden. The queryId must be a part of each hashCode() in order to ensure that the hash codes are well distributed across different queries on the same node.

Overrides:

hashCode in class Object

equals

public abstract boolean equals(Object o)

Must be overridden.

Overrides:

equals in class Object

hasOperatorScope

public abstract boolean hasOperatorScope(int bopId)

Return true if the allocation context is scoped to the specified operator.

Parameters:

bopId - The BOp identifier.