org.apache.druid.frame.allocation

Interface MemoryAllocator

All Known Implementing Classes:

ArenaMemoryAllocator, HeapMemoryAllocator

public interface MemoryAllocator

Allocator of WritableMemory. Not thread safe.

Method Summary

Modifier and Type	Method and Description
Optional<ResourceHolder<org.apache.datasketches.memory.WritableMemory>>	allocate(long size) Allocates a block of memory of capacity .
long	available() Returns the number of bytes available for allocations.
long	capacity() Returns the number of bytes managed by this allocator.

Method Detail

allocate

Optional<ResourceHolder<org.apache.datasketches.memory.WritableMemory>> allocate(long size)

Allocates a block of memory of capacity . Returns empty if no more memory is available. The memory can be freed by closing the returned ResourceHolder. The returned WritableMemory object will use little-endian byte order.

available

long available()

Returns the number of bytes available for allocations. May return Long.MAX_VALUE if there is no inherent limit. This generally does not mean you can actually allocate 9 exabytes.

capacity

long capacity()

Returns the number of bytes managed by this allocator. When no memory has been allocated yet, this is identical to available(). May return Long.MAX_VALUE if there is no inherent limit. This generally does not mean you can actually allocate 9 exabytes.