com.hazelcast.internal.memory

Interface GlobalMemoryAccessor

All Superinterfaces:

ByteAccessStrategy<Object>, ConcurrentHeapMemoryAccessor, ConcurrentMemoryAccessor, HeapMemoryAccessor, MemoryAccessor

All Known Implementing Classes:

AlignmentAwareMemoryAccessor, StandardMemoryAccessor

public interface GlobalMemoryAccessor
extends ConcurrentMemoryAccessor, ConcurrentHeapMemoryAccessor, ByteAccessStrategy<Object>

Accessor of global memory, both in CPU's native address space and on the Java heap. Since this is a global, singleton resource, there should be a global singleton instance of each applicable implementation of this interface.

The instance of GlobalMemoryAccessor appropriate to the platform and intended usage can be retrieved from the GlobalMemoryAccessorRegistry by supplying the desired GlobalMemoryAccessorType, or by directly using the constants GlobalMemoryAccessorRegistry.MEM and GlobalMemoryAccessorRegistry.MEM.

This interface also works as a ByteAccessStrategy<Object> with the semantics matching the semantics of Unsafe: when an object is supplied as the "resource", access is relative to that object's base address; when null is supplied, a base address of zero is implied, i.e., the supplied "offset" is treated as the absolute address in CPU's native address space.

See Also:

ByteAccessStrategy, GlobalMemoryAccessorType, GlobalMemoryAccessorRegistry

Field Summary

Fields

Modifier and Type	Field and Description
static int	MEM_COPY_THRESHOLD Maximum size of a block of memory to copy in a single low-level memory-copying operation.

Fields inherited from interface com.hazelcast.internal.memory.HeapMemoryAccessor

ARRAY_BOOLEAN_BASE_OFFSET, ARRAY_BOOLEAN_INDEX_SCALE, ARRAY_BYTE_BASE_OFFSET, ARRAY_BYTE_INDEX_SCALE, ARRAY_CHAR_BASE_OFFSET, ARRAY_CHAR_INDEX_SCALE, ARRAY_DOUBLE_BASE_OFFSET, ARRAY_DOUBLE_INDEX_SCALE, ARRAY_FLOAT_BASE_OFFSET, ARRAY_FLOAT_INDEX_SCALE, ARRAY_INT_BASE_OFFSET, ARRAY_INT_INDEX_SCALE, ARRAY_LONG_BASE_OFFSET, ARRAY_LONG_INDEX_SCALE, ARRAY_OBJECT_BASE_OFFSET, ARRAY_OBJECT_INDEX_SCALE, ARRAY_SHORT_BASE_OFFSET, ARRAY_SHORT_INDEX_SCALE

Method Summary

Methods inherited from interface com.hazelcast.internal.memory.ConcurrentMemoryAccessor

compareAndSwapInt, compareAndSwapLong, compareAndSwapObject, getBooleanVolatile, getByteVolatile, getCharVolatile, getDoubleVolatile, getFloatVolatile, getIntVolatile, getLongVolatile, getShortVolatile, putBooleanVolatile, putByteVolatile, putCharVolatile, putDoubleVolatile, putFloatVolatile, putIntVolatile, putLongVolatile, putOrderedInt, putOrderedLong, putOrderedObject, putShortVolatile

Methods inherited from interface com.hazelcast.internal.memory.MemoryAccessor

copyFromByteArray, copyMemory, copyToByteArray, getBoolean, getByte, getChar, getDouble, getFloat, getInt, getLong, getShort, isBigEndian, putBoolean, putByte, putChar, putDouble, putFloat, putInt, putLong, putShort, setMemory

Methods inherited from interface com.hazelcast.internal.memory.ConcurrentHeapMemoryAccessor

compareAndSwapInt, compareAndSwapLong, compareAndSwapObject, getBooleanVolatile, getByteVolatile, getCharVolatile, getDoubleVolatile, getFloatVolatile, getIntVolatile, getLongVolatile, getObjectVolatile, getShortVolatile, putBooleanVolatile, putByteVolatile, putCharVolatile, putDoubleVolatile, putFloatVolatile, putIntVolatile, putLongVolatile, putObjectVolatile, putOrderedInt, putOrderedLong, putOrderedObject, putShortVolatile

Methods inherited from interface com.hazelcast.internal.memory.HeapMemoryAccessor

arrayBaseOffset, arrayIndexScale, copyMemory, getBoolean, getByte, getChar, getDouble, getFloat, getInt, getLong, getObject, getShort, objectFieldOffset, putBoolean, putByte, putChar, putDouble, putFloat, putInt, putLong, putObject, putShort

Field Detail

MEM_COPY_THRESHOLD

static final int MEM_COPY_THRESHOLD

Maximum size of a block of memory to copy in a single low-level memory-copying operation. The goal is to prevent large periods without a GC safepoint.

See Also:

Constant Field Values