/*
* Copyright 2014 Higher Frequency Trading
*
* http://www.higherfrequencytrading.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.openhft.lang.arena;
import net.openhft.lang.io.Bytes;
import net.openhft.lang.io.NativeBytes;
import net.openhft.lang.io.OffHeapLock;
/**
* Created by peter.lawrey on 20/06/14.
*/
public interface Arena {
enum Mode {
SINGLE_BLOCK, CONTINUOUS_BLOCKS, LINKED_BLOCKS
}
Mode getMode();
OffHeapLock readLock();
OffHeapLock writeLock();
// log2(allocation multiple)
int blockSizeBits();
// allocate a block of memory
int /* handle */ allocate(int hash, int sizeInBlocks);
// resize a block of memory
int /* new handle */ reallocate(int hash, int handle, int sizeInBlocks);
// free a block of memory
void free(int hash, int handle, int sizeInBlocks);
// read to data stored.
void copyTo(Bytes bytes, int handle);
// read from data stored
void copyFrom(int handle, Bytes bytes);
// map the data directly.
void setBytes(int handle, NativeBytes bytes) throws IllegalStateException;
// start a hash lookup
int firstHandleFor(int hash);
// next hash or 0
int nextHandle();
// metrics
int handlesUsed();
int handlesCapacity();
int entriesUsed();
int entriesCapacity();
}