mirror of
https://github.com/OpenHFT/Chronicle-Map.git
synced 2021-09-13 01:26:12 +00:00
106 lines
4.0 KiB
Java
106 lines
4.0 KiB
Java
/*
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* Copyright 2012-2018 Chronicle Map Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.openhft.chronicle.hash.impl;
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import net.openhft.chronicle.core.Memory;
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import net.openhft.chronicle.core.OS;
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/**
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* The reason why this is not implemented via value interface, and offsets are allocated by hand --
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* this functionality is accessed concurrently from many threads, and native value implementations
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* are stateful - so need to keep an instance in thread local that seems to be overall more pain
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* than gain.
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*/
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public enum TierCountersArea {
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;
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public static final long NEXT_TIER_INDEX_OFFSET = 0L;
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public static final long PREV_TIER_INDEX_OFFSET = NEXT_TIER_INDEX_OFFSET + 8L;
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public static final long LOWEST_POSSIBLY_FREE_CHUNK_TIERED_OFFSET = PREV_TIER_INDEX_OFFSET + 8L;
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public static final long SEGMENT_INDEX_OFFSET = LOWEST_POSSIBLY_FREE_CHUNK_TIERED_OFFSET + 8L;
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public static final long TIER_OFFSET = SEGMENT_INDEX_OFFSET + 4L;
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public static final long ENTRIES_OFFSET = TIER_OFFSET + 4L;
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public static final long DELETED_OFFSET = ENTRIES_OFFSET + 4L;
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private static final long UNSIGNED_INT_MASK = 0xFFFFFFFFL;
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private static Memory memory = OS.memory();
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public static long nextTierIndex(long address) {
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return memory.readLong(address + NEXT_TIER_INDEX_OFFSET);
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}
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public static void nextTierIndex(long address, long nextTierIndex) {
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memory.writeLong(address + NEXT_TIER_INDEX_OFFSET, nextTierIndex);
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}
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public static long lowestPossiblyFreeChunkTiered(long address) {
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return memory.readLong(address + LOWEST_POSSIBLY_FREE_CHUNK_TIERED_OFFSET);
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}
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public static void lowestPossiblyFreeChunkTiered(long address, long lowestPossiblyFreeChunk) {
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memory.writeLong(address + LOWEST_POSSIBLY_FREE_CHUNK_TIERED_OFFSET,
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lowestPossiblyFreeChunk);
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}
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public static long prevTierIndex(long address) {
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return memory.readLong(address + PREV_TIER_INDEX_OFFSET);
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}
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public static void prevTierIndex(long address, long prevTierIndex) {
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memory.writeLong(address + PREV_TIER_INDEX_OFFSET, prevTierIndex);
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}
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public static int segmentIndex(long address) {
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return memory.readInt(address + SEGMENT_INDEX_OFFSET);
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}
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public static void segmentIndex(long address, int segmentIndex) {
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memory.writeInt(address + SEGMENT_INDEX_OFFSET, segmentIndex);
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}
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public static int tier(long address) {
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return memory.readInt(address + TIER_OFFSET);
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}
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public static void tier(long address, int tier) {
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memory.writeInt(address + TIER_OFFSET, tier);
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}
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public static long entries(long address) {
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return memory.readInt(address + ENTRIES_OFFSET) & UNSIGNED_INT_MASK;
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}
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public static void entries(long address, long entries) {
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if (entries >= (1L << 32)) {
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throw new IllegalStateException("tier entries overflow: up to " + UNSIGNED_INT_MASK +
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" supported, " + entries + " given");
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}
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memory.writeInt(address + ENTRIES_OFFSET, (int) entries);
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}
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public static long deleted(long address) {
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return memory.readInt(address + DELETED_OFFSET) & UNSIGNED_INT_MASK;
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}
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public static void deleted(long address, long deleted) {
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if (deleted >= (1L << 32)) {
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throw new IllegalStateException("tier deleted entries count overflow: up to " +
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UNSIGNED_INT_MASK + " supported, " + deleted + " given");
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}
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memory.writeInt(address + DELETED_OFFSET, (int) deleted);
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}
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}
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