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Hide the native memory allocation scheme behind an interface
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community/unsafe/src/main/java/org/neo4j/unsafe/impl/internal/dragons/MemoryAllocator.java
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/* | |||
* Copyright (c) 2002-2017 "Neo Technology," | |||
* Network Engine for Objects in Lund AB [http://neotechnology.com] | |||
* | |||
* This file is part of Neo4j. | |||
* | |||
* Neo4j is free software: you can redistribute it and/or modify | |||
* it under the terms of the GNU General Public License as published by | |||
* the Free Software Foundation, either version 3 of the License, or | |||
* (at your option) any later version. | |||
* | |||
* This program is distributed in the hope that it will be useful, | |||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | |||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |||
* GNU General Public License for more details. | |||
* | |||
* You should have received a copy of the GNU General Public License | |||
* along with this program. If not, see <http://www.gnu.org/licenses/>. | |||
*/ | |||
package org.neo4j.unsafe.impl.internal.dragons; | |||
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/** | |||
* A MemoryAllocator is simple: it only allocates memory, until it itself is finalizable and frees it all in one go. | |||
*/ | |||
public interface MemoryAllocator | |||
{ | |||
static MemoryAllocator createAllocator( long expectedMaxMemory, long alignment ) | |||
{ | |||
return new GrabAllocator( expectedMaxMemory, alignment ); | |||
} | |||
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/** | |||
* @return The sum, in bytes, of all the memory currently allocating through this allocator. | |||
*/ | |||
long sumUsedMemory(); | |||
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/** | |||
* Allocate a contiguous, aligned region of memory of the given size in bytes. | |||
* @param bytes the number of bytes to allocate. | |||
* @return A pointer to the allocated memory. | |||
* @throws OutOfMemoryError if the requested memory could not be allocated. | |||
*/ | |||
long allocateAligned( long bytes ); | |||
} |
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