com.crankuptheamps.client.MemoryPublishStore Maven / Gradle / Ivy
////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2010-2022 60East Technologies Inc., All Rights Reserved.
//
// This computer software is owned by 60East Technologies Inc. and is
// protected by U.S. copyright laws and other laws and by international
// treaties. This computer software is furnished by 60East Technologies
// Inc. pursuant to a written license agreement and may be used, copied,
// transmitted, and stored only in accordance with the terms of such
// license agreement and with the inclusion of the above copyright notice.
// This computer software or any other copies thereof may not be provided
// or otherwise made available to any other person.
//
// U.S. Government Restricted Rights. This computer software: (a) was
// developed at private expense and is in all respects the proprietary
// information of 60East Technologies Inc.; (b) was not developed with
// government funds; (c) is a trade secret of 60East Technologies Inc.
// for all purposes of the Freedom of Information Act; and (d) is a
// commercial item and thus, pursuant to Section 12.212 of the Federal
// Acquisition Regulations (FAR) and DFAR Supplement Section 227.7202,
// Government's use, duplication or disclosure of the computer software
// is subject to the restrictions set forth by 60East Technologies Inc..
//
////////////////////////////////////////////////////////////////////////////
package com.crankuptheamps.client;
import com.crankuptheamps.client.exception.StoreException;
/**
* An in-memory publish store, used to provide republish capability when
* a server fails over.
* Publish stores hold messages until the AMPS server has
* acknowledged that they are persisted. When the client detects disconnection
* and reconnects, the client can republish any messages which have not
* been acknowledged by AMPS.
* Use this PublishStore when you are only concerend about server failover:
* MemoryPublishStore does not protect you in case of subscriber failure,
* because it has no persisted backing store.
*/
public class MemoryPublishStore extends BlockPublishStore
{
/**
* The size of each block the store allocates.
*/
public static final int BLOCK_SIZE = BlockPublishStore.Block.SIZE; //2048
/**
* Construct an in-memory publish store with the specified number of
* blocks as the initial capacity. The initial memory footprint will be
* initialCapacity * BLOCK_SIZE bytes.
* @param initialCapacity the number of blocks to allocate on construction
* @throws StoreException Thrown when an operation fails with details of the failure.
*/
public MemoryPublishStore(int initialCapacity) throws StoreException
{
super(new ArrayStoreBuffer(), initialCapacity, false); // false->no CRCs performed
if (_usedList == null)
{
growFreeListIfEmpty();
}
recover();
}
}