com.crankuptheamps.client.MemoryPublishStore Maven / Gradle / Ivy
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// Copyright (c) 2010-2020 60East Technologies Inc., All Rights Reserved.
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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();
}
}