litesoft
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// This Source Code is in the Public Domain per: http://litesoft.org/License.txt package org.litesoft.sequences; import java.util.*; import org.litesoft.configuration.*; import org.litesoft.core.typeutils.*; public class SequenceSourceByGroup implements SequenceSource { private SequenceBlockSource mSequenceBlockSource; public SequenceSourceByGroup( SequenceBlockSource pSequenceBlockSource ) { Objects.assertNotNull( "SequenceBlockSource", mSequenceBlockSource = pSequenceBlockSource ); } public synchronized void clearAllGroups() { mSequenceProxies.clear(); mSequenceBlockSource.clearAllGroups(); } public synchronized void clear( String pGroup ) { SequenceProxy proxy = mSequenceProxies.remove( pGroup ); if ( proxy != null ) { proxy.clear(); } } public void preallocateNextSequenceNumbers( String pGroup, int pBlockSize, Long pRestartAt ) { getSequenceProxy( pGroup ).preallocateNextSequenceNumbers( (pBlockSize < 1) ? 1 : pBlockSize, pRestartAt ); } public long getNextSequenceNumber( String pGroup, Long pRestartAt ) { return getSequenceProxy( pGroup ).getNextSequenceNumber( pRestartAt ); } public long getNextSequenceNumber( String pGroup ) { return getNextSequenceNumber( pGroup, null ); } public long getNextSequenceNumber( Class pGroup ) { return getNextSequenceNumber( pGroup.getName() ); } private synchronized SequenceProxy getSequenceProxy( String pSequencePoolName ) { SequenceProxy proxy = mSequenceProxies.get( pSequencePoolName ); if ( proxy == null ) { proxy = new SequenceProxy( pSequencePoolName ); mSequenceProxies.put( pSequencePoolName, proxy ); } return proxy; } private Map<String, SequenceProxy> mSequenceProxies = new HashMap<String, SequenceProxy>(); private class SequenceProxy { private String mGroup; private SequenceBlock mBlock = SequenceBlockImpl.INITIAL; private int mBlockSize = 100; public SequenceProxy( String pGroup ) { mGroup = pGroup; int bs = Configuration.getInteger( pGroup + ".blocksize", -1 ); if ( bs < 1 ) { bs = Configuration.getInteger( "blocksize", 100 ); } if ( bs > 0 ) { mBlockSize = bs; } } public synchronized void preallocateNextSequenceNumbers( int pBlockSize, Long pRestartAt ) { if ( pBlockSize > mBlock.available() ) { mBlock = SequenceBlockChain.create( mBlock, // mSequenceBlockSource.getNextBlock( mGroup, mBlock.getCurBlockEndExclusive(), pBlockSize - mBlock.available(), pRestartAt ) ); } } public synchronized void clear() { mBlock = SequenceBlockImpl.INITIAL; mSequenceBlockSource.clear( mGroup ); } public synchronized long getNextSequenceNumber( Long pRestartAt ) { if ( !mBlock.hasMore() ) { mBlock = mSequenceBlockSource.getNextBlock( mGroup, mBlock.getCurBlockEndExclusive(), mBlockSize, pRestartAt ); } return mBlock.next(); } } } |