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// This Source Code is in the Public Domain per: http://litesoft.org/License.txt package org.litesoft.sql; import java.util.*; import org.litesoft.core.*; import org.litesoft.core.typeutils.*; import org.litesoft.core.util.*; import org.litesoft.logger.*; import org.litesoft.orsup.base.*; import org.litesoft.orsup.nonpublic.*; public class DemoDataStoreManager { public class Struct { private DataStore mDataStore; private boolean mEmptyDemo; public Struct( DataStore pDataStore, boolean pEmptyDemo ) { mDataStore = pDataStore; mEmptyDemo = pEmptyDemo; } public DataStore getDataStore() { return mDataStore; } public boolean isEmptyDemo() { return mEmptyDemo; } } public static class NoMoreDemoDataStoresAvailableException extends IllegalStateException { public NoMoreDemoDataStoresAvailableException( String pMessage ) { super( pMessage ); } } public static Struct getDemoDS( ContextID pContextID ) { Objects.assertNotNull( "ContextID", pContextID ); DemoDataStoreManager zManager = sInstance; if ( zManager == null ) { throw new Error( "DemoDataStoreManager not created, but attempt to get a Demo DataStore" ); } return zManager.getDSfor( pContextID ); } private static Logger LOGGER = LoggerFactory.getLogger( DemoDataStoreManager.class ); private static volatile DemoDataStoreManager sInstance = null; private DataStore mMasterDataStore; private MetaDataRegistry mMetaDataRegistry; private int mMaxDemoDataStores; private Map<String, DS> mDataStoresByName = new HashMap<String, DS>(); private Map<ContextID, DS> mInUseDataStores = new HashMap<ContextID, DS>(); private Stack<DS> mAvailableDataStores = new Stack<DS>(); public DemoDataStoreManager( DataStore pMasterDataStore, MetaDataRegistry pMetaDataRegistry, int pMaxDemoDataStores ) { mMasterDataStore = pMasterDataStore; mMetaDataRegistry = pMetaDataRegistry; mMaxDemoDataStores = pMaxDemoDataStores; sInstance = this; } private synchronized Struct getDSfor( ContextID pContextID ) { DS zDS = mInUseDataStores.get( pContextID ); if ( zDS != null ) { return new Struct( zDS, false ); } if ( !mAvailableDataStores.isEmpty() ) { zDS = mAvailableDataStores.pop(); } else { int zCurCount = mDataStoresByName.size(); if ( zCurCount == mMaxDemoDataStores ) { throw new NoMoreDemoDataStoresAvailableException( "Demo System Unavailable, Only " + mMaxDemoDataStores + " Simultaneous Demo Users Supported" ); } zDS = new DS( mMasterDataStore, mMetaDataRegistry, "demo_" + zCurCount ); mDataStoresByName.put( zDS.getDBname(), zDS ); } DS zPrevDS = mInUseDataStores.put( pContextID, zDS ); if ( zPrevDS != null ) { LOGGER.error.log( "Duplicate Demo DataStore request from: " + pContextID ); makeAvailable( zPrevDS ); } zDS.setContextID( pContextID ); return new Struct( zDS, true ); } private synchronized void releaseDS( ContextID pContextID ) { DS zDS = mInUseDataStores.remove( pContextID ); if ( zDS != null ) { makeAvailable( zDS ); } } private void makeAvailable( DS pDS ) { pDS.setContextID( null ); pDS.initializeAllTablesForTesting(); pDS.clearAllInstances(); pDS.getChangeListenerManager().clearAllListeners(); mAvailableDataStores.push( pDS ); } private class DS extends DataStoreBaseSQL implements Disposable { private ContextID mContextID = null; private String mDBname; public DS( DataStore pMasterDataStore, MetaDataStore pMetaDataStore, final String pDBname ) { super( createPersistenceFormHelpers( new SQLDBconnectionProvider() { @Override protected void setupDB() { new org.hsqldb.jdbcDriver(); // Force Registration createDriver( "jdbc:hsqldb:mem:" + pDBname, "sa", "" ); } } ), pMetaDataStore ); mDBname = pDBname; createAllTables(); List<NoInstanceFactory<?>> zFactories = pMasterDataStore.getNoInstanceFactories(); for ( NoInstanceFactory<?> zFactory : zFactories ) { setNoInstanceFactory( zFactory ); } } public ContextID getContextID() { return mContextID; } public void setContextID( ContextID pContextID ) { mContextID = pContextID; } public String getDBname() { return mDBname; } @Override public boolean isDemoDataStore() { return true; } @Override public void dispose() { releaseDS( mContextID ); } } } |