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/*******************************************************************************
* Copyright (c) 2010-2018, Gabor Bergmann, IncQuery Labs Ltd.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.scopes;
import tools.refinery.viatra.runtime.matchers.context.IInputKey;
import tools.refinery.viatra.runtime.matchers.scopes.tables.ITableContext;
import tools.refinery.viatra.runtime.matchers.scopes.tables.ITableWriterBinary;
import tools.refinery.viatra.runtime.matchers.scopes.tables.ITableWriterUnary;
/**
* An abstract storage backend that instantiates tables and coordinates transactions.
*
* <p><strong>EXPERIMENTAL</strong>. This class or interface has been added as
* part of a work in progress. There is no guarantee that this API will
* work or that it will remain the same.
*
* @author Gabor Bergmann
*
* @since 2.1
*/
public interface IStorageBackend {
/**
* Marks the beginning of a transaction.
* In transaction mode, table updates may be temporarily delayed ({@link tools.refinery.viatra.runtime.matchers.scopes.tables.IIndexTable} methods may return stale answers) for better performance.
*/
void startTransaction();
/**
* Marks the end of a transaction.
* Any updates delayed during the transaction must now be flushed.
*/
void finishTransaction();
/**
* Creates an index table for a simple value set.
* @param unique client promises to only insert a given tuple with multiplicity one
*/
ITableWriterUnary.Table<Object> createUnaryTable(IInputKey key, ITableContext tableContext, boolean unique);
/**
* Creates an index table for a simple source-target bidirectional mapping.
* @param unique client promises to only insert a given tuple with multiplicity one
*/
ITableWriterBinary.Table<Object,Object> createBinaryTable(IInputKey key, ITableContext tableContext, boolean unique);
}
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