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The Federation SAIL allows multiple datasets to be virtually combined into a single dataset. The Federation SAIL combines multiple RDF stores that may exist on a remote server or are embedded in the same JVM. The Federation uses query optimizations to distribute sections of the query to different members based on the data contained in each of the members. These results are then joined together within the federation to provide the same result as if all the data was co-located within a single repository.

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/*******************************************************************************
 * Copyright (c) 2015 Eclipse RDF4J contributors, Aduna, and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Distribution License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *******************************************************************************/
package org.eclipse.rdf4j.sail.federation;

import java.util.List;

import org.eclipse.rdf4j.model.IRI;
import org.eclipse.rdf4j.model.Resource;
import org.eclipse.rdf4j.model.Value;
import org.eclipse.rdf4j.repository.RepositoryConnection;
import org.eclipse.rdf4j.sail.SailException;

/**
 * Echos all write operations to all members.
 *
 * @author James Leigh
 */
abstract class AbstractEchoWriteConnection extends AbstractFederationConnection {

	public AbstractEchoWriteConnection(Federation federation, List members) {
		super(federation, members);
	}

	@Override
	public void startTransactionInternal() throws SailException {
		excute(RepositoryConnection::begin);
	}

	@Override
	public void rollbackInternal() throws SailException {
		excute(RepositoryConnection::rollback);
	}

	@Override
	public void commitInternal() throws SailException {
		excute(RepositoryConnection::commit);
	}

	@Override
	public void setNamespaceInternal(final String prefix, final String name) throws SailException {
		excute((RepositoryConnection con) -> {
			con.setNamespace(prefix, name);
		});
	}

	@Override
	public void clearNamespacesInternal() throws SailException {
		excute(RepositoryConnection::clearNamespaces);
	}

	@Override
	public void removeNamespaceInternal(final String prefix) throws SailException {
		excute((RepositoryConnection con) -> {
			con.removeNamespace(prefix);
		});
	}

	@Override
	public void removeStatementsInternal(final Resource subj, final IRI pred, final Value obj,
			final Resource... contexts) throws SailException {
		excute((RepositoryConnection con) -> {
			con.remove(subj, pred, obj, contexts);
		});
	}
}