/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.client.lob;
import java.io.IOException;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicInteger;
import org.teiid.client.DQP;
import org.teiid.core.TeiidException;
import org.teiid.core.types.Streamable;
import org.teiid.jdbc.JDBCPlugin;
public class StreamingLobChunckProducer implements LobChunkProducer {
public static class Factory {
private final Streamable<?> streamable;
private final DQP dqp;
private final long requestId;
public Factory(DQP dqp,
long requestId, Streamable<?> streamable) {
super();
this.dqp = dqp;
this.requestId = requestId;
this.streamable = streamable;
}
public StreamingLobChunckProducer getLobChunkProducer() {
return new StreamingLobChunckProducer(dqp, requestId, streamable);
}
}
private static AtomicInteger REQUEST_SEQUENCE = new AtomicInteger(0);
private final Streamable<?> streamable;
private final DQP dqp;
private final long requestId;
private final int streamRequestId = REQUEST_SEQUENCE.getAndIncrement();
public StreamingLobChunckProducer(DQP dqp, long requestId,
Streamable<?> streamable) {
this.dqp = dqp;
this.requestId = requestId;
this.streamable = streamable;
}
public LobChunk getNextChunk() throws IOException {
try {
Future<LobChunk> result = dqp.requestNextLobChunk(streamRequestId, requestId, streamable.getReferenceStreamId());
return result.get();
} catch (Exception e) {
IOException ex = new IOException(JDBCPlugin.Util.getString("StreamImpl.Unable_to_read_data_from_stream", e.getMessage())); //$NON-NLS-1$
ex.initCause(e);
throw ex;
}
}
public void close() throws IOException {
try {
dqp.closeLobChunkStream(streamRequestId, requestId, streamable.getReferenceStreamId());
} catch (TeiidException e) {
IOException ex = new IOException(e.getMessage());
ex.initCause(e);
throw ex;
}
}
}