/*
* Copyright (C) 2011, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
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* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
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package org.eclipse.jgit.storage.cassandra;
import static me.prettyprint.hector.api.factory.HFactory.createColumn;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.Callable;
import me.prettyprint.cassandra.serializers.BytesArraySerializer;
import me.prettyprint.hector.api.beans.HColumn;
import me.prettyprint.hector.api.exceptions.HectorException;
import me.prettyprint.hector.api.mutation.MutationResult;
import me.prettyprint.hector.api.mutation.Mutator;
import org.eclipse.jgit.storage.dht.DhtException;
import org.eclipse.jgit.storage.dht.spi.util.AbstractWriteBuffer;
/** Buffers write operations to Cassandra to create larger batches. */
final class CsBuffer extends AbstractWriteBuffer {
private static final BytesArraySerializer S = CassandraDatabase.S;
private final CassandraDatabase db;
private Mutator<byte[]> buf;
CsBuffer(CassandraDatabase db, int bufferSize) {
super(db.getExecutorService(), bufferSize);
this.db = db;
}
void put(String colFam, byte[] key, byte[] col, byte[] val)
throws DhtException {
HColumn<byte[], byte[]> c = createColumn(col, val, S, S);
put(colFam, key, Collections.singletonList(c));
}
void put(String colFam, byte[] key, List<HColumn<byte[], byte[]>> cols)
throws DhtException {
int sz = colFam.length() + key.length;
for (HColumn<byte[], byte[]> col : cols)
sz += col.getName().length + col.getValue().length;
if (add(sz)) {
init();
for (HColumn<byte[], byte[]> col : cols)
buf.addInsertion(key, colFam, col);
queued(sz);
} else {
Mutator<byte[]> op = db.createMutator();
for (HColumn<byte[], byte[]> col : cols)
op.addInsertion(key, colFam, col);
start(op, sz);
}
}
void delete(String colFam, byte[] key, byte[] col) throws DhtException {
int sz = colFam.length() + key.length + col.length;
add(sz);
init();
buf.addDeletion(key, colFam, col, CassandraDatabase.S);
queued(sz);
}
void deleteRow(String colFam, byte[] key) throws DhtException {
int sz = colFam.length() + key.length;
add(sz);
init();
buf.addDeletion(key, colFam, null, CassandraDatabase.S);
queued(sz);
}
private void init() {
if (buf == null)
buf = db.createMutator();
}
@Override
protected void startQueuedOperations(int bufferedByteCount)
throws DhtException {
Mutator<byte[]> op = buf;
buf = null;
start(op, bufferedByteCount);
}
@Override
public void abort() throws DhtException {
buf = null;
super.abort();
}
private void start(final Mutator<byte[]> op, int size) throws DhtException {
start(new Callable<MutationResult>() {
public MutationResult call() throws Exception {
try {
return op.execute();
} catch (HectorException err) {
throw new DhtException(err);
}
}
}, size);
}
}