/**
* Copyright 2009 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.katta.lib.mapfile;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import net.sf.katta.client.Client;
import net.sf.katta.client.ClientResult;
import net.sf.katta.client.INodeSelectionPolicy;
import net.sf.katta.util.ClientConfiguration;
import net.sf.katta.util.KattaException;
import net.sf.katta.util.ZkConfiguration;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.log4j.Logger;
/**
* The front end to the MapFile server.
*/
public class MapFileClient implements IMapFileClient {
@SuppressWarnings("unused")
private static final Logger LOG = Logger.getLogger(MapFileClient.class);
private static final long TIMEOUT = 12000;
private Client kattaClient;
public MapFileClient(final INodeSelectionPolicy nodeSelectionPolicy) {
kattaClient = new Client(IMapFileServer.class, nodeSelectionPolicy);
}
public MapFileClient() {
kattaClient = new Client(IMapFileServer.class);
}
public MapFileClient(final ZkConfiguration zkConfig) {
kattaClient = new Client(IMapFileServer.class, zkConfig);
}
public MapFileClient(final INodeSelectionPolicy policy, final ZkConfiguration czkCnfig) {
kattaClient = new Client(IMapFileServer.class, policy, czkCnfig);
}
public MapFileClient(final INodeSelectionPolicy policy, final ZkConfiguration zkConfig,
ClientConfiguration clientConfiguration) {
kattaClient = new Client(IMapFileServer.class, policy, zkConfig, clientConfiguration);
}
// public List<Writable> get(WritableComparable<?> key, String[] shards) throws IOException {
private static final Method GET_METHOD;
private static final int GET_METHOD_SHARD_ARG_IDX = 1;
static {
try {
GET_METHOD = IMapFileServer.class.getMethod("get",
new Class[] { Text.class, String[].class });
} catch (NoSuchMethodException e) {
throw new RuntimeException("Could not find method get() in IMapFileServer!");
}
}
public List<String> get(final String key, final String[] indexNames) throws KattaException {
ClientResult<TextArrayWritable> results = kattaClient.broadcastToIndices(TIMEOUT, true, GET_METHOD, GET_METHOD_SHARD_ARG_IDX, indexNames, new Text(key), null);
if (results.isError()) {
throw results.getKattaException();
}
List<String> stringResults = new ArrayList<String>();
for (TextArrayWritable taw : results.getResults()) {
for (Writable w : taw.array.get()) {
Text text = (Text) w;
stringResults.add(text.toString());
}
}
return stringResults;
}
public void close() {
kattaClient.close();
}
}