blob: 9c00380132052b62d6c239ee11fbebb3c629c8af [file] [log] [blame]
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.tools.rumen;
import java.io.IOException;
import java.io.InputStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
/**
* Reading JSON-encoded cluster topology and produce the parsed
* {@link LoggedNetworkTopology} object.
*/
public class ClusterTopologyReader {
private LoggedNetworkTopology topology;
private void readTopology(JsonObjectMapperParser<LoggedNetworkTopology> parser)
throws IOException {
try {
topology = parser.getNext();
if (topology == null) {
throw new IOException(
"Input file does not contain valid topology data.");
}
} finally {
parser.close();
}
}
/**
* Constructor.
*
* @param path
* Path to the JSON-encoded topology file, possibly compressed.
* @param conf
* @throws IOException
*/
public ClusterTopologyReader(Path path, Configuration conf)
throws IOException {
JsonObjectMapperParser<LoggedNetworkTopology> parser = new JsonObjectMapperParser<LoggedNetworkTopology>(
path, LoggedNetworkTopology.class, conf);
readTopology(parser);
}
/**
* Constructor.
*
* @param input
* The input stream for the JSON-encoded topology data.
*/
public ClusterTopologyReader(InputStream input) throws IOException {
JsonObjectMapperParser<LoggedNetworkTopology> parser = new JsonObjectMapperParser<LoggedNetworkTopology>(
input, LoggedNetworkTopology.class);
readTopology(parser);
}
/**
* Get the {@link LoggedNetworkTopology} object.
*
* @return The {@link LoggedNetworkTopology} object parsed from the input.
*/
public LoggedNetworkTopology get() {
return topology;
}
}