org.apache.tajo.worker.InterDataRetriever.java Source code

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Here is the source code for org.apache.tajo.worker.InterDataRetriever.java

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/**
 * 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.tajo.worker;

import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.apache.tajo.TaskId;
import org.apache.tajo.worker.dataserver.FileAccessForbiddenException;
import org.apache.tajo.worker.dataserver.retriever.DataRetriever;
import org.apache.tajo.worker.dataserver.retriever.FileChunk;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Map;
import java.util.Set;

@Deprecated
public class InterDataRetriever implements DataRetriever {
    private final Log LOG = LogFactory.getLog(InterDataRetriever.class);
    private final Set<TaskId> registered = Sets.newHashSet();
    private final Map<String, String> map = Maps.newConcurrentMap();

    public InterDataRetriever() {
    }

    public void register(TaskId id, String baseURI) {
        synchronized (registered) {
            if (!registered.contains(id)) {
                map.put(id.toString(), baseURI);
                registered.add(id);
            }
        }
    }

    public void unregister(TaskId id) {
        synchronized (registered) {
            if (registered.contains(id)) {
                map.remove(id.toString());
                registered.remove(id);
            }
        }
    }

    /* (non-Javadoc)
     * @see org.apache.tajo.worker.dataserver.retriever.DataRetriever#handle(org.jboss.netty.channel.ChannelHandlerContext, org.jboss.netty.handler.codec.http.HttpRequest)
     */
    @Override
    public FileChunk[] handle(ChannelHandlerContext ctx, HttpRequest request) throws IOException {

        int start = request.getUri().indexOf('?');
        if (start < 0) {
            throw new IllegalArgumentException("Wrong request: " + request.getUri());
        }

        String queryStr = request.getUri().substring(start + 1);
        LOG.info("QUERY: " + queryStr);
        String[] queries = queryStr.split("&");

        String qid = null;
        String fn = null;
        String[] kv;
        for (String query : queries) {
            kv = query.split("=");
            if (kv[0].equals("qid")) {
                qid = kv[1];
            } else if (kv[0].equals("fn")) {
                fn = kv[1];
            }
        }

        String baseDir = map.get(qid);
        if (baseDir == null) {
            throw new FileNotFoundException("No such qid: " + qid);
        }

        File file = new File(baseDir + "/" + fn);
        if (file.isHidden() || !file.exists()) {
            throw new FileNotFoundException("No such file: " + baseDir + "/" + file.getName());
        }
        if (!file.isFile()) {
            throw new FileAccessForbiddenException("No such file: " + baseDir + "/" + file.getName());
        }

        return new FileChunk[] { new FileChunk(file, 0, file.length()) };
    }
}