org.apache.asterix.tools.external.data.RateControlledFileSystemBasedAdapter Maven / Gradle / Ivy

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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.asterix.tools.external.data;

import java.io.IOException;
import java.io.InputStream;
import java.util.Map;

import org.apache.asterix.common.feeds.api.IFeedAdapter;
import org.apache.asterix.external.dataset.adapter.FileSystemBasedAdapter;
import org.apache.asterix.om.types.ARecordType;
import org.apache.hyracks.api.context.IHyracksTaskContext;
import org.apache.hyracks.dataflow.std.file.ITupleParserFactory;

/**
 * An adapter that simulates a feed from the contents of a source file. The file
 * can be on the local file system or on HDFS. The feed ends when the content of
 * the source file has been ingested.
 */

public class RateControlledFileSystemBasedAdapter extends FileSystemBasedAdapter implements IFeedAdapter {

    private static final long serialVersionUID = 1L;
    private FileSystemBasedAdapter coreAdapter;

    public RateControlledFileSystemBasedAdapter(ARecordType atype, Map configuration,
            FileSystemBasedAdapter coreAdapter, String format, ITupleParserFactory parserFactory,
            IHyracksTaskContext ctx) throws Exception {
        super(parserFactory, atype, ctx);
        this.coreAdapter = coreAdapter;
    }

    @Override
    public InputStream getInputStream(int partition) throws IOException {
        return coreAdapter.getInputStream(partition);
    }

    @Override
    public void stop() {
       // ((RateControlledTupleParser) tupleParser).stop();
    }

    @Override
    public DataExchangeMode getDataExchangeMode() {
        return DataExchangeMode.PULL;
    }

    @Override
    public boolean handleException(Exception e) {
        return false;
    }

}