co.cask.cdap.data.stream.service.upload.LengthBasedContentWriterFactory.java Source code

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Here is the source code for co.cask.cdap.data.stream.service.upload.LengthBasedContentWriterFactory.java

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/*
 * Copyright  2015 Cask Data, Inc.
 *
 * 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 co.cask.cdap.data.stream.service.upload;

import co.cask.cdap.data.stream.service.ConcurrentStreamWriter;
import co.cask.cdap.data2.transaction.stream.StreamConfig;
import co.cask.cdap.proto.Id;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

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

/**
 * A {@link ContentWriterFactory} that creates {@link LengthBasedContentWriter} that buffers write requests in memory
 * until a threshold and then switches to writing events to file directly.
 */
public final class LengthBasedContentWriterFactory implements ContentWriterFactory {

    private final StreamConfig streamConfig;
    private final ConcurrentStreamWriter streamWriter;
    private final Map<String, String> headers;
    private final long bufferThreshold;

    public LengthBasedContentWriterFactory(StreamConfig streamConfig, ConcurrentStreamWriter streamWriter,
            Map<String, String> headers, long bufferThreshold) {
        this.streamConfig = streamConfig;
        this.streamWriter = streamWriter;
        this.headers = ImmutableMap.copyOf(headers);
        this.bufferThreshold = bufferThreshold;
    }

    @Override
    public Id.Stream getStream() {
        return streamConfig.getStreamId();
    }

    @Override
    public ContentWriter create(Map<String, String> headers) throws IOException {
        Map<String, String> allHeaders = Maps.newHashMap(this.headers);
        allHeaders.putAll(headers);
        return new LengthBasedContentWriter(streamConfig, streamWriter, allHeaders, bufferThreshold);
    }
}