pulsar-client-cpp/lib/CompressionCodec.h

/**
 * Copyright 2016 Yahoo 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.
 */

#ifndef LIB_COMPRESSIONCODEC_H_
#define LIB_COMPRESSIONCODEC_H_

#include <boost/smart_ptr.hpp>

#include <pulsar/Producer.h>

#include "SharedBuffer.h"
#include "PulsarApi.pb.h"

#include <map>

using namespace pulsar;
namespace pulsar {

class CompressionCodec;
class CompressionCodecNone;
class CompressionCodecLZ4;
class CompressionCodecZLib;

class CompressionCodecProvider {
 public:
    static CompressionType convertType(proto::CompressionType type);
    static proto::CompressionType convertType(CompressionType type);

    static CompressionCodec& getCodec(CompressionType compressionType);
 private:
    static CompressionCodecNone compressionCodecNone_;
    static CompressionCodecLZ4 compressionCodecLZ4_;
    static CompressionCodecZLib compressionCodecZLib_;
};

class CompressionCodec {
 public:
    virtual ~CompressionCodec() {
    }

    /**
     * Compress a buffer
     *
     * @param raw
     *            a buffer with the uncompressed content. The reader/writer indexes will not be modified
     * @return a buffer with the compressed content.
     */
    virtual SharedBuffer encode(const SharedBuffer& raw) = 0;

    /**
     * Decompress a buffer.
     *
     * The buffer needs to have been compressed with the matching Encoder.
     *
     * @param encoded
     *            the compressed content
     * @param uncompressedSize
     *            the size of the original content
     * @param decoded
     *             were the result will be passed
     * @return true if the buffer was decompressed, false otherwise
     */
    virtual bool decode(const SharedBuffer& encoded, uint32_t uncompressedSize,
                        SharedBuffer& decoded) = 0;
};

class CompressionCodecNone : public CompressionCodec {
 public:
    SharedBuffer encode(const SharedBuffer& raw);

    bool decode(const SharedBuffer& encoded, uint32_t uncompressedSize, SharedBuffer& decoded);
};

}

#endif /* LIB_COMPRESSIONCODEC_H_ */