org.redisson.codec.MapCacheEventCodec.java Source code

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Here is the source code for org.redisson.codec.MapCacheEventCodec.java

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/**
 * Copyright (c) 2013-2019 Nikita Koksharov
 *
 * 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 org.redisson.codec;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.redisson.client.codec.Codec;
import org.redisson.client.handler.State;
import org.redisson.client.protocol.Decoder;
import org.redisson.client.protocol.Encoder;

import io.netty.buffer.ByteBuf;

/**
 * 
 * @author Nikita Koksharov
 *
 */
public class MapCacheEventCodec implements Codec {

    public enum OSType {
        WINDOWS, HPNONSTOP
    }

    private final Codec codec;
    private final OSType osType;

    private final Decoder<Object> decoder = new Decoder<Object>() {
        @Override
        public Object decode(ByteBuf buf, State state) throws IOException {
            List<Object> result = new ArrayList<Object>(3);

            Object key = MapCacheEventCodec.this.decode(buf, state, codec.getMapKeyDecoder());
            result.add(key);

            Object value = MapCacheEventCodec.this.decode(buf, state, codec.getMapValueDecoder());
            result.add(value);

            if (buf.isReadable()) {
                Object oldValue = MapCacheEventCodec.this.decode(buf, state, codec.getMapValueDecoder());
                result.add(oldValue);
            }

            return result;
        }
    };

    public MapCacheEventCodec(Codec codec, OSType osType) {
        super();
        this.codec = codec;
        this.osType = osType;
    }

    public MapCacheEventCodec(ClassLoader classLoader, MapCacheEventCodec codec) {
        try {
            this.codec = codec.codec.getClass().getConstructor(ClassLoader.class, codec.codec.getClass())
                    .newInstance(classLoader, codec.codec);
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
        this.osType = codec.osType;
    }

    @Override
    public Decoder<Object> getMapValueDecoder() {
        throw new UnsupportedOperationException();
    }

    @Override
    public Encoder getMapValueEncoder() {
        throw new UnsupportedOperationException();
    }

    @Override
    public Decoder<Object> getMapKeyDecoder() {
        throw new UnsupportedOperationException();
    }

    @Override
    public Encoder getMapKeyEncoder() {
        throw new UnsupportedOperationException();
    }

    @Override
    public Decoder<Object> getValueDecoder() {
        return decoder;
    }

    @Override
    public Encoder getValueEncoder() {
        throw new UnsupportedOperationException();
    }

    private Object decode(ByteBuf buf, State state, Decoder<?> decoder) throws IOException {
        int keyLen;
        if (osType == OSType.WINDOWS) {
            keyLen = buf.readIntLE();
        } else if (osType == OSType.HPNONSTOP) {
            keyLen = (int) buf.readLong();
        } else {
            keyLen = (int) buf.readLongLE();
        }
        ByteBuf keyBuf = buf.readSlice(keyLen);
        Object key = decoder.decode(keyBuf, state);
        return key;
    }

    @Override
    public ClassLoader getClassLoader() {
        return getClass().getClassLoader();
    }

    @Override
    @SuppressWarnings("AvoidInlineConditionals")
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((codec == null) ? 0 : codec.hashCode());
        result = prime * result + ((osType == null) ? 0 : osType.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        MapCacheEventCodec other = (MapCacheEventCodec) obj;
        if (codec == null) {
            if (other.codec != null)
                return false;
        } else if (!codec.equals(other.codec))
            return false;
        if (osType != other.osType)
            return false;
        return true;
    }

}