com.spotify.folsom.client.binary.SetRequest.java Source code

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Here is the source code for com.spotify.folsom.client.binary.SetRequest.java

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/*
 * Copyright (c) 2014-2015 Spotify AB
 *
 * 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 com.spotify.folsom.client.binary;

import com.spotify.folsom.MemcacheStatus;
import com.spotify.folsom.client.OpCode;
import com.spotify.folsom.client.Utils;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;

import java.io.IOException;
import java.nio.ByteBuffer;

public class SetRequest extends BinaryRequest<MemcacheStatus> implements com.spotify.folsom.client.SetRequest {

    private final byte opcode;
    private final byte[] value;
    private final int ttl;
    private final long cas;

    public SetRequest(final byte opcode, final String key, final byte[] value, final int ttl, final long cas,
            final int opaque) {
        super(key, opaque);
        this.opcode = opcode;
        this.value = value;
        this.ttl = ttl;
        this.cas = cas;
    }

    @Override
    public ByteBuf writeRequest(final ByteBufAllocator alloc, final ByteBuffer dst) {
        final int expiration = Utils.ttlToExpiration(ttl);

        final int keyLength = key.length();

        final int valueLength = value.length;

        final boolean hasExtra = (opcode == OpCode.SET || opcode == OpCode.ADD || opcode == OpCode.REPLACE);

        final int extraLength = hasExtra ? 8 : 0;
        final int totalLength = keyLength + valueLength + extraLength;

        writeBinaryHeader(dst, opcode, keyLength, extraLength, totalLength, cas, opaque);
        if (hasExtra) {
            dst.putInt(0); // byte 24-27, flags
            dst.putInt(expiration); // byte 28-31, expiration
        }
        Utils.writeKeyString(dst, key);
        if (dst.remaining() >= valueLength) {
            dst.put(value);
            return toBuffer(alloc, dst);
        } else {
            return toBufferWithValue(alloc, dst, value);
        }
    }

    private static ByteBuf toBufferWithValue(final ByteBufAllocator alloc, ByteBuffer dst, byte[] value) {
        ByteBuf buffer = toBuffer(alloc, dst, value.length);
        buffer.writeBytes(value);
        return buffer;
    }

    @Override
    public void handle(final BinaryResponse replies) throws IOException {
        ResponsePacket reply = handleSingleReply(replies);

        if (OpCode.getKind(reply.opcode) != OpCode.SET) {
            throw new IOException("Unmatched response");
        }
        MemcacheStatus status = reply.status;

        // Make it compatible with the ascii protocol
        if (status == MemcacheStatus.KEY_EXISTS && opcode == OpCode.ADD) {
            status = MemcacheStatus.ITEM_NOT_STORED;
        } else if (status == MemcacheStatus.KEY_NOT_FOUND
                && (opcode == OpCode.APPEND || opcode == OpCode.PREPEND)) {
            status = MemcacheStatus.ITEM_NOT_STORED;
        }

        succeed(status);
    }

    @Override
    public byte[] getValue() {
        return value;
    }
}