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

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Here is the source code for com.spotify.folsom.client.binary.IncrRequest.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.google.common.primitives.Longs;
import com.spotify.folsom.MemcacheStatus;
import com.spotify.folsom.client.Utils;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;

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

public class IncrRequest extends BinaryRequest<Long> {
    private final byte opcode;
    private final long by;
    private final long initial;
    private final int ttl;

    public IncrRequest(final String key, final Charset charset, final byte opcode, final long by,
            final long initial, final int ttl) {
        super(key, charset);
        this.opcode = opcode;
        this.by = by;
        this.initial = initial;
        this.ttl = ttl;
    }

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

        final int extraLength = 8 + 8 + 4; // by + initial + expiration

        writeHeader(dst, opcode, extraLength, 0, 0);
        dst.putLong(by);
        dst.putLong(initial);
        dst.putInt(expiration);
        dst.put(key);
        return toBuffer(alloc, dst);
    }

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

        if (reply.status == MemcacheStatus.OK) {
            succeed(Longs.fromByteArray(reply.value));
        } else if (reply.status == MemcacheStatus.KEY_NOT_FOUND) {
            succeed(null);
        } else {
            throw new IOException("Unexpected response: " + reply.status);
        }
    }
}