com.spotify.folsom.client.Request.java Source code

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

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/*
 * Copyright (c) 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;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Lists;
import com.google.common.util.concurrent.AbstractFuture;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;

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

import static com.google.common.base.Preconditions.checkNotNull;

public abstract class Request<V> extends AbstractFuture<V> {
    protected final byte[] key;

    protected Request(String key, Charset charset) {
        this(encodeKey(key, charset));
    }

    protected Request(byte[] key) {
        this.key = key;
    }

    protected static ByteBuf toBuffer(final ByteBufAllocator alloc, ByteBuffer dst) {
        return toBuffer(alloc, dst, 0);
    }

    public byte[] getKey() {
        return key;
    }

    public abstract ByteBuf writeRequest(final ByteBufAllocator alloc, ByteBuffer dst);

    public void fail(final Throwable e) {
        setException(e);
    }

    public void succeed(final V result) {
        set(result);
    }

    protected static ByteBuf toBuffer(final ByteBufAllocator alloc, ByteBuffer dst, int extra) {
        // TODO (dano): write directly to target buffer
        dst.flip();
        final ByteBuf buffer = alloc.buffer(dst.remaining() + extra);
        buffer.writeBytes(dst);
        return buffer;
    }

    public abstract void handle(Object response) throws IOException;

    @VisibleForTesting
    protected static byte[] encodeKey(String key, Charset charset) {
        checkNotNull(key, "key");
        checkNotNull(charset, "charset");
        byte[] keyBytes = key.getBytes(charset);
        int length = keyBytes.length;
        if (length > 250) {
            throw new IllegalArgumentException("Key is too long: " + key);
        }
        if (length <= 0) {
            throw new IllegalArgumentException("Key is empty");
        }
        for (int i = 0; i < length; i++) {
            final byte c = keyBytes[i];
            if (c >= 0 && c <= 32) {
                throw new IllegalArgumentException("Invalid key: " + key);
            }
        }
        return keyBytes;
    }

    protected static List<byte[]> encodeKeys(List<String> keys, Charset charset) {
        List<byte[]> res = Lists.newArrayListWithCapacity(keys.size());
        for (String key : keys) {
            res.add(encodeKey(key, charset));
        }
        return res;
    }

}