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Various tools for implementing memcached-like RPC messaging.

There is a newer version: 6.0-beta2

/*
 * Copyright (C) 2020 ActiveJ LLC.
 *
 * 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 io.activej.memcache.client;

import io.activej.memcache.protocol.MemcacheRpcMessage.GetRequest;
import io.activej.memcache.protocol.MemcacheRpcMessage.GetResponse;
import io.activej.memcache.protocol.MemcacheRpcMessage.PutRequest;
import io.activej.memcache.protocol.MemcacheRpcMessage.Slice;
import io.activej.promise.Promise;
import io.activej.rpc.client.IRpcClient;

public abstract class AbstractMemcacheClient implements MemcacheClient {
	private final IRpcClient rpcClient;

	protected AbstractMemcacheClient(IRpcClient rpcClient) {
		this.rpcClient = rpcClient;
	}

	protected abstract byte[] encodeKey(K key);

	protected abstract Slice encodeValue(V value);

	protected abstract V decodeValue(Slice slice);

	@Override
	public Promise put(K key, V value, int timeout) {
		PutRequest request = new PutRequest(encodeKey(key), encodeValue(value));
		return rpcClient.sendRequest(request, timeout).toVoid();
	}

	@Override
	public Promise get(K key, int timeout) {
		GetRequest request = new GetRequest(encodeKey(key));
		return rpcClient.sendRequest(request, timeout)
				.map(response -> decodeValue(response.getData()));
	}

	@Override
	public Promise put(K key, V value) {
		PutRequest request = new PutRequest(encodeKey(key), encodeValue(value));
		return rpcClient.sendRequest(request).toVoid();
	}

	@Override
	public Promise get(K key) {
		GetRequest request = new GetRequest(encodeKey(key));
		return rpcClient.sendRequest(request)
				.map(response -> decodeValue(response.getData()));
	}
}