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/*
 * Copyright 2014 the original author or authors.
 *
 * 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 net.kuujo.copycat.protocol;

import net.kuujo.copycat.util.concurrent.Futures;
import net.kuujo.copycat.util.concurrent.NamedThreadFactory;

import java.nio.ByteBuffer;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

/**
 * Local protocol server implementation.
 *
 * @author Jordan Halterman
 */
public class LocalProtocolServer implements ProtocolServer {
  private final Executor executor = Executors.newSingleThreadExecutor(new NamedThreadFactory("copycat-protocol-thread-%d"));
  private final String address;
  private final Map registry;
  private ProtocolHandler handler;

  public LocalProtocolServer(String address, Map registry) {
    this.address = address;
    this.registry = registry;
  }

  @Override
  public void handler(ProtocolHandler handler) {
    this.handler = handler;
  }

  CompletableFuture handle(ByteBuffer request) {
    if (handler == null) {
      return Futures.exceptionalFuture(new ProtocolException("No protocol handler registered"));
    }
    return CompletableFuture.supplyAsync(() -> handler, executor)
      .thenComposeAsync(handler -> handler.apply(request));
  }

  @Override
  public CompletableFuture listen() {
    return CompletableFuture.supplyAsync(() -> {
      registry.put(address, this);
      return null;
    }, executor);
  }

  @Override
  public CompletableFuture close() {
    return CompletableFuture.supplyAsync(() -> {
      registry.remove(address);
      return null;
    }, executor);
  }

}