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/*
 * Copyright 2017 PingCAP, Inc.
 *
 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.pingcap.tikv.util;

import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import java.net.URI;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;

public class ChannelFactory implements AutoCloseable {
  private final int maxFrameSize;
  private final Map connPool = new ConcurrentHashMap<>();

  public ChannelFactory(int maxFrameSize) {
    this.maxFrameSize = maxFrameSize;
  }

  private ManagedChannel addrToChannel(String addressStr) {
    URI address;
    try {
      address = URI.create("http://" + addressStr);
    } catch (Exception e) {
      throw new IllegalArgumentException("failed to form address " + addressStr);
    }
    // Channel should be lazy without actual connection until first call
    // So a coarse grain lock is ok here
    return ManagedChannelBuilder.forAddress(address.getHost(), address.getPort())
        .maxInboundMessageSize(maxFrameSize)
        .usePlaintext()
        .idleTimeout(60, TimeUnit.SECONDS)
        .build();
  }

  public synchronized ManagedChannel getChannel(String addressStr) {
    ManagedChannel channel = connPool.computeIfAbsent(addressStr, this::addrToChannel);
    if (channel.isShutdown()) {
      return connPool.put(addressStr, addrToChannel(addressStr));
    }
    return channel;
  }

  @Override
  public synchronized void close() {
    connPool.forEach(
        (k, v) -> {
          v.shutdownNow();
          try {
            v.awaitTermination(1, TimeUnit.SECONDS);
          } catch (InterruptedException ignored) {
          }
        });
    connPool.clear();
  }
}