package com.wd.basemusic.usecase;

import android.os.Handler;

import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * Executes asynchronous tasks using a {@link ThreadPoolExecutor}.
 * <p>
 * See also {@link Executors} for a list of factory methods to create common
 * {@link java.util.concurrent.ExecutorService}s for different scenarios.
 */
public class UseCaseThreadPoolScheduler implements UseCaseScheduler {

  public static final int POOL_SIZE = 2;
  public static final int MAX_POOL_SIZE = 4 * 2;
  public static final int FIXED_POOL_SIZE = 4;
  public static final int TIMEOUT = 30;
  final ThreadPoolExecutor mThreadPoolExecutor;
  private final Handler mHandler = new Handler();

  /**
   * 固定线程数的无界线程池
   */
  public UseCaseThreadPoolScheduler() {
    mThreadPoolExecutor = new ThreadPoolExecutor(FIXED_POOL_SIZE, FIXED_POOL_SIZE, TIMEOUT,
            TimeUnit.SECONDS, new LinkedBlockingQueue<>());
  }

  @Override
  public void execute(Runnable runnable) {
    mThreadPoolExecutor.execute(runnable);
  }

  @Override
  public <V extends UseCase.ResponseValue> void notifyResponse(final V response,
                                                               final UseCase.UseCaseCallback<V> useCaseCallback) {
    mHandler.post(() -> {
      if (null != useCaseCallback) {
        useCaseCallback.onSuccess(response);
      }
    });
  }

  @Override
  public <V extends UseCase.ResponseValue> void onError(
          final UseCase.UseCaseCallback<V> useCaseCallback) {
    mHandler.post(useCaseCallback::onError);
  }

}