AsyncRetryExecutorImpl.java

/*
 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Additionally licensed with:
 *
 * 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 org.spf4j.failsafe;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.function.Function;
import java.util.function.Supplier;
import org.spf4j.concurrent.InterruptibleCompletableFuture;
import org.spf4j.failsafe.concurrent.FailSafeExecutor;

/**
 *
 * @author Zoltan Farkas
 */
@SuppressFBWarnings("FCCD_FIND_CLASS_CIRCULAR_DEPENDENCY")
final class AsyncRetryExecutorImpl<T, C extends Callable<? extends T>>
        implements AsyncRetryExecutor<T, C> {

  private final Function<C, RetryPolicy<T, C>> retryPolicy;

  private final Function<C, HedgePolicy> hedgePolicy;

  private final FailSafeExecutor executor;

  AsyncRetryExecutorImpl(final RetryPolicy<T, C> retryPolicy, final HedgePolicy hedgePolicy,
          final FailSafeExecutor executor) {
    this(c -> retryPolicy, c -> hedgePolicy, executor);
  }

  AsyncRetryExecutorImpl(final Function<C, RetryPolicy<T, C>> retryPolicy,
          final Function<C, HedgePolicy> hedgePolicy,
          final FailSafeExecutor executor) {
    this.executor = executor;
    this.retryPolicy = retryPolicy;
    this.hedgePolicy =  hedgePolicy;
  }


  @Override
  public <R extends T, W extends C> Future<R> submit(final W pwhat,
          final long startTimeNanos, final long deadlineNanos) {
    Hedge hedge = hedgePolicy.apply(pwhat).getHedge(startTimeNanos, deadlineNanos);
    int hedgeCount = hedge.getHedgeCount();
    if (hedgeCount <= 0) {
      return (Future<R>) executor.submit(pwhat,
              retryPolicy.apply(pwhat).getRetryPredicate(startTimeNanos, deadlineNanos));
    } else {
      return (Future<R>) executor.submit(pwhat,
              retryPolicy.apply(pwhat).getRetryPredicate(startTimeNanos, deadlineNanos),
              hedgeCount, hedge.getHedgeDelayNanos(), TimeUnit.NANOSECONDS);
    }
  }

  @Override
  @SuppressWarnings("unchecked")
  public <R extends T, W extends C> CompletableFuture<R> submitRx(final W pwhat,
          final long startTimeNanos, final long deadlineNanos,
          final Supplier<InterruptibleCompletableFuture<R>> cfSupplier) {
    Hedge hedge = hedgePolicy.apply(pwhat).getHedge(startTimeNanos, deadlineNanos);
    int hedgeCount = hedge.getHedgeCount();
    if (hedgeCount <= 0) {
      return  executor.submitRx((Callable) pwhat,
              (RetryPredicate) retryPolicy.apply(pwhat).getRetryPredicate(startTimeNanos, deadlineNanos), cfSupplier);
    } else {
      long hedgeDelayNanos = hedge.getHedgeDelayNanos();
      if (hedgeDelayNanos >= (deadlineNanos - startTimeNanos)) {
        return executor.submitRx((Callable) pwhat,
              (RetryPredicate) retryPolicy.apply(pwhat).getRetryPredicate(startTimeNanos, deadlineNanos), cfSupplier);
      }
      return (CompletableFuture<R>) executor.submitRx((Callable) pwhat,
              (RetryPredicate) retryPolicy.apply(pwhat).getRetryPredicate(startTimeNanos, deadlineNanos),
              hedgeCount, hedgeDelayNanos, TimeUnit.NANOSECONDS, cfSupplier);
    }
  }


  public <W extends C> void execute(final W pwhat, final long startTimeNanos, final long deadlineNanos) {
    Hedge hedge = hedgePolicy.apply(pwhat).getHedge(startTimeNanos, deadlineNanos);
    int hedgeCount = hedge.getHedgeCount();
    if (hedgeCount <= 0) {
      executor.execute(pwhat, retryPolicy.apply(pwhat).getRetryPredicate(startTimeNanos, deadlineNanos));
    } else {
      executor.submit(pwhat, retryPolicy.apply(pwhat).getRetryPredicate(startTimeNanos, deadlineNanos),
              hedgeCount, hedge.getHedgeDelayNanos(), TimeUnit.NANOSECONDS);
    }
  }

  @Override
  public String toString() {
    return "AsyncRetryPolicy{" + "executor=" + executor + '}';
  }

  @Override
  public <R extends T, W extends C, EX extends Exception> R call(final W pwhat, final Class<EX> exceptionClass,
          final long startNanos, final long deadlineNanos) throws InterruptedException, TimeoutException, EX {
    return retryPolicy.apply(pwhat).call(pwhat, exceptionClass, startNanos, deadlineNanos);
  }



}