All Downloads are FREE. Search and download functionalities are using the official Maven repository.
  • Log In
  • Register

    • com.google.common.util.concurrent.SimpleTimeLimiter Maven / Gradle / Ivy

    Go to download

    This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

    There is a newer version: 35.0.0.Beta1
    Show newest version
    /*
 * Copyright (C) 2006 The Guava 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 com.google.common.util.concurrent;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.Beta;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ObjectArrays;
import com.google.common.collect.Sets;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * A TimeLimiter that runs method calls in the background using an {@link ExecutorService}. If the
 * time limit expires for a given method call, the thread running the call will be interrupted.
 *
 * @author Kevin Bourrillion
 * @author Jens Nyman
 * @since 1.0
 */
@Beta
@GwtIncompatible
public final class SimpleTimeLimiter implements TimeLimiter {

  private final ExecutorService executor;

  private SimpleTimeLimiter(ExecutorService executor) {
    this.executor = checkNotNull(executor);
  }

  /**
   * Creates a TimeLimiter instance using the given executor service to execute method calls.
   *
   * 
    Warning: using a bounded executor may be counterproductive! If the thread pool fills
   * up, any time callers spend waiting for a thread may count toward their time limit, and in this
   * case the call may even time out before the target method is ever invoked.
   *
   * @param executor the ExecutorService that will execute the method calls on the target objects;
   *     for example, a {@link Executors#newCachedThreadPool()}.
   * @since 22.0
   */
  public static SimpleTimeLimiter create(ExecutorService executor) {
    return new SimpleTimeLimiter(executor);
  }

  @Override
  public  T newProxy(
      final T target,
      Class interfaceType,
      final long timeoutDuration,
      final TimeUnit timeoutUnit) {
    checkNotNull(target);
    checkNotNull(interfaceType);
    checkNotNull(timeoutUnit);
    checkPositiveTimeout(timeoutDuration);
    checkArgument(interfaceType.isInterface(), "interfaceType must be an interface type");

    final Set interruptibleMethods = findInterruptibleMethods(interfaceType);

    InvocationHandler handler =
        new InvocationHandler() {
          @Override
          public Object invoke(Object obj, final Method method, final Object[] args)
              throws Throwable {
            Callable callable =
                new Callable() {
                  @Override
                  public Object call() throws Exception {
                    try {
                      return method.invoke(target, args);
                    } catch (InvocationTargetException e) {
                      throw throwCause(e, false /* combineStackTraces */);
                    }
                  }
                };
            return callWithTimeout(
                callable, timeoutDuration, timeoutUnit, interruptibleMethods.contains(method));
          }
        };
    return newProxy(interfaceType, handler);
  }

  // TODO: replace with version in common.reflect if and when it's open-sourced
  private static  T newProxy(Class interfaceType, InvocationHandler handler) {
    Object object =
        Proxy.newProxyInstance(
            interfaceType.getClassLoader(), new Class[] {interfaceType}, handler);
    return interfaceType.cast(object);
  }

  private
   T callWithTimeout(
      Callable callable, long timeoutDuration, TimeUnit timeoutUnit, boolean amInterruptible)
      throws Exception {
    checkNotNull(callable);
    checkNotNull(timeoutUnit);
    checkPositiveTimeout(timeoutDuration);

    Future future = executor.submit(callable);

    try {
      if (amInterruptible) {
        try {
          return future.get(timeoutDuration, timeoutUnit);
        } catch (InterruptedException e) {
          future.cancel(true);
          throw e;
        }
      } else {
        return Uninterruptibles.getUninterruptibly(future, timeoutDuration, timeoutUnit);
      }
    } catch (ExecutionException e) {
      throw throwCause(e, true /* combineStackTraces */);
    } catch (TimeoutException e) {
      future.cancel(true);
      throw new UncheckedTimeoutException(e);
    }
  }

  @CanIgnoreReturnValue
  @Override
  public  T callWithTimeout(Callable callable, long timeoutDuration, TimeUnit timeoutUnit)
      throws TimeoutException, InterruptedException, ExecutionException {
    checkNotNull(callable);
    checkNotNull(timeoutUnit);
    checkPositiveTimeout(timeoutDuration);

    Future future = executor.submit(callable);

    try {
      return future.get(timeoutDuration, timeoutUnit);
    } catch (InterruptedException | TimeoutException e) {
      future.cancel(true /* mayInterruptIfRunning */);
      throw e;
    } catch (ExecutionException e) {
      wrapAndThrowExecutionExceptionOrError(e.getCause());
      throw new AssertionError();
    }
  }

  @CanIgnoreReturnValue
  @Override
  public  T callUninterruptiblyWithTimeout(
      Callable callable, long timeoutDuration, TimeUnit timeoutUnit)
      throws TimeoutException, ExecutionException {
    checkNotNull(callable);
    checkNotNull(timeoutUnit);
    checkPositiveTimeout(timeoutDuration);

    Future future = executor.submit(callable);

    try {
      return Uninterruptibles.getUninterruptibly(future, timeoutDuration, timeoutUnit);
    } catch (TimeoutException e) {
      future.cancel(true /* mayInterruptIfRunning */);
      throw e;
    } catch (ExecutionException e) {
      wrapAndThrowExecutionExceptionOrError(e.getCause());
      throw new AssertionError();
    }
  }

  @Override
  public void runWithTimeout(Runnable runnable, long timeoutDuration, TimeUnit timeoutUnit)
      throws TimeoutException, InterruptedException {
    checkNotNull(runnable);
    checkNotNull(timeoutUnit);
    checkPositiveTimeout(timeoutDuration);

    Future future = executor.submit(runnable);

    try {
      future.get(timeoutDuration, timeoutUnit);
    } catch (InterruptedException | TimeoutException e) {
      future.cancel(true /* mayInterruptIfRunning */);
      throw e;
    } catch (ExecutionException e) {
      wrapAndThrowRuntimeExecutionExceptionOrError(e.getCause());
      throw new AssertionError();
    }
  }

  @Override
  public void runUninterruptiblyWithTimeout(
      Runnable runnable, long timeoutDuration, TimeUnit timeoutUnit) throws TimeoutException {
    checkNotNull(runnable);
    checkNotNull(timeoutUnit);
    checkPositiveTimeout(timeoutDuration);

    Future future = executor.submit(runnable);

    try {
      Uninterruptibles.getUninterruptibly(future, timeoutDuration, timeoutUnit);
    } catch (TimeoutException e) {
      future.cancel(true /* mayInterruptIfRunning */);
      throw e;
    } catch (ExecutionException e) {
      wrapAndThrowRuntimeExecutionExceptionOrError(e.getCause());
      throw new AssertionError();
    }
  }

  private static Exception throwCause(Exception e, boolean combineStackTraces) throws Exception {
    Throwable cause = e.getCause();
    if (cause == null) {
      throw e;
    }
    if (combineStackTraces) {
      StackTraceElement[] combined =
          ObjectArrays.concat(cause.getStackTrace(), e.getStackTrace(), StackTraceElement.class);
      cause.setStackTrace(combined);
    }
    if (cause instanceof Exception) {
      throw (Exception) cause;
    }
    if (cause instanceof Error) {
      throw (Error) cause;
    }
    // The cause is a weird kind of Throwable, so throw the outer exception.
    throw e;
  }

  private static Set findInterruptibleMethods(Class interfaceType) {
    Set set = Sets.newHashSet();
    for (Method m : interfaceType.getMethods()) {
      if (declaresInterruptedEx(m)) {
        set.add(m);
      }
    }
    return set;
  }

  private static boolean declaresInterruptedEx(Method method) {
    for (Class exType : method.getExceptionTypes()) {
      // debate: == or isAssignableFrom?
      if (exType == InterruptedException.class) {
        return true;
      }
    }
    return false;
  }

  private void wrapAndThrowExecutionExceptionOrError(Throwable cause) throws ExecutionException {
    if (cause instanceof Error) {
      throw new ExecutionError((Error) cause);
    } else if (cause instanceof RuntimeException) {
      throw new UncheckedExecutionException(cause);
    } else {
      throw new ExecutionException(cause);
    }
  }

  private void wrapAndThrowRuntimeExecutionExceptionOrError(Throwable cause) {
    if (cause instanceof Error) {
      throw new ExecutionError((Error) cause);
    } else {
      throw new UncheckedExecutionException(cause);
    }
  }

  private static void checkPositiveTimeout(long timeoutDuration) {
    checkArgument(timeoutDuration > 0, "timeout must be positive: %s", timeoutDuration);
  }
}
    
    
    
    

    




    
    
    © 2015 - 2025 Weber Informatics LLC | Privacy Policy