| /** |
| * Licensed to jclouds, Inc. (jclouds) under one or more |
| * contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. jclouds licenses this file |
| * to you 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.jclouds.rest.suppliers; |
| |
| import static org.jclouds.util.Suppliers2.memoizeWithExpirationOnAbsoluteInterval; |
| |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| import org.jclouds.concurrent.RetryOnTimeOutExceptionSupplier; |
| import org.jclouds.rest.AuthorizationException; |
| |
| import com.google.common.base.Supplier; |
| |
| /** |
| * This will retry the supplier if it encounters a timeout exception, but not if it encounters an |
| * AuthorizationException. |
| * <p/> |
| * A shared exception reference is used so that anyone who encounters an authorizationexception will |
| * be short-circuited. This prevents accounts from being locked out. |
| * |
| * <h3>details</h3> |
| * http://code.google.com/p/google-guice/issues/detail?id=483 guice doesn't remember when singleton |
| * providers throw exceptions. in this case, if the supplier fails with an authorization exception, |
| * it is called again for each provider method that depends on it. To short-circuit this, we |
| * remember the last exception trusting that guice is single-threaded. |
| * |
| * @author Adrian Cole |
| */ |
| public class MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier<T> implements Supplier<T> { |
| private final Supplier<T> delegate; |
| private final long seconds; |
| |
| public MemoizedRetryOnTimeOutButNotOnAuthorizationExceptionSupplier( |
| AtomicReference<AuthorizationException> authException, long seconds, Supplier<T> delegate) { |
| this.delegate = memoizeWithExpirationOnAbsoluteInterval(new RetryOnTimeOutExceptionSupplier<T>( |
| new SetAndThrowAuthorizationExceptionSupplier<T>(delegate, authException)), seconds, TimeUnit.SECONDS); |
| this.seconds = seconds; |
| } |
| |
| @Override |
| public T get() { |
| return delegate.get(); |
| } |
| |
| @Override |
| public String toString() { |
| return "memoizeWithExpiration(" + delegate + ", seconds=" + seconds + ")"; |
| } |
| } |