| // Copyright (C) 2019 The Android Open Source Project |
| // |
| // 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.gerrit.server; |
| |
| import com.google.gerrit.exceptions.StorageException; |
| import com.google.gerrit.git.LockFailureException; |
| import com.google.gerrit.server.update.UpdateException; |
| import java.util.Optional; |
| import org.eclipse.jgit.lib.RefUpdate; |
| |
| /** |
| * Class to detect and handle exceptions that are caused by temporary errors, and hence should cause |
| * a retry of the failed operation. |
| */ |
| public class ExceptionHookImpl implements ExceptionHook { |
| @Override |
| public boolean shouldRetry(Throwable throwable) { |
| return isLockFailure(throwable); |
| } |
| |
| @Override |
| public Optional<String> formatCause(Throwable throwable) { |
| if (isLockFailure(throwable)) { |
| return Optional.of(RefUpdate.Result.LOCK_FAILURE.name()); |
| } |
| return Optional.empty(); |
| } |
| |
| private static boolean isLockFailure(Throwable throwable) { |
| if (throwable instanceof UpdateException || throwable instanceof StorageException) { |
| throwable = throwable.getCause(); |
| } |
| return throwable instanceof LockFailureException; |
| } |
| } |