| // 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.extensions.annotations.ExtensionPoint; |
| |
| /** |
| * Allows implementors to control how certain exceptions should be handled. |
| * |
| * <p>This interface is intended to be implemented for cluster setups with multiple primary nodes to |
| * control the behavior for handling exceptions that are thrown by a lower layer that handles the |
| * consensus and synchronization between different server nodes. E.g. if an operation fails because |
| * consensus for a Git update could not be achieved (e.g. due to slow responding server nodes) this |
| * interface can be used to retry the request instead of failing it immediately. |
| */ |
| @ExtensionPoint |
| public interface ExceptionHook { |
| /** |
| * Whether an operation should be retried if it failed with the given throwable. |
| * |
| * <p>Only affects operations that are executed with {@link |
| * com.google.gerrit.server.update.RetryHelper}. |
| * |
| * @param throwable throwable that was thrown while executing the operation |
| * @return whether the operation should be retried |
| */ |
| default boolean shouldRetry(Throwable throwable) { |
| return false; |
| } |
| } |