| // Copyright (C) 2018 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.googlesource.gerrit.plugins.multisite.forwarder; |
| |
| import com.google.gerrit.server.events.Event; |
| import com.google.gerrit.server.events.EventDispatcher; |
| import com.google.gerrit.server.permissions.PermissionBackendException; |
| import com.google.gerrit.server.util.ManualRequestContext; |
| import com.google.gerrit.server.util.OneOffRequestContext; |
| import com.google.gwtorm.server.OrmException; |
| import com.google.inject.Inject; |
| import com.google.inject.Singleton; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Dispatch event to the {@link EventDispatcher}. This class is meant to be used on the receiving |
| * side of the {@link StreamEventForwarder} since it will prevent dispatched event to be forwarded |
| * again causing an infinite forwarding loop between the 2 nodes. |
| */ |
| @Singleton |
| public class ForwardedEventHandler { |
| private static final Logger log = LoggerFactory.getLogger(ForwardedEventHandler.class); |
| |
| private final EventDispatcher dispatcher; |
| private final OneOffRequestContext oneOffCtx; |
| |
| @Inject |
| public ForwardedEventHandler(EventDispatcher dispatcher, OneOffRequestContext oneOffCtx) { |
| this.dispatcher = dispatcher; |
| this.oneOffCtx = oneOffCtx; |
| } |
| |
| /** |
| * Dispatch an event in the local node, event will not be forwarded to the other node. |
| * |
| * @param event The event to dispatch |
| * @throws OrmException If an error occur while retrieving the change the event belongs to. |
| */ |
| public void dispatch(Event event) throws OrmException, PermissionBackendException { |
| try (ManualRequestContext ctx = oneOffCtx.open()) { |
| Context.setForwardedEvent(true); |
| log.debug("dispatching event {}", event.getType()); |
| dispatcher.postEvent(event); |
| } finally { |
| Context.unsetForwardedEvent(); |
| } |
| } |
| } |