| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.cassandra.service.paxos; |
| |
| import java.util.function.BiFunction; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.config.CassandraRelevantProperties; |
| import org.apache.cassandra.exceptions.RequestFailureReason; |
| import org.apache.cassandra.exceptions.WriteTimeoutException; |
| import org.apache.cassandra.locator.InetAddressAndPort; |
| import org.apache.cassandra.net.Message; |
| import org.apache.cassandra.service.FailureRecordingCallback; |
| |
| import static org.apache.cassandra.exceptions.RequestFailureReason.TIMEOUT; |
| import static org.apache.cassandra.exceptions.RequestFailureReason.UNKNOWN; |
| import static org.apache.cassandra.utils.FBUtilities.getBroadcastAddressAndPort; |
| |
| public abstract class PaxosRequestCallback<T> extends FailureRecordingCallback<T> |
| { |
| private static final Logger logger = LoggerFactory.getLogger(PaxosRequestCallback.class); |
| private static final boolean USE_SELF_EXECUTION = CassandraRelevantProperties.PAXOS_EXECUTE_ON_SELF.getBoolean(); |
| |
| protected abstract void onResponse(T response, InetAddressAndPort from); |
| |
| @Override |
| public void onResponse(Message<T> message) |
| { |
| onResponse(message.payload, message.from()); |
| } |
| |
| protected <I> void executeOnSelf(I parameter, BiFunction<I, InetAddressAndPort, T> execute) |
| { |
| T response; |
| try |
| { |
| response = execute.apply(parameter, getBroadcastAddressAndPort()); |
| if (response == null) |
| return; |
| } |
| catch (Exception ex) |
| { |
| RequestFailureReason reason = UNKNOWN; |
| if (ex instanceof WriteTimeoutException) reason = TIMEOUT; |
| else logger.error("Failed to apply {} locally", parameter, ex); |
| |
| onFailure(getBroadcastAddressAndPort(), reason); |
| return; |
| } |
| |
| onResponse(response, getBroadcastAddressAndPort()); |
| } |
| |
| static boolean shouldExecuteOnSelf(InetAddressAndPort replica) |
| { |
| return USE_SELF_EXECUTION && replica.equals(getBroadcastAddressAndPort()); |
| } |
| } |