| /* |
| * 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.net; |
| |
| import java.util.Map; |
| |
| import org.apache.cassandra.exceptions.RequestFailureReason; |
| import org.apache.cassandra.locator.InetAddressAndPort; |
| |
| /** |
| * implementors of {@link RequestCallback} need to make sure that any public methods |
| * are threadsafe with respect to {@link #onResponse} being called from the message |
| * service. In particular, if any shared state is referenced, making |
| * response alone synchronized will not suffice. |
| */ |
| public interface RequestCallback<T> |
| { |
| /** |
| * @param msg response received. |
| */ |
| void onResponse(Message<T> msg); |
| |
| /** |
| * Called when there is an exception on the remote node or timeout happens |
| */ |
| default void onFailure(InetAddressAndPort from, RequestFailureReason failureReason) |
| { |
| } |
| |
| /** |
| * Returns true if the callback handles failure reporting - in which case the remove host will be asked to |
| * report failures to us in the event of a problem processing the request. |
| * |
| * TODO: this is an error prone method, and we should be handling failures everywhere |
| * so we should probably just start doing that, and remove this method |
| * |
| * @return true if the callback should be invoked on failure |
| */ |
| default boolean invokeOnFailure() |
| { |
| return false; |
| } |
| |
| /** |
| * @return true if this callback is on the read path and its latency should be |
| * given as input to the dynamic snitch. |
| */ |
| default boolean trackLatencyForSnitch() |
| { |
| return false; |
| } |
| |
| static boolean isTimeout(Map<InetAddressAndPort, RequestFailureReason> failureReasonByEndpoint) |
| { |
| // The reason that all must be timeout to be called a timeout is as follows |
| // Assume RF=6, QUORUM, and failureReasonByEndpoint.size() == 3 |
| // R1 -> TIMEOUT |
| // R2 -> TIMEOUT |
| // R3 -> READ_TOO_MANY_TOMBSTONES |
| // Since we got a reply back, and that was a failure, we should return a failure letting the user know. |
| // When all failures are a timeout, then this is a race condition with |
| // org.apache.cassandra.utils.concurrent.Awaitable.await(long, java.util.concurrent.TimeUnit) |
| // The race is that the message expire path runs and expires all messages, this then casues the condition |
| // to signal telling the caller "got all replies!". |
| return failureReasonByEndpoint.values().stream().allMatch(RequestFailureReason.TIMEOUT::equals); |
| } |
| |
| } |