| /** |
| * 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.s4.comm; |
| |
| import java.util.concurrent.Executor; |
| |
| /** |
| * Factory for deserializer executors used in listener pipelines. |
| * <p> |
| * Deserialization is a relatively costly operation, depending on the event type. This operation can be parallelized, |
| * and we provide channel workers an executor for that purpose. |
| * <p> |
| * There are many possible implementations, that may consider various factors, in particular: |
| * <ul> |
| * <li>parallelism |
| * <li>memory usage (directly measured, or inferred from the number of buffered events) |
| * <li>sharing threadpool among channel workers |
| * </ul> |
| * <p> |
| * When related thresholds are reached, deserializer executors may: |
| * <ul> |
| * <li>block: this indirectly blocks the reception of messages for this channel, applying upstream backpressure. |
| * <li>drop messages: a form of load shedding |
| * |
| * |
| */ |
| public interface DeserializerExecutorFactory { |
| |
| Executor create(); |
| |
| } |
