| 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(); |
| |
| } |
