All Downloads are FREE. Search and download functionalities are using the official Maven repository.

io.axoniq.axonserver.connector.impl.GrpcBufferingInterceptor Maven / Gradle / Ivy

/*
 * Copyright (c) 2020. AxonIQ
 *
 * 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 io.axoniq.axonserver.connector.impl;

import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.ForwardingClientCall;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;

/**
 * Interceptor that immediately requests a number of messages from the server, to increase the flow of messages.
 * 

* As an additional message is requested by default each time a message is received, setting an initial request amount * will allow that number of messages to be "in transit" before the server stops sending more. */ public class GrpcBufferingInterceptor implements ClientInterceptor { private final int additionalBuffer; /** * Initialize the interceptor to ask for {@code additionalBuffer} amount of messages from the server. * * @param additionalBuffer the number of messages the server may send before waiting for permits to be renewed */ public GrpcBufferingInterceptor(int additionalBuffer) { this.additionalBuffer = additionalBuffer; } @Override public ClientCall interceptCall(MethodDescriptor method, CallOptions callOptions, Channel next) { ClientCall call = next.newCall(method, callOptions); if (additionalBuffer == 0 || method.getType().serverSendsOneMessage()) { return call; } return new AdditionalMessageRequestingCall<>(call, additionalBuffer); } private static class AdditionalMessageRequestingCall extends ForwardingClientCall.SimpleForwardingClientCall { private final int additionalBuffer; public AdditionalMessageRequestingCall(ClientCall call, int additionalBuffer) { super(call); this.additionalBuffer = additionalBuffer; } @Override public void start(Listener responseListener, Metadata headers) { super.start(responseListener, headers); request(additionalBuffer); } } }





© 2015 - 2024 Weber Informatics LLC | Privacy Policy