/** | |
* 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. | |
*/ | |
namespace Kafka.Client.Requests | |
{ | |
using System; | |
using System.Collections.Generic; | |
using System.IO; | |
using Kafka.Client.Messages; | |
using Kafka.Client.Serialization; | |
using Kafka.Client.Utils; | |
/// <summary> | |
/// Constructs a multi-consumer request to send to Kafka. | |
/// </summary> | |
public class MultiFetchRequest : AbstractRequest, IWritable | |
{ | |
public const byte DefaultNumberOfRequestsSize = 2; | |
public const byte DefaultHeaderSize = | |
DefaultRequestSizeSize + DefaultRequestIdSize + DefaultNumberOfRequestsSize; | |
public static int GetRequestLength(IList<FetchRequest> requests, string encoding = DefaultEncoding) | |
{ | |
int requestsLength = 0; | |
foreach (var request in requests) | |
{ | |
requestsLength += FetchRequest.GetRequestAsPartOfMultirequestLength(request.Topic, encoding); | |
} | |
return requestsLength + DefaultHeaderSize; | |
} | |
/// <summary> | |
/// Initializes a new instance of the MultiFetchRequest class. | |
/// </summary> | |
/// <param name="requests">Requests to package up and batch.</param> | |
public MultiFetchRequest(IList<FetchRequest> requests) | |
{ | |
Guard.NotNull(requests, "requests"); | |
ConsumerRequests = requests; | |
int length = GetRequestLength(requests, DefaultEncoding); | |
this.RequestBuffer = new BoundedBuffer(length); | |
this.WriteTo(this.RequestBuffer); | |
} | |
/// <summary> | |
/// Gets or sets the consumer requests to be batched into this multi-request. | |
/// </summary> | |
public IList<FetchRequest> ConsumerRequests { get; set; } | |
public override RequestTypes RequestType | |
{ | |
get | |
{ | |
return RequestTypes.MultiFetch; | |
} | |
} | |
/// <summary> | |
/// Writes content into given stream | |
/// </summary> | |
/// <param name="output"> | |
/// The output stream. | |
/// </param> | |
public void WriteTo(MemoryStream output) | |
{ | |
Guard.NotNull(output, "output"); | |
using (var writer = new KafkaBinaryWriter(output)) | |
{ | |
writer.Write(this.RequestBuffer.Capacity - DefaultRequestSizeSize); | |
writer.Write(this.RequestTypeId); | |
writer.Write((short)this.ConsumerRequests.Count); | |
this.WriteTo(writer); | |
} | |
} | |
/// <summary> | |
/// Writes content into given writer | |
/// </summary> | |
/// <param name="writer"> | |
/// The writer. | |
/// </param> | |
public void WriteTo(KafkaBinaryWriter writer) | |
{ | |
Guard.NotNull(writer, "writer"); | |
foreach (var consumerRequest in ConsumerRequests) | |
{ | |
consumerRequest.WriteTo(writer); | |
} | |
} | |
} | |
} |