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#region Copyright notice and license
// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.Collections.Generic;
using Grpc.Core.Internal;
namespace Grpc.Core
{
public delegate void MetadataInterceptorDelegate(Metadata metadata);
/// <summary>
/// Base class for client-side stubs.
/// </summary>
public abstract class ClientBase
{
readonly Channel channel;
public ClientBase(Channel channel)
{
this.channel = channel;
}
/// <summary>
/// Can be used to register a custom header (initial metadata) interceptor.
/// The delegate each time before a new call on this client is started.
/// </summary>
public MetadataInterceptorDelegate HeaderInterceptor
{
get;
set;
}
/// <summary>
/// Channel associated with this client.
/// </summary>
public Channel Channel
{
get
{
return this.channel;
}
}
/// <summary>
/// Creates a new call to given method.
/// </summary>
protected Call<TRequest, TResponse> CreateCall<TRequest, TResponse>(string serviceName, Method<TRequest, TResponse> method, Metadata metadata, DateTime? deadline)
where TRequest : class
where TResponse : class
{
var interceptor = HeaderInterceptor;
if (interceptor != null)
{
metadata = metadata ?? new Metadata();
interceptor(metadata);
metadata.Freeze();
}
return new Call<TRequest, TResponse>(serviceName, method, channel,
metadata ?? Metadata.Empty, deadline ?? DateTime.MaxValue);
}
}
}
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