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#region Copyright notice and license
// Copyright 2015-2016 gRPC authors.
//
// 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.
#endregion
using Grpc.Core.Internal;
using Grpc.Core.Utils;
namespace Grpc.Core
{
/// <summary>
/// Generic base class for client-side stubs.
/// </summary>
public abstract class ClientBase<T> : ClientBase
where T : ClientBase<T>
{
/// <summary>
/// Initializes a new instance of <c>ClientBase</c> class that
/// throws <c>NotImplementedException</c> upon invocation of any RPC.
/// This constructor is only provided to allow creation of test doubles
/// for client classes (e.g. mocking requires a parameterless constructor).
/// </summary>
protected ClientBase() : base()
{
}
/// <summary>
/// Initializes a new instance of <c>ClientBase</c> class.
/// </summary>
/// <param name="configuration">The configuration.</param>
protected ClientBase(ClientBaseConfiguration configuration) : base(configuration)
{
}
/// <summary>
/// Initializes a new instance of <c>ClientBase</c> class.
/// </summary>
/// <param name="channel">The channel to use for remote call invocation.</param>
public ClientBase(Channel channel) : base(channel)
{
}
/// <summary>
/// Initializes a new instance of <c>ClientBase</c> class.
/// </summary>
/// <param name="callInvoker">The <c>CallInvoker</c> for remote call invocation.</param>
public ClientBase(CallInvoker callInvoker) : base(callInvoker)
{
}
/// <summary>
/// Creates a new client that sets host field for calls explicitly.
/// gRPC supports multiple "hosts" being served by a single server.
/// By default (if a client was not created by calling this method),
/// host <c>null</c> with the meaning "use default host" is used.
/// </summary>
public T WithHost(string host)
{
var newConfiguration = this.Configuration.WithHost(host);
return NewInstance(newConfiguration);
}
/// <summary>
/// Creates a new instance of client from given <c>ClientBaseConfiguration</c>.
/// </summary>
protected abstract T NewInstance(ClientBaseConfiguration configuration);
}
/// <summary>
/// Base class for client-side stubs.
/// </summary>
public abstract class ClientBase
{
readonly ClientBaseConfiguration configuration;
readonly CallInvoker callInvoker;
/// <summary>
/// Initializes a new instance of <c>ClientBase</c> class that
/// throws <c>NotImplementedException</c> upon invocation of any RPC.
/// This constructor is only provided to allow creation of test doubles
/// for client classes (e.g. mocking requires a parameterless constructor).
/// </summary>
protected ClientBase() : this(new UnimplementedCallInvoker())
{
}
/// <summary>
/// Initializes a new instance of <c>ClientBase</c> class.
/// </summary>
/// <param name="configuration">The configuration.</param>
protected ClientBase(ClientBaseConfiguration configuration)
{
this.configuration = GrpcPreconditions.CheckNotNull(configuration, "configuration");
this.callInvoker = configuration.CreateDecoratedCallInvoker();
}
/// <summary>
/// Initializes a new instance of <c>ClientBase</c> class.
/// </summary>
/// <param name="channel">The channel to use for remote call invocation.</param>
public ClientBase(Channel channel) : this(new DefaultCallInvoker(channel))
{
}
/// <summary>
/// Initializes a new instance of <c>ClientBase</c> class.
/// </summary>
/// <param name="callInvoker">The <c>CallInvoker</c> for remote call invocation.</param>
public ClientBase(CallInvoker callInvoker) : this(new ClientBaseConfiguration(callInvoker, null))
{
}
/// <summary>
/// Gets the call invoker.
/// </summary>
protected CallInvoker CallInvoker
{
get { return this.callInvoker; }
}
/// <summary>
/// Gets the configuration.
/// </summary>
internal ClientBaseConfiguration Configuration
{
get { return this.configuration; }
}
/// <summary>
/// Represents configuration of ClientBase. The class itself is visible to
/// subclasses, but contents are marked as internal to make the instances opaque.
/// The verbose name of this class was chosen to make name clash in generated code
/// less likely.
/// </summary>
protected internal class ClientBaseConfiguration
{
readonly CallInvoker undecoratedCallInvoker;
readonly string host;
internal ClientBaseConfiguration(CallInvoker undecoratedCallInvoker, string host)
{
this.undecoratedCallInvoker = GrpcPreconditions.CheckNotNull(undecoratedCallInvoker);
this.host = host;
}
internal CallInvoker CreateDecoratedCallInvoker()
{
return new InterceptingCallInvoker(undecoratedCallInvoker, hostInterceptor: (h) => host);
}
internal ClientBaseConfiguration WithHost(string host)
{
GrpcPreconditions.CheckNotNull(host, "host");
return new ClientBaseConfiguration(this.undecoratedCallInvoker, host);
}
}
}
}
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