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WritableServerBinding.cs
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WritableServerBinding.cs
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/* Copyright 2013-present MongoDB Inc.
*
* 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.
*/
using System;
using System.Threading;
using System.Threading.Tasks;
using MongoDB.Driver.Core.Clusters;
using MongoDB.Driver.Core.Clusters.ServerSelectors;
using MongoDB.Driver.Core.Misc;
using MongoDB.Driver.Core.Servers;
namespace MongoDB.Driver.Core.Bindings
{
/// <summary>
/// Represents a write binding to a writable server.
/// </summary>
public sealed class WritableServerBinding : IReadWriteBinding
{
// fields
private readonly ICluster _cluster;
private bool _disposed;
private readonly ICoreSessionHandle _session;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="WritableServerBinding" /> class.
/// </summary>
/// <param name="cluster">The cluster.</param>
/// <param name="session">The session.</param>
public WritableServerBinding(ICluster cluster, ICoreSessionHandle session)
{
_cluster = Ensure.IsNotNull(cluster, nameof(cluster));
_session = Ensure.IsNotNull(session, nameof(session));
}
// properties
/// <inheritdoc/>
public ReadPreference ReadPreference
{
get { return ReadPreference.Primary; }
}
/// <inheritdoc/>
public ICoreSessionHandle Session
{
get { return _session; }
}
// methods
/// <inheritdoc/>
public IChannelSourceHandle GetReadChannelSource(CancellationToken cancellationToken)
{
ThrowIfDisposed();
var server = _cluster.SelectServerAndPinIfNeeded(_session, WritableServerSelector.Instance, cancellationToken);
return CreateServerChannelSource(server);
}
/// <inheritdoc/>
public async Task<IChannelSourceHandle> GetReadChannelSourceAsync(CancellationToken cancellationToken)
{
ThrowIfDisposed();
var server = await _cluster.SelectServerAndPinIfNeededAsync(_session, WritableServerSelector.Instance, cancellationToken).ConfigureAwait(false);
return CreateServerChannelSource(server);
}
/// <inheritdoc/>
public IChannelSourceHandle GetWriteChannelSource(CancellationToken cancellationToken)
{
ThrowIfDisposed();
var server = _cluster.SelectServerAndPinIfNeeded(_session, WritableServerSelector.Instance, cancellationToken);
return CreateServerChannelSource(server);
}
/// <inheritdoc/>
public IChannelSourceHandle GetWriteChannelSource(IMayUseSecondaryCriteria mayUseSecondary, CancellationToken cancellationToken)
{
if (IsSessionPinnedToServer())
{
throw new InvalidOperationException($"This overload of {nameof(GetWriteChannelSource)} cannot be called when pinned to a server.");
}
var selector = new WritableServerSelector(mayUseSecondary);
var server = _cluster.SelectServer(selector, cancellationToken);
return CreateServerChannelSource(server);
}
/// <inheritdoc/>
public async Task<IChannelSourceHandle> GetWriteChannelSourceAsync(CancellationToken cancellationToken)
{
ThrowIfDisposed();
var server = await _cluster.SelectServerAndPinIfNeededAsync(_session, WritableServerSelector.Instance, cancellationToken).ConfigureAwait(false);
return CreateServerChannelSource(server);
}
/// <inheritdoc/>
public async Task<IChannelSourceHandle> GetWriteChannelSourceAsync(IMayUseSecondaryCriteria mayUseSecondary, CancellationToken cancellationToken)
{
if (IsSessionPinnedToServer())
{
throw new InvalidOperationException($"This overload of {nameof(GetWriteChannelSource)} cannot be called when pinned to a server.");
}
var selector = new WritableServerSelector(mayUseSecondary);
var server = await _cluster.SelectServerAsync(selector, cancellationToken).ConfigureAwait(false);
return CreateServerChannelSource(server);
}
private IChannelSourceHandle CreateServerChannelSource(IServer server)
{
return new ChannelSourceHandle(new ServerChannelSource(server, _session.Fork()));
}
/// <inheritdoc/>
public void Dispose()
{
if (!_disposed)
{
_session.Dispose();
_disposed = true;
}
}
private bool IsSessionPinnedToServer()
{
return _session.IsInTransaction && _session.CurrentTransaction.PinnedServer != null;
}
private void ThrowIfDisposed()
{
if (_disposed)
{
throw new ObjectDisposedException(GetType().Name);
}
}
}
}