Google Cloud Spanner v1 API - Class SpannerClientImpl (5.0.0-beta05) 

public sealed class SpannerClientImpl : SpannerClient

Reference documentation and code samples for the Google Cloud Spanner v1 API class SpannerClientImpl.

Spanner client wrapper implementation, for convenient use.

Inheritance

object > SpannerClient > SpannerClientImpl

Namespace

Google.Cloud.Spanner.V1

Assembly

Google.Cloud.Spanner.V1.dll

Remarks

Cloud Spanner API

The Cloud Spanner API can be used to manage sessions and execute transactions on data stored in Cloud Spanner databases.

Constructors

SpannerClientImpl(SpannerClient, SpannerSettings, ILogger)

public SpannerClientImpl(Spanner.SpannerClient grpcClient, SpannerSettings settings, ILogger logger)

Constructs a client wrapper for the Spanner service, with the specified gRPC client and settings.

Parameters
Name Description
grpcClient SpannerSpannerClient

The underlying gRPC client.
settings SpannerSettings

The base SpannerSettings used within this client.
logger ILogger

Optional ILogger to use within this client.

Fields

ResourcePrefixHeader

public const string ResourcePrefixHeader = "google-cloud-resource-prefix"

The name of the header used for efficiently routing requests.

Field Value
Type Description
string
Remarks

This should be set to the database resource name ("projects/{projectId}/instances/{instanceId}/databases/{databaseId}") for any RPC. For non-streaming calls, SpannerClientImpl performs this automatically. This cannot be performed automatically for streaming calls due to the separation between initializing the stream and sending requests, so client code should set the value in a CallSettings. Typically this is performed with either the FromHeader(string, string) factory method or the WithHeader(CallSettings, string, string) extension method.

Properties

GrpcClient

public override Spanner.SpannerClient GrpcClient { get; }

The underlying gRPC Spanner client

Property Value
Type Description
SpannerSpannerClient
Overrides

Methods

BatchCreateSessions(BatchCreateSessionsRequest, CallSettings)

public override BatchCreateSessionsResponse BatchCreateSessions(BatchCreateSessionsRequest request, CallSettings callSettings = null)

Creates multiple new sessions.

This API can be used to initialize a session cache on the clients. See https://goo.gl/TgSFN2 for best practices on session cache management.

Parameters
Name Description
request BatchCreateSessionsRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
BatchCreateSessionsResponse

The RPC response.
Overrides

BatchCreateSessionsAsync(BatchCreateSessionsRequest, CallSettings)

public override Task<BatchCreateSessionsResponse> BatchCreateSessionsAsync(BatchCreateSessionsRequest request, CallSettings callSettings = null)

Creates multiple new sessions.

This API can be used to initialize a session cache on the clients. See https://goo.gl/TgSFN2 for best practices on session cache management.

Parameters
Name Description
request BatchCreateSessionsRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
TaskBatchCreateSessionsResponse

A Task containing the RPC response.
Overrides

BatchWrite(BatchWriteRequest, CallSettings)

public override SpannerClient.BatchWriteStream BatchWrite(BatchWriteRequest request, CallSettings callSettings = null)

Batches the supplied mutation groups in a collection of efficient transactions. All mutations in a group are committed atomically. However, mutations across groups can be committed non-atomically in an unspecified order and thus, they must be independent of each other. Partial failure is possible, i.e., some groups may have been committed successfully, while some may have failed. The results of individual batches are streamed into the response as the batches are applied.

BatchWrite requests are not replay protected, meaning that each mutation group may be applied more than once. Replays of non-idempotent mutations may have undesirable effects. For example, replays of an insert mutation may produce an already exists error or if you use generated or commit timestamp-based keys, it may result in additional rows being added to the mutation's table. We recommend structuring your mutation groups to be idempotent to avoid this issue.

Parameters
Name Description
request BatchWriteRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
SpannerClientBatchWriteStream

The server stream.
Overrides

BeginTransaction(BeginTransactionRequest, CallSettings)

public override Transaction BeginTransaction(BeginTransactionRequest request, CallSettings callSettings = null)

Begins a new transaction. This step can often be skipped: [Read][google.spanner.v1.Spanner.Read], [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql] and [Commit][google.spanner.v1.Spanner.Commit] can begin a new transaction as a side-effect.

Parameters
Name Description
request BeginTransactionRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
Transaction

The RPC response.
Overrides

BeginTransactionAsync(BeginTransactionRequest, CallSettings)

public override Task<Transaction> BeginTransactionAsync(BeginTransactionRequest request, CallSettings callSettings = null)

Begins a new transaction. This step can often be skipped: [Read][google.spanner.v1.Spanner.Read], [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql] and [Commit][google.spanner.v1.Spanner.Commit] can begin a new transaction as a side-effect.

Parameters
Name Description
request BeginTransactionRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
TaskTransaction

A Task containing the RPC response.
Overrides

Commit(CommitRequest, CallSettings)

public override CommitResponse Commit(CommitRequest request, CallSettings callSettings = null)

Commits a transaction. The request includes the mutations to be applied to rows in the database.

Commit might return an ABORTED error. This can occur at any time; commonly, the cause is conflicts with concurrent transactions. However, it can also happen for a variety of other reasons. If Commit returns ABORTED, the caller should re-attempt the transaction from the beginning, re-using the same session.

On very rare occasions, Commit might return UNKNOWN. This can happen, for example, if the client job experiences a 1+ hour networking failure. At that point, Cloud Spanner has lost track of the transaction outcome and we recommend that you perform another read from the database to see the state of things as they are now.

Parameters
Name Description
request CommitRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
CommitResponse

The RPC response.
Overrides

CommitAsync(CommitRequest, CallSettings)

public override Task<CommitResponse> CommitAsync(CommitRequest request, CallSettings callSettings = null)

Commits a transaction. The request includes the mutations to be applied to rows in the database.

Commit might return an ABORTED error. This can occur at any time; commonly, the cause is conflicts with concurrent transactions. However, it can also happen for a variety of other reasons. If Commit returns ABORTED, the caller should re-attempt the transaction from the beginning, re-using the same session.

On very rare occasions, Commit might return UNKNOWN. This can happen, for example, if the client job experiences a 1+ hour networking failure. At that point, Cloud Spanner has lost track of the transaction outcome and we recommend that you perform another read from the database to see the state of things as they are now.

Parameters
Name Description
request CommitRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
TaskCommitResponse

A Task containing the RPC response.
Overrides

CreateSession(CreateSessionRequest, CallSettings)

public override Session CreateSession(CreateSessionRequest request, CallSettings callSettings = null)

Creates a new session. A session can be used to perform transactions that read and/or modify data in a Cloud Spanner database. Sessions are meant to be reused for many consecutive transactions.

Sessions can only execute one transaction at a time. To execute multiple concurrent read-write/write-only transactions, create multiple sessions. Note that standalone reads and queries use a transaction internally, and count toward the one transaction limit.

Active sessions use additional server resources, so it is a good idea to delete idle and unneeded sessions. Aside from explicit deletes, Cloud Spanner may delete sessions for which no operations are sent for more than an hour. If a session is deleted, requests to it return NOT_FOUND.

Idle sessions can be kept alive by sending a trivial SQL query periodically, e.g., "SELECT 1".

Parameters
Name Description
request CreateSessionRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
Session

The RPC response.
Overrides

CreateSessionAsync(CreateSessionRequest, CallSettings)

public override Task<Session> CreateSessionAsync(CreateSessionRequest request, CallSettings callSettings = null)

Creates a new session. A session can be used to perform transactions that read and/or modify data in a Cloud Spanner database. Sessions are meant to be reused for many consecutive transactions.

Sessions can only execute one transaction at a time. To execute multiple concurrent read-write/write-only transactions, create multiple sessions. Note that standalone reads and queries use a transaction internally, and count toward the one transaction limit.

Active sessions use additional server resources, so it is a good idea to delete idle and unneeded sessions. Aside from explicit deletes, Cloud Spanner may delete sessions for which no operations are sent for more than an hour. If a session is deleted, requests to it return NOT_FOUND.

Idle sessions can be kept alive by sending a trivial SQL query periodically, e.g., "SELECT 1".

Parameters
Name Description
request CreateSessionRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
TaskSession

A Task containing the RPC response.
Overrides

DeleteSession(DeleteSessionRequest, CallSettings)

public override void DeleteSession(DeleteSessionRequest request, CallSettings callSettings = null)

Ends a session, releasing server resources associated with it. This will asynchronously trigger cancellation of any operations that are running with this session.

Parameters
Name Description
request DeleteSessionRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Overrides

DeleteSessionAsync(DeleteSessionRequest, CallSettings)

public override Task DeleteSessionAsync(DeleteSessionRequest request, CallSettings callSettings = null)

Ends a session, releasing server resources associated with it. This will asynchronously trigger cancellation of any operations that are running with this session.

Parameters
Name Description
request DeleteSessionRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
Task

A Task containing the RPC response.
Overrides

ExecuteBatchDml(ExecuteBatchDmlRequest, CallSettings)

public override ExecuteBatchDmlResponse ExecuteBatchDml(ExecuteBatchDmlRequest request, CallSettings callSettings = null)

Executes a batch of SQL DML statements. This method allows many statements to be run with lower latency than submitting them sequentially with [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql].

Statements are executed in sequential order. A request can succeed even if a statement fails. The [ExecuteBatchDmlResponse.status][google.spanner.v1.ExecuteBatchDmlResponse.status] field in the response provides information about the statement that failed. Clients must inspect this field to determine whether an error occurred.

Execution stops after the first failed statement; the remaining statements are not executed.

Parameters
Name Description
request ExecuteBatchDmlRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
ExecuteBatchDmlResponse

The RPC response.
Overrides

ExecuteBatchDmlAsync(ExecuteBatchDmlRequest, CallSettings)

public override Task<ExecuteBatchDmlResponse> ExecuteBatchDmlAsync(ExecuteBatchDmlRequest request, CallSettings callSettings = null)

Executes a batch of SQL DML statements. This method allows many statements to be run with lower latency than submitting them sequentially with [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql].

Statements are executed in sequential order. A request can succeed even if a statement fails. The [ExecuteBatchDmlResponse.status][google.spanner.v1.ExecuteBatchDmlResponse.status] field in the response provides information about the statement that failed. Clients must inspect this field to determine whether an error occurred.

Execution stops after the first failed statement; the remaining statements are not executed.

Parameters
Name Description
request ExecuteBatchDmlRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
TaskExecuteBatchDmlResponse

A Task containing the RPC response.
Overrides

ExecuteSql(ExecuteSqlRequest, CallSettings)

public override ResultSet ExecuteSql(ExecuteSqlRequest request, CallSettings callSettings = null)

Executes an SQL statement, returning all results in a single reply. This method cannot be used to return a result set larger than 10 MiB; if the query yields more data than that, the query fails with a FAILED_PRECONDITION error.

Operations inside read-write transactions might return ABORTED. If this occurs, the application should restart the transaction from the beginning. See [Transaction][google.spanner.v1.Transaction] for more details.

Larger result sets can be fetched in streaming fashion by calling [ExecuteStreamingSql][google.spanner.v1.Spanner.ExecuteStreamingSql] instead.

Parameters
Name Description
request ExecuteSqlRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
ResultSet

The RPC response.
Overrides

ExecuteSqlAsync(ExecuteSqlRequest, CallSettings)

public override Task<ResultSet> ExecuteSqlAsync(ExecuteSqlRequest request, CallSettings callSettings = null)

Executes an SQL statement, returning all results in a single reply. This method cannot be used to return a result set larger than 10 MiB; if the query yields more data than that, the query fails with a FAILED_PRECONDITION error.

Operations inside read-write transactions might return ABORTED. If this occurs, the application should restart the transaction from the beginning. See [Transaction][google.spanner.v1.Transaction] for more details.

Larger result sets can be fetched in streaming fashion by calling [ExecuteStreamingSql][google.spanner.v1.Spanner.ExecuteStreamingSql] instead.

Parameters
Name Description
request ExecuteSqlRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
TaskResultSet

A Task containing the RPC response.
Overrides

ExecuteStreamingSql(ExecuteSqlRequest, CallSettings)

public override SpannerClient.ExecuteStreamingSqlStream ExecuteStreamingSql(ExecuteSqlRequest request, CallSettings callSettings = null)

Like [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql], except returns the result set as a stream. Unlike [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql], there is no limit on the size of the returned result set. However, no individual row in the result set can exceed 100 MiB, and no column value can exceed 10 MiB.

Parameters
Name Description
request ExecuteSqlRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
SpannerClientExecuteStreamingSqlStream

The server stream.
Overrides

GetSession(GetSessionRequest, CallSettings)

public override Session GetSession(GetSessionRequest request, CallSettings callSettings = null)

Gets a session. Returns NOT_FOUND if the session does not exist. This is mainly useful for determining whether a session is still alive.

Parameters
Name Description
request GetSessionRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
Session

The RPC response.
Overrides

GetSessionAsync(GetSessionRequest, CallSettings)

public override Task<Session> GetSessionAsync(GetSessionRequest request, CallSettings callSettings = null)

Gets a session. Returns NOT_FOUND if the session does not exist. This is mainly useful for determining whether a session is still alive.

Parameters
Name Description
request GetSessionRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
TaskSession

A Task containing the RPC response.
Overrides

ListSessions(ListSessionsRequest, CallSettings)

public override PagedEnumerable<ListSessionsResponse, Session> ListSessions(ListSessionsRequest request, CallSettings callSettings = null)

Lists all sessions in a given database.

Parameters
Name Description
request ListSessionsRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
PagedEnumerableListSessionsResponseSession

A pageable sequence of Session resources.
Overrides

ListSessionsAsync(ListSessionsRequest, CallSettings)

public override PagedAsyncEnumerable<ListSessionsResponse, Session> ListSessionsAsync(ListSessionsRequest request, CallSettings callSettings = null)

Lists all sessions in a given database.

Parameters
Name Description
request ListSessionsRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
PagedAsyncEnumerableListSessionsResponseSession

A pageable asynchronous sequence of Session resources.
Overrides

PartitionQuery(PartitionQueryRequest, CallSettings)

public override PartitionResponse PartitionQuery(PartitionQueryRequest request, CallSettings callSettings = null)

Creates a set of partition tokens that can be used to execute a query operation in parallel. Each of the returned partition tokens can be used by [ExecuteStreamingSql][google.spanner.v1.Spanner.ExecuteStreamingSql] to specify a subset of the query result to read. The same session and read-only transaction must be used by the PartitionQueryRequest used to create the partition tokens and the ExecuteSqlRequests that use the partition tokens.

Partition tokens become invalid when the session used to create them is deleted, is idle for too long, begins a new transaction, or becomes too old. When any of these happen, it is not possible to resume the query, and the whole operation must be restarted from the beginning.

Parameters
Name Description
request PartitionQueryRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
PartitionResponse

The RPC response.
Overrides

PartitionQueryAsync(PartitionQueryRequest, CallSettings)

public override Task<PartitionResponse> PartitionQueryAsync(PartitionQueryRequest request, CallSettings callSettings = null)

Creates a set of partition tokens that can be used to execute a query operation in parallel. Each of the returned partition tokens can be used by [ExecuteStreamingSql][google.spanner.v1.Spanner.ExecuteStreamingSql] to specify a subset of the query result to read. The same session and read-only transaction must be used by the PartitionQueryRequest used to create the partition tokens and the ExecuteSqlRequests that use the partition tokens.

Partition tokens become invalid when the session used to create them is deleted, is idle for too long, begins a new transaction, or becomes too old. When any of these happen, it is not possible to resume the query, and the whole operation must be restarted from the beginning.

Parameters
Name Description
request PartitionQueryRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
TaskPartitionResponse

A Task containing the RPC response.
Overrides

PartitionRead(PartitionReadRequest, CallSettings)

public override PartitionResponse PartitionRead(PartitionReadRequest request, CallSettings callSettings = null)

Creates a set of partition tokens that can be used to execute a read operation in parallel. Each of the returned partition tokens can be used by [StreamingRead][google.spanner.v1.Spanner.StreamingRead] to specify a subset of the read result to read. The same session and read-only transaction must be used by the PartitionReadRequest used to create the partition tokens and the ReadRequests that use the partition tokens. There are no ordering guarantees on rows returned among the returned partition tokens, or even within each individual StreamingRead call issued with a partition_token.

Partition tokens become invalid when the session used to create them is deleted, is idle for too long, begins a new transaction, or becomes too old. When any of these happen, it is not possible to resume the read, and the whole operation must be restarted from the beginning.

Parameters
Name Description
request PartitionReadRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
PartitionResponse

The RPC response.
Overrides

PartitionReadAsync(PartitionReadRequest, CallSettings)

public override Task<PartitionResponse> PartitionReadAsync(PartitionReadRequest request, CallSettings callSettings = null)

Creates a set of partition tokens that can be used to execute a read operation in parallel. Each of the returned partition tokens can be used by [StreamingRead][google.spanner.v1.Spanner.StreamingRead] to specify a subset of the read result to read. The same session and read-only transaction must be used by the PartitionReadRequest used to create the partition tokens and the ReadRequests that use the partition tokens. There are no ordering guarantees on rows returned among the returned partition tokens, or even within each individual StreamingRead call issued with a partition_token.

Partition tokens become invalid when the session used to create them is deleted, is idle for too long, begins a new transaction, or becomes too old. When any of these happen, it is not possible to resume the read, and the whole operation must be restarted from the beginning.

Parameters
Name Description
request PartitionReadRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
TaskPartitionResponse

A Task containing the RPC response.
Overrides

Read(ReadRequest, CallSettings)

public override ResultSet Read(ReadRequest request, CallSettings callSettings = null)

Reads rows from the database using key lookups and scans, as a simple key/value style alternative to [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql]. This method cannot be used to return a result set larger than 10 MiB; if the read matches more data than that, the read fails with a FAILED_PRECONDITION error.

Reads inside read-write transactions might return ABORTED. If this occurs, the application should restart the transaction from the beginning. See [Transaction][google.spanner.v1.Transaction] for more details.

Larger result sets can be yielded in streaming fashion by calling [StreamingRead][google.spanner.v1.Spanner.StreamingRead] instead.

Parameters
Name Description
request ReadRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
ResultSet

The RPC response.
Overrides

ReadAsync(ReadRequest, CallSettings)

public override Task<ResultSet> ReadAsync(ReadRequest request, CallSettings callSettings = null)

Reads rows from the database using key lookups and scans, as a simple key/value style alternative to [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql]. This method cannot be used to return a result set larger than 10 MiB; if the read matches more data than that, the read fails with a FAILED_PRECONDITION error.

Reads inside read-write transactions might return ABORTED. If this occurs, the application should restart the transaction from the beginning. See [Transaction][google.spanner.v1.Transaction] for more details.

Larger result sets can be yielded in streaming fashion by calling [StreamingRead][google.spanner.v1.Spanner.StreamingRead] instead.

Parameters
Name Description
request ReadRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
TaskResultSet

A Task containing the RPC response.
Overrides

Rollback(RollbackRequest, CallSettings)

public override void Rollback(RollbackRequest request, CallSettings callSettings = null)

Rolls back a transaction, releasing any locks it holds. It is a good idea to call this for any transaction that includes one or more [Read][google.spanner.v1.Spanner.Read] or [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql] requests and ultimately decides not to commit.

Rollback returns OK if it successfully aborts the transaction, the transaction was already aborted, or the transaction is not found. Rollback never returns ABORTED.

Parameters
Name Description
request RollbackRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Overrides

RollbackAsync(RollbackRequest, CallSettings)

public override Task RollbackAsync(RollbackRequest request, CallSettings callSettings = null)

Rolls back a transaction, releasing any locks it holds. It is a good idea to call this for any transaction that includes one or more [Read][google.spanner.v1.Spanner.Read] or [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql] requests and ultimately decides not to commit.

Rollback returns OK if it successfully aborts the transaction, the transaction was already aborted, or the transaction is not found. Rollback never returns ABORTED.

Parameters
Name Description
request RollbackRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
Task

A Task containing the RPC response.
Overrides

StreamingRead(ReadRequest, CallSettings)

public override SpannerClient.StreamingReadStream StreamingRead(ReadRequest request, CallSettings callSettings = null)

Like [Read][google.spanner.v1.Spanner.Read], except returns the result set as a stream. Unlike [Read][google.spanner.v1.Spanner.Read], there is no limit on the size of the returned result set. However, no individual row in the result set can exceed 100 MiB, and no column value can exceed 10 MiB.

Parameters
Name Description
request ReadRequest

The request object containing all of the parameters for the API call.
callSettings CallSettings

If not null, applies overrides to this RPC call.
Returns
Type Description
SpannerClientStreamingReadStream

The server stream.
Overrides