Class ConnectionOptions<ConnectionTraits> (2.27.0)

The configuration parameters for client connections.

Constructors

ConnectionOptions()

The default options, using grpc::GoogleDefaultCredentials().

ConnectionOptions(std::shared_ptr< grpc::ChannelCredentials >)

The default options, using an explicit credentials object.

Parameter
Name Description
credentials std::shared_ptr< grpc::ChannelCredentials >

Functions

set_credentials(std::shared_ptr< grpc::ChannelCredentials >)

Change the gRPC credentials value.

Parameter
Name Description
v std::shared_ptr< grpc::ChannelCredentials >
Returns
Type Description
ConnectionOptions &

credentials() const

The gRPC credentials used by clients configured with this object.

Returns
Type Description
std::shared_ptr< grpc::ChannelCredentials >

set_endpoint(std::string)

Change the gRPC endpoint.

In almost all cases the default is the correct endpoint to use. Applications may need to be changed to (1) test against a fake or simulator, or (2) to use a beta or EAP version of the service.

The default value is set by ConnectionTraits::default_endpoint().

Parameter
Name Description
v std::string
Returns
Type Description
ConnectionOptions &

endpoint() const

The endpoint used by clients configured with this object.

Returns
Type Description
std::string const &

num_channels() const

The number of transport channels to create.

Some transports limit the number of simultaneous calls in progress on a channel (for gRPC the limit is 100). Increasing the number of channels thus increases the number of operations that can be in progress in parallel.

The default value is set by ConnectionTraits::default_num_channels().

Returns
Type Description
int

set_num_channels(int)

Set the value for num_channels().

Parameter
Name Description
num_channels int
Returns
Type Description
ConnectionOptions &

tracing_enabled(std::string const &) const

Return whether tracing is enabled for the given component.

The C++ clients can log interesting events to help library and application developers troubleshoot problems. This flag returns true if tracing should be enabled by clients configured with this option.

Parameter
Name Description
component std::string const &
Returns
Type Description
bool

enable_tracing(std::string const &)

Enable tracing for component in clients configured with this object.

Parameter
Name Description
component std::string const &
Returns
Type Description
ConnectionOptions &

disable_tracing(std::string const &)

Disable tracing for component in clients configured with this object.

Parameter
Name Description
component std::string const &
Returns
Type Description
ConnectionOptions &

components() const

Return the set of tracing components.

Returns
Type Description
std::set< std::string > const &

tracing_options() const

Return the options for use when tracing RPCs.

Returns
Type Description
TracingOptions const &

channel_pool_domain() const

Define the gRPC channel domain for clients configured with this object.

In some cases applications may want to use a separate gRPC connections for different clients. gRPC may share the connection used by separate channels created with the same configuration. The client objects created with this object will create gRPC channels configured with grpc.channel_pooling_domain set to the value returned by channel_pool_domain(). gRPC channels with different values for grpc.channel_pooling_domain are guaranteed to use different connections. Note that there is no guarantee that channels with the same value will have the same connection though.

This option might be useful for applications that want to segregate traffic for whatever reason.

Returns
Type Description
std::string const &

set_channel_pool_domain(std::string)

Set the value for channel_pool_domain().

Parameter
Name Description
v std::string
Returns
Type Description
ConnectionOptions &

add_user_agent_prefix(std::string)

Prepend prefix to the user-agent string.

Libraries or services that use Cloud C++ clients may want to set their own user-agent prefix. This can help them develop telemetry information about number of users running particular versions of their system or library.

Parameter
Name Description
prefix std::string
Returns
Type Description
ConnectionOptions &

user_agent_prefix() const

Return the current value for the user agent string.

Returns
Type Description
std::string const &

CreateChannelArguments() const

Create a new grpc::ChannelArguments configured with the options in this object.

The caller would typically pass this argument to grpc::CreateCustomChannel and create one more more gRPC channels.

Returns
Type Description
grpc::ChannelArguments

set_background_thread_pool_size(std::size_t)

Set the number of background threads.

Parameter
Name Description
s std::size_t
Returns
Type Description
ConnectionOptions &

background_thread_pool_size() const

Returns
Type Description
std::size_t

DisableBackgroundThreads(google::cloud::CompletionQueue const &)

Configure the connection to use cq for all background work.

Connections need to perform background work on behalf of the application. Normally they just create a background thread and a CompletionQueue for this work, but the application may need more fine-grained control of their threads. In this case the application can provide the CompletionQueue and it assumes responsibility for creating one or more threads blocked on CompletionQueue::Run().

Parameter
Name Description
cq google::cloud::CompletionQueue const &
Returns
Type Description
ConnectionOptions &

background_threads_factory() const

Returns
Type Description
BackgroundThreadsFactory

Type Aliases

BackgroundThreadsFactory

Alias Of: ::google::cloud::BackgroundThreadsFactory