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public interface TransportChannelProviderProvides an interface to either build a TransportChannel or provide a fixed TransportChannel that will be used to make calls to a service.
Implementations of TransportChannelProvider may choose to create a new TransportChannel for each call to #getTransportChannel, or may return a fixed TransportChannel instance.
Callers should use the following pattern to get a channel:
TransportChannelProvider transportChannelProvider = ...;
if (transportChannelProvider.needsHeaders()) {
transportChannelProvider = transportChannelProvider.withHeaders(headers);
}
// optional: set executor for TransportChannel
transportChannelProvider.withExecutor(executor);
TransportChannel transportChannel = transportChannelProvider.getTransportChannel();
Methods
acceptsPoolSize()
public abstract boolean acceptsPoolSize()Reports whether this provider allows pool size customization.
| Type | Description |
| boolean |
getTransportChannel()
public abstract TransportChannel getTransportChannel()Provides a Transport, which could either be a new instance for every call, or the same instance, depending on the implementation.
If #needsExecutor() is true, then #withExecutor(Executor) needs to be called first to provide an executor.
If #needsHeaders() is true, then #withHeaders(Map) needs to be called first to provide headers.
if #needsEndpoint() is true, then #withEndpoint(String) needs to be called first to provide an endpoint.
| Type | Description |
| TransportChannel |
| Type | Description |
| IOException |
getTransportName()
public abstract String getTransportName()The name of the transport.
This string can be used for identifying transports for switching logic.
| Type | Description |
| String |
needsCredentials()
public abstract boolean needsCredentials()True if credentials are needed before channel creation.
| Type | Description |
| boolean |
needsEndpoint()
public abstract boolean needsEndpoint()True if the TransportProvider has no endpoint set.
| Type | Description |
| boolean |
needsExecutor() (deprecated)
public abstract boolean needsExecutor()Deprecated. Channel providers will have default executors if they need one.
True if the TransportProvider needs an executor.
| Type | Description |
| boolean |
needsHeaders()
public abstract boolean needsHeaders()True if the TransportProvider has no headers provided.
| Type | Description |
| boolean |
shouldAutoClose()
public abstract boolean shouldAutoClose()Indicates whether the TransportChannel should be closed by the containing client class.
| Type | Description |
| boolean |
withCredentials(Credentials credentials)
public abstract TransportChannelProvider withCredentials(Credentials credentials)Sets the credentials that will be applied before channel creation.
| Name | Description |
| credentials | com.google.auth.Credentials |
| Type | Description |
| TransportChannelProvider |
withEndpoint(String endpoint)
public abstract TransportChannelProvider withEndpoint(String endpoint)Sets the endpoint to use when constructing a new TransportChannel.
This method should only be called if #needsEndpoint() returns true.
| Name | Description |
| endpoint | String |
| Type | Description |
| TransportChannelProvider |
withExecutor(Executor executor)
public abstract TransportChannelProvider withExecutor(Executor executor)Sets the executor to use when constructing a new TransportChannel.
| Name | Description |
| executor | Executor |
| Type | Description |
| TransportChannelProvider |
withExecutor(ScheduledExecutorService executor) (deprecated)
public abstract TransportChannelProvider withExecutor(ScheduledExecutorService executor)Deprecated. Please use #withExecutor(Executor).
| Name | Description |
| executor | ScheduledExecutorService |
| Type | Description |
| TransportChannelProvider |
withHeaders(Map<String,String> headers)
public abstract TransportChannelProvider withHeaders(Map<String,String> headers)Sets the headers to use when constructing a new TransportChannel.
This method should only be called if #needsHeaders() returns true.
| Name | Description |
| headers | Map<String,String> |
| Type | Description |
| TransportChannelProvider |
withPoolSize(int size)
public abstract TransportChannelProvider withPoolSize(int size)Number of underlying transport channels to open. Calls will be load balanced across them.
| Name | Description |
| size | int |
| Type | Description |
| TransportChannelProvider |