io.grpc

Class ManagedChannelProvider

java.lang.Object

io.grpc.ManagedChannelProvider

@Internal
public abstract class ManagedChannelProvider
extends Object

Provider of managed channels for transport agnostic consumption.

Implementations can be automatically discovered by gRPC via Java's SPI mechanism. For automatic discovery, the implementation must have a zero-argument constructor and include a resource named META-INF/services/io.grpc.ManagedChannelProvider in their JAR. The file's contents should be the implementation's class name.

Implementations should not throw. If they do, it may interrupt class loading. If exceptions may reasonably occur for implementation-specific reasons, implementations should generally handle the exception gracefully and return false from isAvailable().

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ManagedChannelProvider.NewChannelBuilderResult
static class	ManagedChannelProvider.ProviderNotFoundException Thrown when no suitable ManagedChannelProvider objects can be found.

Constructor Summary

Constructors

Constructor and Description
ManagedChannelProvider()

Method Summary

Modifier and Type	Method and Description
protected abstract ManagedChannelBuilder<?>	builderForAddress(String name, int port) Creates a new builder with the given host and port.
protected abstract ManagedChannelBuilder<?>	builderForTarget(String target) Creates a new builder with the given target URI.
protected abstract boolean	isAvailable() Whether this provider is available for use, taking the current environment into consideration.
protected ManagedChannelProvider.NewChannelBuilderResult	newChannelBuilder(String target, ChannelCredentials creds) Creates a new builder with the given target URI and credentials.
protected abstract int	priority() A priority, from 0 to 10 that this provider should be used, taking the current environment into consideration.
static ManagedChannelProvider	provider() Returns the ClassLoader-wide default channel.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ManagedChannelProvider

public ManagedChannelProvider()

Method Detail

provider

public static ManagedChannelProvider provider()

Returns the ClassLoader-wide default channel.

Throws:

ManagedChannelProvider.ProviderNotFoundException - if no provider is available

isAvailable

protected abstract boolean isAvailable()

Whether this provider is available for use, taking the current environment into consideration. If false, no other methods are safe to be called.

priority

protected abstract int priority()

A priority, from 0 to 10 that this provider should be used, taking the current environment into consideration. 5 should be considered the default, and then tweaked based on environment detection. A priority of 0 does not imply that the provider wouldn't work; just that it should be last in line.

builderForAddress

protected abstract ManagedChannelBuilder<?> builderForAddress(String name,
                                                              int port)

Creates a new builder with the given host and port.

builderForTarget

protected abstract ManagedChannelBuilder<?> builderForTarget(String target)

Creates a new builder with the given target URI.

newChannelBuilder

protected ManagedChannelProvider.NewChannelBuilderResult newChannelBuilder(String target,
                                                                           ChannelCredentials creds)

Creates a new builder with the given target URI and credentials. Returns an error-string result if unable to understand the credentials.