io.grpc

Class Context.Storage

java.lang.Object

io.grpc.Context.Storage

Enclosing class:

Context

public abstract static class Context.Storage
extends Object

Defines the mechanisms for attaching and detaching the "current" context. The constructor for extending classes must not trigger any activity that can use Context, which includes logging, otherwise it can trigger an infinite initialization loop. Extending classes must not assume that only one instance will be created; Context guarantees it will only use one instance, but it may create multiple and then throw away all but one.

The default implementation will put the current context in a ThreadLocal. If an alternative implementation named io.grpc.override.ContextStorageOverride exists in the classpath, it will be used instead of the default implementation.

This API is experimental and subject to change.

Constructor Summary

Constructors

Constructor and Description
Storage()

Method Summary

Modifier and Type	Method and Description
void	attach(Context toAttach) Deprecated. This is an old API that is no longer used.
abstract Context	current() Implements Context.current().
abstract void	detach(Context toDetach, Context toRestore) Implements Context.detach(io.grpc.Context).
Context	doAttach(Context toAttach) Implements Context.attach().

Methods inherited from class java.lang.Object

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

Constructor Detail

Storage

public Storage()

Method Detail

attach

@Deprecated
public void attach(Context toAttach)

Deprecated. This is an old API that is no longer used.

Unused.

doAttach

public Context doAttach(Context toAttach)

Implements Context.attach().

Caution: Context.attach() interprets a return value of null to mean the same thing as Context.ROOT.

See also: current().

Parameters:

toAttach - the context to be attached

Returns:

A Context that should be passed back into detach(Context, Context) as the toRestore parameter. null is a valid return value, but see caution note.

detach

public abstract void detach(Context toDetach,
                            Context toRestore)

Implements Context.detach(io.grpc.Context).

Parameters:

toDetach - the context to be detached. Should be, or be equivalent to, the current context of the current scope

toRestore - the context to be the current. Should be, or be equivalent to, the context of the outer scope

current

public abstract Context current()

Implements Context.current().

Caution: Context interprets a return value of null to mean the same thing as Context.ROOT.

See also doAttach(Context).

Returns:

The context of the current scope. null is a valid return value, but see caution note.