Finagle uses Contexts, which give you something akin to Java’s ThreadLocalsacross asynchronous code.They give you access to request-scoped state, such as a request’s deadline,throughout the logical life of a request without requiring them to be explicitly passed.Finagle explicitly manages them for you across threads and executioncontexts such as
Future
composition, FuturePools
, Timers
,and in some cases — across the client/server boundary.Contexts can be either local or broadcast.Local contexts do not cross process boundaries while broadcastcontexts may be marshalled and transmitted across process boundaries.
In some contexts, unevaluated operands appear (5.2.8, 5.3.3, 5.3.7, 7.1.6.2). An unevaluated operand is not evaluated. An unevaluated operand is considered a full-expression. Let's look at these in detail. I will use the following declarations in my examples.
Most
Context
usage is hidden behind other APIs, which means you may notrealize you are using this functionality. This example shows how a ClientId
is available within Timer
functions:- Question: Choose One Of The Following Cases Or Contexts From Our Text: (1) Egg And Sperm Donors: Risks And Rewards (pp.357-361) (2) Advances In Reproductive Cloning (pp.361-366) (3) The Calvert Case: A Gestational Surrogate Changes Her Mind (pp.369-370) (4) Plan B And Emergency Contraception (pp.448-451) (5) The 'Partial-Birth Abortion' Controversy (pp.455-459).
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Commonly used instances¶
Because
Context
s are not passed directly into methods, discovery of whichones exist is challenging.To aid with this, here is a listing of some commonly used instances that Finaglemakes available: Sqlpro for oracle 1 0 302.![Contexts 3 7 1 Contexts 3 7 1](https://mac-cdn.softpedia.com/screenshots/Contexts_8.jpg)
Current trace id¶
com.twitter.finagle.tracing.Trace.id
—A broadcast Context
that represents this request’s distributed tracing TraceId
.Current client id¶
com.twitter.finagle.thrift.ClientId.current
—A broadcast Context
that represents the client identifier of a request.Current request deadline¶
com.twitter.finagle.context.Deadline.current
—A broadcast Context
that represents when the request should be completed by.Current retry attempt¶
com.twitter.finagle.context.Retries.current
—A broadcast Context
that represents which retry attempt this request is.Will have attempt
set to 0 if the request is not a retry.Current TLS session¶
com.twitter.finagle.transport.Transport.sslSessionInfo
_A local Context
that represents the Transport
scom.twitter.finagle.ssl.session.SslSessionInfo
. If a TLS session is established,the SslSessionInfo
provides access to the javax.net.ssl.SSLSession
, along withthe sessionId
, cipherSuite
, and both local
and peer
certificates. Thisis an encompassing replacement for com.twitter.finagle.transport.Transport.peerCertificate
.com.twitter.finagle.transport.Transport.peerCertificate
—A local Context
that represents the Transport
sjava.security.cert.Certificate
if a TLS session is established.Upstream Address¶
com.twitter.finagle.context.RemoteInfo.Upstream.addr
—A local Context
that represents the upstream (ingress)java.net.SocketAddress
of the current request.Backup request indicator¶
com.twitter.finagle.context.BackupRequest.wasInitiated
—A broadcast Context
that indicates if the request was initiated by a backuprequest.Creating new Contexts¶
Instances should be immutable or must provide proper memory visibilityso that changes will be seen across thread boundaries.
Care should be taken when creating new broadcast
Context
s as theywill be sent across the entire downstream request graph. Considerationsshould include serialization/deserialization costs, serialized size, andschema evolution.Cosmic Designs U-M faculty reflect on Jim Cogswell's 'Cosmogonic Tattoos,' his series of public window installations in response to the holdings of the U-M Museum of Art and the Kelsey Museum of Archaeology.
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