Async servers and clients in Rest.li

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Async servers and clients in
Rest.li
1

(Please read the speaker notes)
2

What is this Rest.li thing
you speak about?
“Rest.li is an open source REST framework for building robust,
scalable RES...

The Stack
Rest.li Data and REST API
D2 Dynamic Discovery and load balancing
R2 Network communication
4

What do you by mean
by async?
5

What do you mean by
async (I/O)?
6
Request 1
Request 2
Blocked on I/O
Time
Sync Async
Free CPU

Rest.li is async and non-blocking
under the hood!
7

Rest.li
D2
R2
8

How is R2 async and
non-blocking?
• Netty based async client
• Jetty based server – configuration change (link) needed ...

How is D2 async and
non-blocking?
• All communication with ZooKeeper uses the asynchronous
APIs
• ZooKeeper pushes dat...

How is Rest.li async
and non-blocking?
• Does not handle I/O
• I/O is taken care of by R2
• R2 is async and non-blocki...

Async Rest.li Servers
12

Async Server
Implementations
• The Rest.li framework is async and non-blocking under the
hood.
• As a result of this, ...

Async Server
Implementations -
Options
1. Callback based
2. ParSeq based
14

Async Server – Callback
@RestMethod.Get
public void get(final Long id, @CallbackParam final Callback<Greeting>
callback...

Async Server –
Callback Signature
@RestMethod.Get
public void get(final Long id, @CallbackParam
final Callback<Greetin...

$Async Server – Filling out the callback _zkClient.getData(path, false, new DataCallback() { public void processResult(i...$

Async Server – Callback
@RestMethod.Get
public void get(final Long id, @CallbackParam final Callback<Greeting>
callback...

Async server - ParSeq
19

Key ParSeq Concepts
• Promise Fully async Java Future + listener mechanism.
• Task Basic unit of work that is similar to...

Async Server – ParSeq
@RestMethod.Get
public Task<Greeting> get(final Long id) {
final Task<FileData> fileDataTask = bu...

Async Server – ParSeq
signature
@RestMethod.Get
public Task<Greeting> get(final Long id)
22

Async Server – ParSeq body
final Task<FileData> fileDataTask = buildFileDataTask();
23

Async Server – ParSeq body
final Task<Greeting> mainTask = Tasks.callable("main", new
Callable<Greeting>() {
@Override ...

Async Server –
assembling the Tasks
return Tasks.seq(fileDataTask, mainTask);
25
fileDataTask mainTask

Async Server – ParSeq
@RestMethod.Get
public Task<Greeting> get(final Long id) {
final Task<FileData> fileDataTask = bu...

Async Server – ParSeq
• Can use this approach to build complex call graphs and
return the final Task. (more on this late...

Async Rest.li Clients
28

Async Rest.li requests
• RestClient is async and non-blocking under the hood – it
uses ParSeq and Netty.
• Applications...

Async Rest.li requests
Two Options:
1. Callback based API
2. Use a ParSeqRestClient – This is a wrapper around a
RestC...

Async Rest.li requests
– Callbacks
Callback<Response<Greeting>> cb = new Callback() {
void onSuccess(Response<Greeting>...

Async Rest.li requests – defining
a Callback
Callback<Response<Greeting>> callback = new
Callback() {
void onSuccess(R...

Async Rest.li requests – sending
the request
Request<Greeting> getRequest =
BUILDERS.get().id(1L).build();
_restClient...

Async Rest.li requests – using
ParSeq
• Callback based API is good for simple use cases (one or two
requests and you ar...

Async Rest.li requests – using
ParSeq
a1 a2 a3
b1 b2
c1
35

Async Rest.li requests – using
ParSeq
Task<Response<?>> a1ResponseTask =
_parseqRestClient.createTask(a1Request);
Task...

Async Rest.li requests – using
ParSeq
Task<Response<?>> b1ResponseTask = Tasks.callable("", new
Callable<Task<Response<...

Async Rest.li requests – using
ParSeq
Task<Response<?>> c1ResponseTask = Tasks.callable("", new
Callable<Task<Response<...

Async Rest.li requests – using
ParSeq
_engine.run(
Tasks.seq(
Tasks.par(a1ResponseTask, a2ResponseTask, a3ResponseTask...

Conclusion
• Rest.li is async and non-blocking under the hood
• You can use Callbacks and ParSeq Tasks and Promises to
...

Links and references
• Rest.li user guide https://github.com/linkedin/rest.li/wiki/Rest.li-
User-Guide
• Asynchronous s...

Me.
https://www.linkedin.com/in/parikhkaran
https://github.com/karanparikh
http://karanparikh.com/
42

Thanks!
43

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