gary sobers

8/9/2019 Gary Sobers

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Everything You Wanted to Kn

About Writing Async,Concurrent HTTP Apps i

Java


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Season o !ists and !e""ow ruitu"


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Close bosom-friend of the maturing sun


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Conspiring with him how to load and ble


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With fruit the vines that round the thatch-evrun;


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To bend with app"es the !oss#d cottage


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And ll all fruit with ripeness to the cor


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To swe"" the gourd, and p"u!p the ha%e


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With a sweet &erne"' to set budding !o


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And sti"" !ore, "ater (owers or the bee


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)nti" they thin& war! days wi"" never c


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For Summer has o'er-brimm'd their clamm


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Who hath not seen thee ot a!id thy st


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So!eti!es whoever see&s abroad !ay


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Thee sitting care"ess on a granary


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Thy hair sot$"ited by the winnowing wi


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r on a ha"$reap-d urrow sound as"eep


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Spares the ne/t swath and a"" its twin0d (


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And so!eti!es "i&e a g"eaner thou dos


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Steady thy "aden head across a br

! b d ith ti t l #


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!r by a cyder-press" with patient loo#


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Thou watchest the "ast oo%ings, hours by hours


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Where are the songs o Spring* Ay, where are they


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Thin& not o the!, thou hast thy !usic


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Whi"e barr0d c"ouds b"oo! the sot$dyi

A d t h th t bb" " i ith


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And touch the stubb"e$p"ains with rosy


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$ohn %ea


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4&o Autumn4 is a poe!by Eng"ish 5o!anticJohn Keats678 ctober 89:; < =7 >ebruary 8
http://en.wikipedia.org/wiki/Poetryhttp://en.wikipedia.org/wiki/Romanticismhttp://en.wikipedia.org/wiki/John_Keatshttp://en.wikipedia.org/wiki/John_Keatshttp://en.wikipedia.org/wiki/Romanticismhttp://en.wikipedia.org/wiki/Poetry


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4To Autu!n4 is the +na" wor& in a go poe!s &nown as Keats#s 48?8: o
http://en.wikipedia.org/wiki/John_Keats's_1819_odeshttp://en.wikipedia.org/wiki/John_Keats's_1819_odes


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4To Autu!n4 is a poe! o three stan%as, each o e"even "ines2 W8?8:, the structure is that o an oda"hy!n, having three c"earsections corresponding to the C"assica" divisions o strophe, anand epode
http://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Strophehttp://en.wikipedia.org/wiki/Antistrophehttp://en.wikipedia.org/wiki/Epodehttp://en.wikipedia.org/wiki/Epodehttp://en.wikipedia.org/wiki/Antistrophehttp://en.wikipedia.org/wiki/Strophehttp://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Ode#English_ode


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The i!agery is rich"yachieved through thepersoni+cationo Autu
http://en.wikipedia.org/wiki/Personificationhttp://en.wikipedia.org/wiki/Personification


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oem


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Season o !ists and !e""ow ruitu"


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Close bosom-friend of the maturing sun


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Conspiring with him how to load and ble

With fruit the vines that round the thatch eves


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With fruit the vines that round the thatch-eves


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To bend with app"es the !oss#d cottage

A d ll ll f it ith i t th


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And ll all fruit with ripeness to the cor

o swe e gour an


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o swe e gour , anp"u!p the ha%e" she"


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With a sweet &erne"' to set budding !o

d i"" " ( h b


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And sti"" !ore, "ater (owers or the bee


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Wh h th t th t id th t


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Thee sitting care"ess on


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Thee sitting care"ess on granary (oor,

Thy hair sot "ited by the winnowing wi


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Thy hair sot$"ited by the winnowing wi

r on a ha" reap-d urrow sound as"eep


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r on a ha"$reap d urrow sound as"eep

.rowsed with the u!e o poppies whi"e thy hoo&


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.rowsed with the u!e o poppies, whi"e thy hoo&

Agenda


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Agenda

ost"y this1

Agenda


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Agenda

And this1

Agenda


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Agenda

And this1

About your spea&er


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About your spea&erBCbar

uchgithub2co!DCbaruch

"in&d2inDbaruch

tac&over(ow2co!DusersDF=F;7Dba

What >rog*


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What >rog*

What >rog*


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What >rog*

What >rog*


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What >rog*

What >rog*


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What >rog*


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CONCURRENT DOWNLOADS


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CONCURRENT DOWNLOADS

Y U NO SUPPORT THEM?!


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>irst Association or concurrent down


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uc&y day1 .own"oad !anager written i


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y y g


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ONE DOES NOT SIMPLY

EMBED JDM

et-s "oo& i we can use


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et s "oo& i we can use

82Lo traceab"e "icense=2Lo website or docs

72Lo traceab"e sources

2Mt-s an app, not a "ib


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IF YOU WANT CONCURRENT DOWN

WRITE IT YOURSELF

WHY WONT YOU JUST


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WHY WON T YOU JUST

USE URLCONNECTION?

Java2net2ur"connectio


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J

82 e!ory wasteu" 6buNering

=2 ini!a" APM

72 O"oc&ing strea!s


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What we-re "oo&ing o


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g

82 AsyncDnon$b"oc&ing

=2 Event ca""bac&s

What is MT going to ta&


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g g

82 5eactor

=2 nio


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< pattern or "ightweight concu


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< Event driven


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g p

http1DDwww2dre2vanderbi"t2eduDsch!idtDP.>Dreactor$

i d

Quess the author by the diagr


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htt DD d D


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In Java, Reactor

means NIO

Se"ector as a !u"tip"e/


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Java version $ 5egister


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SocketChannel channel= SocketChannel.open

socketChannel.connect(new

InetSocketAddress("http://remote.com"

...

Selector selector = Selector.open();

channel.configureBlocking(false);SelectionKey k= channel.register(selecto

SelectionKey.OP_READ);

k.attach(handler);

Java version $ .ispatch


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while (!Thread.interrupted()) {

selector.select();

Set selected = selector.selectedKeys();

Iterator it = selected.iterator();

while (it.hasNext())

SelectionKey k= (SelectionKey)(it.ne ((Runnable)(k.attachment())).run();

selected.clear();

}


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HTTP NIO FRAMWORKS


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DO THE HEAVY LIFTING

Lio "ibraries


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< ost o the! are servers

< Letty, gri%%"y, etc2

< Apache ina

< Apache HTTP co!ponentsasyncc"ient

< Ling http c"ient


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< C"ient and server nio "ibrary< Evo"ved ro! netty

< atest re"ease ctober =F8=


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Lio "ibraries


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< ost o the! are servers

< Letty, gri%%"y, etc

< Apache ina

< Apache HTTP co!ponentsasyncc"ient

< Ling http c"ient


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Ling-s async http c"ie


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Here it is


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try 6AsyncHttpC"ient asyncHttpC"ient R new AsyncHttpC"ient6@@ istenab"e>uture5esponseU uture R asyncHttpC"ient2prepare (http)**oss+frogorg*api*system*ping(@2e/ecute6

A C " ti H d" 5 6@


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new AsyncCo!p"etionHand"er5esponseU6@ Bverride public 5esponse onCo!p"eted65esponse response@

Syste!2out2print"n6response2get5esponseOody6@@' return response' V

Bverride public void onThrowab"e6Throwab"e t@

t2printStac&Trace6@' V V@' 5esponse response R uture2get6@'V


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try (CloseableHttpAsyncClient asyncHttpClient = HttpAsyncClients.createDefau

asyncHttpClient.start();Future future = asyncHttpClient.execute(

HttpAsyncMethods.

createet("http://oss.jfrog.org/api/system/pingnew AsyncByteConsumer() {


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"#$errideprotected void onResponseRecei$ed(final HttpResponse respons

%yste&.out.println(response.'et%tatusine().'etReasonhr

*

"#$errideprotected voidonByteReceived(final Char+u,,er bu,! final -#

"#$errideprotected void releaseResources() { *

"#$errideprotected HttpResponse buildResult(final HttpContext context

return (HttpResponse) context.'etAttribute("http.respons*

*! null);HttpResponse response = future.get();

*


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Choosing between ning and http asyn


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4A"" prob"e!s in co!puter scienc


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p pcan be so"ved by another "eve" o

indirection4.avidWhee"er

pulic interface " ttp#rovider$ ow nload" andler{


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p p {

void onResponseRecei$ed(int statusCode! M ap< %trin'! ist< %trin'

oolean on+ytesRecei$ed(+yte+u,,er bu,);

void onFailed(/hro0 able error);

void onCanceled();

void onCo& pleted();*

Head to head


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Feature*,ibrary ing client .ttp Async Cl

/aturity Qood ery new 6ear"y0ownloadcancelation

Easy With bugs

rogress hoo#s Events notgranu"ar enough

Just use on+yteR

0ocumentation A bit sparse ini!a"

Server-sidecounterpart

Lone, c"ient on"y org2apache2httshttpcore$nio

Peror!ance*


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S!a"" +"e ediu! +"e arge +"eF

8FF=FF

7FF

FF

;FF

XFF

9FF?FF

:FF

http1DDb"ogs2at"assian2co!D=F87DF9Dhtt


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5c=X8X1 a universe o


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Conused*


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Just read so!e stac&over(ow6and i!prove your rep as you go@


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And that odiscoverinrange heal


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lost on re

HTTP WAR STORIES

uestion


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What shou"dcontent$"engwhen using

co!pression


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https1DDgithub2co!Dhttp=Dhttp=$specDissuesDX

uestion


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Why when redirected to C.Lthe chun&s start ro! %ero*

HttpAsyncClient+uilder builder = HttpAsyncClients.custo& ();11 add redirect strate'y that copies 2ran'e2 headers! i, existuilder.setRedirect%trategy(ne0 $ efaultRedirect%trategy(){


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uilder.setRedirect%trategy(ne0 $ efaultRedirect%trategy(){" #$erridepublic Http3riRe4uest 'etRedirect(HttpRe4uest re4uest! HttpResponse res

HttpContext context)Http3riRe4uest redirectRe4uest = super.'etRedirect(re4uest! response! co11 copy 2Ran'e2 headers! i, existHeader56 ran'eHeaders = re4uest.'etHeaders(HttpH eaders.RA78);

i, (ran'eHeaders 9= null) {,or (Header header : ran'eH eaders) {

redirectRe&uest.add" eader(header);

**return redirectRe4uest;

**);

uestion

i "


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How !any si!u"taneouconnections shou"d Mopen*

HTTP 1.1 GOES LIKE:


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CAN YOU PLEASE LIMIT

TO CONNECTIONS?


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BROWSERS GO LIKE:


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URL ENCODING?


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uestion

What-s


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What s

wrong withe o""ow

code*


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public static String

encode)r"6String ur"Str@ )5Encoder2encode6ur"Str, (1&2(@'

222V

.ecoded )5s cannot bere$encoded to the sa!e or!


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http:11exa& ple.co& 14uery= ab= = c

Cannot be decoded bac a,ter it 0 as e

http:11exa& ple.co& 14uery= a ?@b= =

.on-t useava2net2)5Encoder)ti"it " HT di
http://example.com/?query=a&b==chttp://example.com/?query=a&b==chttp://example.com/?query=a&b==chttp://example.com/?query=a&b==chttp://example.com/?query=a&b==chttp://example.com/?query=a&b==c


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)ti"ity c"ass or HT or! encoding2

c"ass contains static !ethods orconverting a String to the applicatiowww-form-urlencoded ME or!at2

>or !ore inor!ation about HT or!

encoding, consu"t the HT speci+cat

AHC A"ternatives


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or'.apache.http.client.utils.3R-+uilder

or'.apache.http.client.utils.3R8ncoded3til


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< Write to separate +"es, co!b+nish


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< Write to sa!e +"e, see&ing t

right position

WHY WONT YOU JUST US


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JAVA.IO.RANDOMACCESSFILE

eve" >i"e oc&ingWHY DO YOU NEED LOCKS


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IF YOU WRITE TO

DIFFERENT PARTS OF FILE?

eve" >i"e oc&ing< Prevent sa!e threads writing t


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Prevent sa!e threads writing t

+"e when we started c"osing it< C"osing seGuence1

< 5e"ease +"e "oc&s

< C"ose channe"s< 5ena!e a +"e to it#s +na" na!e 6re!o

< Erase progress ino


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What-s ne/t*


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httpD=< ost"y standardi%ing Qoog"e#s spd


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y g g p

< Header co!pression< !u"tip"e/ing

< Prioriti%ation

< Server push< n the way c"ear so!e stuN

< E2g2 co!pressed content "ength

How is this useu" to !


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i&e r2 organ said, the abi"ity to !a&e st"ogica" argu!ents wi"" beco!e !ore and !i!portant "ater on in high schoo" and co""e

Pathos and ethos are sti"" va"uab"e Out you

audience wi"" be a "ot better at Guestioningogos is handy because, i you use it we"", rea""y be disproved2

How is this useu" to !Out even better is the superpower to spot weak "


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Out even better is the superpower to spot weak"

Le/t ti!e you watch T or go on"ine 6with your pper!ission, o course@, try to &eep trac& o how !diNerent argu!ents are being pitched to you by !uch ino is given to you* How !uch is "et out*

What ti!e is it*Adven$ wait no Activity ti!e


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Adven$ wait, no2 Activity ti!e

Pair oN into groups o our2 Each group wi"" receive ano a poor argu!ent 6these !ay be either inductive or

With your group, you wi"" have ; !inutes to try to co!one countere3ample$ one way in which the argu!cou"d be wrong, even i the pre!ises are de+nite"y tr

Po&e it u"" o ho"esA"so, choose a group representative to te"" us your re

6Mt#s K to i!agine un"i&e"y or weird e/p"anations'don#t be araid to thin& outside the bo/2

So!e e/a!p"es1ARGUMENT: M pu""ed an a""$nighter studying or "ast we


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ARGUMENT: M pu""ed an a""$nighter studying or "ast wetest, and M ended up with an A2 Tiredness !ust !a&e !

COUNTER:What i you got an A because you actua""y sr !aybe the test was going to be easy or you a"" a"on

ARGUMENT:M M p"ay with .ad#s power too"s, he#"" ye""

Out .ad isye""ing at !e or so!ething2 So M guess M !p"ayed with the power too"s2I

COUNTER:What i he#s ye""ing at you or a diNerent rescratching the car, or ha!!er$throwing the cat onto t


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$ohn %ea


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4&o Autumn4 is a poe!by Eng"ish 5o!anticJohn Keats678 ctober 89:; < =7 >ebruary 8
http://en.wikipedia.org/wiki/Poetryhttp://en.wikipedia.org/wiki/Romanticismhttp://en.wikipedia.org/wiki/John_Keatshttp://en.wikipedia.org/wiki/John_Keatshttp://en.wikipedia.org/wiki/Romanticismhttp://en.wikipedia.org/wiki/Poetry


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4To Autu!n4 is the +na" wor& in a gro poe!s &nown as Keats#s 48?8: o

4To Autu!n4 is a poe! o three stan%as each o e"even "ines W
http://en.wikipedia.org/wiki/John_Keats's_1819_odeshttp://en.wikipedia.org/wiki/John_Keats's_1819_odes


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To Autu!n is a poe! o three stan%as, each o e"even "ines2 W8?8:, the structure is that o an oda"hy!n, having three c"earsections corresponding to the C"assica" divisions o strophe, anand epode

Th i i i h" hi d
http://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Strophehttp://en.wikipedia.org/wiki/Antistrophehttp://en.wikipedia.org/wiki/Epodehttp://en.wikipedia.org/wiki/Epodehttp://en.wikipedia.org/wiki/Antistrophehttp://en.wikipedia.org/wiki/Strophehttp://en.wikipedia.org/wiki/Ode#English_odehttp://en.wikipedia.org/wiki/Ode#English_ode


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The i!agery is rich"y achievedthrough the personi+cationo Au
http://en.wikipedia.org/wiki/Personificationhttp://en.wikipedia.org/wiki/Personification


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oem


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Close bosom-friend of the maturing su

Conspiring with him how to load and


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To bend with app"es the !oss#d cottage$tre


145/174

And ll all fruit with ripeness to the

core;


146/174

To swe"" the gourd, and p"u!p the ha%e"


147/174

With a sweet &erne"' to set budding


148/174

And sti"" !ore, "ater (owers or the


149/174

)nti" they thin& war! days wi"" never cea


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For Summer has o'er-brimm'd their clamm


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So!eti!es whoever see&s abroad +nd


153/174

Thee sitting care"ess on a granary


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Thy hair sot$"ited by the winnowin


155/174

r on a ha"$reap-d urrow sound as


156/174

.rowsed with the u!e o poppies, whi"e thy h


157/174

Spares the ne/t swath and a"" its twin0d(owers1


158/174

And so!eti!es "i&e a g"eaner thou dost


159/174

Steady thy "aden head across a br


160/174

!r by a cyder-press" with patient


161/174

Thou watchest the "ast oo%ings, hours by


162/174

Where are the songs o Spring* Ay, where are


163/174

Thin& not o the!, thou hast thy !usic t


164/174

Whi"e barr0d c"ouds b"oo! the sot$dying


165/174

And touch the stubb"e$p"ains with rosy


166/174

Then in a wai"u" choir the s!a"" gnats !


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r sin#ing as the light wind live

ies;sin&ing


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And u""$grown "a!bs "oud b"eat ro! hi""y b


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edge$cric&ets sing' and now with treb


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The redbreast whist"es ro! a garde


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And gathering swa""ows twitter in th


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gary sobers

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