no mercy ful

8/9/2019 No Mercy Ful

http://slidepdf.com/reader/full/no-mercy-ful 1/324



Close bosom-friend of the maturing

sun;



With fruit the vines that round the thatch-evesrun;



To bend with apples the moss'd cottage-trees ,



And fill all fruit with ripeness to thecore;



To swell the gourd, and plump the hazelshells



For Summer has o'er-brimm'd their clammycells.



Who hath not seen thee oft amid thstore "



Sometimes whoe!er seeks abroad mafind



Thee sitting careless on a granarfloor,



Th hair soft-lifted b the winnowingwind



#r on a half-reap$d furrow soundasleep,



%rowsed with the fume of poppies, while th hook



Spares the ne&t swath and all its twin dflowers(



And sometimes like a gleaner thou dost keep



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



Thou watchest the last oozings, hours bhours)



Where are the songs of Spring" A , where arethe "



Think not of them, thou hast th music too,*



Among the river-sallows! borne



Among the river-sallows! bornealoft

i "i h li h i d li



r sin"ing as the light wind lives ories;

sinking



And full-grown lambs loud bleat from hill bourn;



+edge-crickets sing; and now with treble soft

The redbreast whistles from a garden-



The redbreast whistles from a gardencroft;

n ga er ng swa ows w er n e



g gskies)



!er thing ou Wanted to .now

About Writing Async,Concurrent HTTP Apps

in Java



Agenda

/ostl this(



Agenda

And this(



About our speaker

@ j b a r uc h

g i t h u b .c o m / j b a r u c h

lin !.in/jbaruch

stac over"o#.com/users/$%&%'(



What 0rog"



)e*uirements

+ parallel le -o#nloa!s+ Parallel le parts+ interrupt/pause/resume+ Progress events+ Chec sums caching



0irst Association for 1concurrent

downloader2



3 k d ( % l d



3uck da ( %ownload managerwritten in 4a!a5



et s loo i0 #e can use it1



et s loo i0 #e can use it1

2. 3o traceable license

&.3o #ebsite or !ocs(. 3o traceable sources

$. 4t s an app, not a lib



Java.net.urlconnection

2. 5emory #aste0ul 6bu7ering8&. 5inimal AP4

(. 9loc ing streams



What #e re loo ing 0or

2. Async/non:bloc ing&. ;vent callbac s



What is 4T going to ta e

2. )eactor&. nio



+ pattern 0or light#eight



concurrency

+ ;vent !riven

+ Threa!s reuse

+ <ses non:bloc ing 4o



#riginal pattern

http(66www)dre)!anderbilt)edu67schmidt68%06reactor-siemens)pdf



9uess the author b the diagram

http(66gee)cs)oswego)edu6dl6cp4slide



In Java,Reactor meansNIO

l l l



Selector as a multiple&er

! ! i i i



:a!a !ersion - egisteringSocketChannel channel= SocketChannel.open();

socketChannel.connect(new

InetSocketAddress("http://remote.com",80));

...

Selector selector = Selector.open();

channel.configureBlocking(false);

SelectionKey k = channel.register(selector,SelectionKey.OP_READ);

k.attach(handler);

! ! i %i h



:a!a !ersion - %ispatcher while (!Thread.interrupted()) {

selector.select() ;

Set selected = selector.selectedKeys();

Iterator it = selected.iterator();while (it.hasNext())

SelectionKey k = (SelectionKey)(it.next();

( (Runnable)(k.attachment()) ).run(); selected.clear();

}

Han!ling reactor events is



Han!ling reactor events iscomple=

+3ee! to maintain state

+9u7ering + assemblingchun s

+Coor!inating async events



3i lib i



3io libraries

+5ost o0 them are servers+3etty, gri>>ly, etc.

+Apache 5ina+Apache HTTP components

asyncclient+3ing http client



+Client an! server nio library

+;volve! 0rom netty+ atest release ?ctober &%2&



+ere it is5



+ere it is5

try 6AsyncHttpClient asyncHttpClient new AsyncHttpClient688 istenableButure )esponseD 0uture asyncHttpClient.prepareEet6



y p p p "http://oss.jfrog.org/api/system/ping" 8.e=ecute6

new AsyncCompletionHan!ler )esponseD68 @?verri!e public )esponse onComplete!6)esponse response8 Fystem. out .println6response.get)esponse9o!y688 G return response G

@?verri!e public void onThro#able6Thro#able t8 t.printFtac Trace68 G

8 G )esponse response 0uture.get68 G



HAC Concepts



HAC Concepts

+)e*uest pro!ucer+)esponse consumer

try (CloseableHttpAsyncClient asyncHttpClient = HttpAsyncClients.createDefault

()) {asyncHttpClient.start();Future<HttpResponse> future = asyncHttpClient.execute(

HttpAsyncMethods.create et( "http://oss.jfrog.org/api/system/ping" )!newAsyncByteConsumer<HttpResponse>() {



new AsyncByteConsumer<HttpResponse>() {

"#$errideprotected void onResponseRecei$ed(final HttpResponse response) {%yste&.out .println(response.'et%tatus ine().'etReason hrase());

*

"#$erride

protected void onByteReceived(final Char+u,,er bu,! final -#Control ioctrl) { *"#$errideprotected void releaseResources() { *

"#$erride

protected HttpResponse buildResult( final HttpContext context) {return (HttpResponse) context.'etAttribute( "http.response" );*

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

*



=hoosing between ning and httpli t



as ncclient



pu lic interface "ttp#rovider$ownload"andler {

void onResponseRecei$ed( int statusCode! Map<%trin'!ist<%trin'>> headers);

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

void onFailed(/hro0able error); void onCanceled();

void onCo&pleted();*

+ead to head



Feature#$ibrary %ing client &ttp Async Clientaturity 9ood >er new ?earl @ BCD(ownload

cancelation

as With bugs

)rogresshoo"s

!ents notgranularenough

:ust useon9yte)eceive!68

(ocumentation A bit sparse /inimalServer-sidecounterpart

<one, clientonl

org)apache)httpcomponents



fc@GBG( a uni!erse of its own



@ (



=onfused"



And that onefordiscoveringthat range



that range

header is loston redirect

Huestion5



What should

be content-length when

usingcompression"



https(66github)com6http@6http@-spec6issues6CG

Huestion5



Wh when redirected to =%<all the chunks start from zero"

HttpAsyncClient+uilder builder = HttpAsyncClients.custo&();11 add redirect strate'y that copies 2ran'e2 headers! i, exist

ild tR di t%t t ( 0 $ f ltR di t%t t () {



uilder.setRedirect%trategy (ne0 $efaultRedirect%trategy() {

"#$erridepublic Http3riRe4uest 'etRedirect(HttpRe4uest re4uest! HttpResponseresponse! HttpContext context)

Http3riRe4uest redirectRe4uest = super.'etRedirect(re4uest!response! context);

11 copy 2Ran'e2 headers! i, existHeader56 ran'eHeaders = re4uest.'etHeaders(HttpHeaders.RA7 8);

i, (ran'eHeaders 9= null) {,or (Header header : ran'eHeaders) {redirectRe&uest.add"eader(header) ;

**return redirectRe4uest;

**);

Huestion5



+ow man simultaneousconnections should Iopen"



Huestion5



What$swrong withthefollowingcode"



%ecoded U 3s cannot bere-encoded to the same form



http:11exa&ple.co&1 4uery=a b==c

Cannot be decoded bac a,ter it0as encoded:

http:11exa&ple.co&1 4uery=a ?@b==c

%on$t use 4a!a)net)U 3 ncoder

http://example.com/?query=a&b==c








1Utilit class for +T/3 formencoding) This class containsstatic methods for con!erting a

String to the application/x-www-form-urlencoded /I/format)

0or more information about +T/3form encoding, consult the +T/3specification)2

A+= Alternati!es



Huestion5



+ow do Iclose asocketcorrectl "

+ow hard can it be to close a socket"



The art of socket closing



http(66www)safaribooksonline)com6librar 6!iew6http-the-

+alf-closed( no new customers



<e!er block in socket close?D



The other side e&pectsou to clean up nicel

It will gi!e up on time out

ou will wait ?fore!erD



emember"



Huestion5



+ow can Iwrite file parts

concurrentl "

+ Write to separate les,combine on nish



+ Write to same le, see ing tothe right position



#S 3e!el 0ile 3ocking N Ad!isor e&clusi!e



private File oc loc (FileChannel ,ileChannel) throws-#8xception { File oc loc =,ileChannel.try oc ( on'. MAX_VALUE B! B! false ); if (loc == null ) { throw new #$erlappin'File oc 8xception(); * return loc ;*

WT0"5

>/ 3e!el 0ile 3ocking



5 evel Bile oc ing



+Prevent same 5 threa!s #riting tothe le #hen #e starte! closing it+Closing se*uenceK

+)elease le loc s+Close channels

+)ename a le to itLs nal name6remove .part8+;rase progress in0o

>/ 3e!el 0ile 3ockingReentrantRead rite oc .Read oc write'o ile oc* =



r0l.read oc ();ReentrantRead rite oc . rite oc close ile oc* =r0l.0rite oc ();

public $oid close() thro0s -#8xception { this. close ile oc*.loc* ();*

public int 0rite(int part-ndex! +yte+u,,er bu,) { i, (9this. write'o ile oc*.try oc* ()) {

thro0 ne0 -lle'al%tate8xception(2File isbein' closed2); * ...*

What$s ne&t"



http/&



+ 5ostly stan!ar!i>ing EoogleLssp!y+ Hea!er compression

+ multiple=ing+ Prioriti>ation+ Ferver push+ ?n the #ay clear some stu7 + ;.g. compresse! content length

ase the load



3inks5

T0/( 0 @GBG

http://www.w3.org/Protocols/rfc2616




T0/( 0= @GBGUltimate book( &,,) ,he (efinitive /uide

Amazon

Safari

eactor pattern

%oug 3ea on <I#


http://www.amazon.com/HTTP-The-Definitive-Guide-Guides/dp/1565925092

http://www.safaribooksonline.com/library/view/http-the-definitive/1565925092/

http://jeewanthad.blogspot.co.il/2013/02/reactor-pattern-explained-part-1.html

http://gee.cs.oswego.edu/dl/cpjslides/nio.pdf

http://gee.cs.oswego.edu/dl/cpjslides/nio.pdf

http://jeewanthad.blogspot.co.il/2013/02/reactor-pattern-explained-part-1.html

http://www.safaribooksonline.com/library/view/http-the-definitive/1565925092/

http://www.amazon.com/HTTP-The-Definitive-Guide-Guides/dp/1565925092




Fo #hat e=actly is logicN WhocaresN4n0ormally logic is about saying things that make



4n0ormally, logic is about saying things that makesense. Oou can thin o0 it in that #ay i0 you li e.

4tLs pretty sunny to!ay, so you shoul! #ear sunscreen.Q

Bormally, logic is the art o0 arguing + not li e a ghtor !ebate, but by using the in0ormation #e alrea!yno# to !ra# ne# an! use0ul conclusions.

40 itLs sunny to!ay, you shoul! #ear sunscreen.4n!ee! it is sunny to!ay.

There0ore, you shoul! #ear sunscreen.Q

9ut #ait. That just loo e! li e the e=actsame thing you sai! be0ore, you hac . Q



Well, yes. 9ut thatLs ho# an argument loo s i0orm1 Oou can brea !o#n any argument intothat ma es it easier to thin about.

40 itLs sunny to!ay, you shoul! #ear sunscree

4t is sunny to!ay.

RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR There0ore, you shoul! #ear sunscreen.

Premises/givens

Conclusion6Premises al#ays come rst, an! the conclusion al#ays c

Ho# about a more comple=argumentN

2 This piece o0 0resh 0ruit is 0u>>y



2. This piece o0 0resh 0ruit is 0u>>y.&. 4t also has see!s.

(. 40 a 0ruit is 0u>>y, itLs either a i#i or a peach.

$. Peaches have a pitG they !onLt have see!s.

'. Fo the 0ruit canLt be a peach.

S. Fo the 0ruit must be a i#i.

Which o0 the above sentences is a conclusionN


2 This piece o0 0resh 0ruit is 0u>>y



2. This piece o0 0resh 0ruit is 0u>>y.&. 4t also has see!s.





Eoo! logic lets us cobble together lots o0 !i7erent pieces o0 in0ormation, an! tell 0romthem #hatLs probably or defnitely true.

9ut #hat counts as goo!logicQN

That argument #as goo! 6ma!e sense8



That argument #as goo! 6ma!e sense8,because the conclusion 0ollo#e! 0rom thepremises. WeLll see #hat this means in amoment.

Why !onLt #e loo at a bad argumentN


Fome people have 0allen o7 cli7s an! live!



Fome people have 0allen o7 cli7s an! live!.There0ore, i0 4 jump o7 this cli7, 4 #ill !e nitely be

Come on.What coul!possibly go#rongNQ


Fome people have 0allen o7 cli7s an! live!



Fome people have 0allen o7 cli7s an! live!.There0ore, i0 4 jump o7 this cli7, 4 #ill !e nitely be

This argument is #ea . Although the premise iitLs easy to thin o0 #ays 6very pain0ul #ays8 tconclusion coul! be 0alse. The easiest #ay tologic is to !o just thatK try to thin o0 another

6Philosophers call these counterexamples 8.


etLs loo at t#o in!s o0 arguments



etLs loo at t#o in!s o0 arguments.1. -e!uctive reasoningK All interns can breathe re. Fo Philip

can breathe re.

4s there a piece o0 the pu>>le missingN





etLs loo at t#o in!s o0 arguments.1. -e!uctive reasoningK All interns can breathe re. Philip is an

intern. Fo Philip can breathe re.

Fometimes you may encounter hi!!enQ statan! i!eas, #hich the #riter snea s in but !oesay outright.





etLs loo at t#o in!s o0 arguments.1. -e!uctive reasoningK

All interns can breathe re. Philip is

an intern. Fo Philip can breathere.

Are the premises trueN40 so, then the concl usionLs100% guaranteed true.3o getting aroun! it1


etLs loo at t#o in!s o0 arguments.



g2. 4n!uctive reasoningK

4 touche! a stove an! it burne! me. 4 !i! this0ty times, an! the same thing happene!. Fo

the ne=t time 4 touch the stove, it #ill burn me.

Are the premises trueN40 so, then the conclusionLs

probably true. There mightstill be e=ceptions. 4 ; WHATN



Ho# is this use0ul to meN

9ut even better is the superpo#er to spotk l i



9ut even better is the superpo#er to spotweak logic.

3e=t time you #atch T or go online 6#ith

your parentsL permission, o0 course8, try toeep trac o0 ho# many !i7erentarguments are being pitche! to you bya!s. Ho# much in0o is given to youN Ho#much is le0t outN

What time is itN

A!ven: #ait, no. Activity time1



, yPair o7 into groups o0 0our. ;ach group #ill receive an eo0 a poor argument 6these may be either in!uctive or !

With your group, you #ill have ' minutes to try to comone counterexample : one #ay in #hich the argumecoul! be #rong, even i0 the premises are !e nitely truePo e it 0ull o0 holes1Also, choose a group representative to tell us your reas

64tLs ? to imagine unli ely or #eir! e=planationsG!onLt be a0rai! to thin outsi!e the bo=.?!!ly enough, logic has very little to !o #ith 0acts.8

Fome e=amplesK

ARGU !"#$ 4 pulle! an all:nighter stu!ying 0or last #ee! 4 ! ! #i h A Ti !



test, an! 4 en!e! up #ith an A. Tire!ness must ma e me

&U"#!R$ What i0 you got an A because you actually st?r maybe the test #as going to be easy 0or you all along

ARGU !"#$ 40 4 play #ith -a!Ls po#er tools, heLll yell at9ut -a! is yelling at me 0or something. Fo 4 guess 4 musplaye! #ith the po#er tools.Q

&U"#!R$ What i0 heLs yelling at you 0or a !i7erent reasscratching the car, or hammer:thro#ing the cat onto the

Season of mists and mellowfruitfulness,



Close bosom-friend of the maturingsun;

Conspiring with him how to load and bless



And fill all fruit with ripeness to thecore;



With a sweet kernel; to set buddingmore,



And still more, later flowers for the bees,



Until the think warm da s will ne!er cease,



Stead th laden head across abrook;



While barr d clouds bloom the soft-d ing da



And touch the stubble-plains with roshue;



r sin"ing as the light wind lives ories;sinking



The redbreast whistles from a garden-croft;



n ga er ng swa ows w er n eskies)



0ohn 1eats

O,o Autumn O is a poem b nglishomantic poet :ohn .eats ?EB

http://en.wikipedia.org/wiki/Poetry

http://en.wikipedia.org/wiki/Romanticism

http://en.wikipedia.org/wiki/John_Keats






p#ctober BFML N @E 0ebruar BP@BD)

OTo AutumnO is the final work in agroup of poems known as





g p p.eats's OBPBM odesO )

OTo AutumnO is a poem of threestanzas, each of ele!en lines) Written

in BPBM, the structure is that of anodal h mn , ha!ing three clearl

http://en.wikipedia.org/wiki/John_Keats's_1819_odes


http://en.wikipedia.org/wiki/Ode




gdefined sections corresponding to the

=lassical di!isions of strophe ,antistrophe , and epode

The imager is richl achie!edthrough the personification of Autumn


http://en.wikipedia.org/wiki/Strophe

http://en.wikipedia.org/wiki/Antistrophe

http://en.wikipedia.org/wiki/Epode




http://en.wikipedia.org/wiki/Personification




through the personification of Autumn

)oem





)oem




Until the think warm da s will ne!er cease,



Stead th laden head across a brook;



And touch the stubble-plains with ros hue;



O,o Autumn O is a poem b nglishomantic poet :ohn .eats ?EB#ctober BFML N @E 0ebruar BP@BD)









)oem



To swell the gourd, and plump the

hazel shells



Until the think warm da s will ne!ercease,



Spares the ne&t swath and all itstwin d flowers(



And sometimes like a gleaner thoudost keep



Welcome Qack

Internet marketing, S #, Social <etworksand moreR

9etting the best from the web



%ovember 2334



O,o Autumn O is a poem b nglishomantic poet :ohn .eats ?EB#ctober BFML N @E 0ebruar BP@BD)









OTo AutumnO is the final work in agroup of poems known as.eats's OBPBM odesO )





OTo AutumnO is a poem of threestanzas, each of ele!en lines) Written

in BPBM, the structure is that of anodal h mn , ha!ing three clearldefined sections corresponding to the

=lassical di!isions of strophe ,









antistrophe , and epode

The imager is richl achie!edthrough the personification of Autumn









)oem



Season of mists and mellow fruitfulness,



With fruit the vines that round the thatch-eves

run;



And fill all fruit with ripeness to the

core;




hazel shells



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

cells.



Spares the ne&t swath and all itstwin d flowers(



And sometimes like a gleaner thoudost keep



Stead th laden head across abrook;



Thou watchest the last oozings,

hours b hours)



Think not of them, thou hast thmusic too,*



0ohn 1eats




With fruit the vines that round the thatch-eves run;



To bend with apples the moss'd cottage-

trees ,



And fill all fruit with ripeness to the

core;




hazel shells



With a sweet kernel; to set budding

more,



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

cells.



Who hath not seen thee oft amid th

store "



Sometimes whoe!er seeks abroad ma

find



Th hair soft-lifted b the winnowing

wind



#r on a half-reap$d furrow sound

asleep,



Spares the ne&t swath and all its

twin d flowers(



And sometimes like a gleaner thou

dost keep



Stead th laden head across a

brook;



Thou watchest the last oozings,

hours b hours)



Think not of them, thou hast th

music too,*



While barr d clouds bloom the soft-

d ing da



gnats mourn




aloft



r sin"ing as the light wind lives or

ies;sinking



And full-grown lambs loud bleat from hill

bourn;



gnats mourn




aloft



A Muic

Touro0 Logos

The ogical Appea



Fo #hat e=actly is logicN WhocaresN4n0ormally, logic is about saying things that makesense. Oou can thin o0 it in that #ay i0 you li e.

4tLs pretty sunny to!ay, so you shoul! #ear sunscreen.Q

Bormally, logic is the art o0 arguing + not li e a ghtor !ebate, but by using the in0ormation #e alrea!yno# to !ra# ne# an! use0ul conclusions.

40 itLs sunny to!ay you shoul! #ear sunscreen



40 itLs sunny to!ay, you shoul! #ear sunscreen.4n!ee! it is sunny to!ay.

There0ore, you shoul! #ear sunscreen.Q

9ut #ait. That just loo e! li e the e=actsame thing you sai! be0ore, you hac . Q

Well, yes. 9ut thatLs ho# an argument loo s i0orm1 Oou can brea !o#n any argument intothat ma es it easier to thin about.

40 itLs sunny to!ay, you shoul! #ear sunscree4t is sunny to!ay.

RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR

Premises/givens



There0ore, you shoul! #ear sunscreen.Conclusion

6Premises al#ays come rst, an! the co


2. This piece o0 0resh 0ruit is 0u>>y.

&. 4t also has see!s.





Which o0 the abo e sentences is a concl sionN



Which o0 the above sentences is a conclusionN


2. This piece o0 0resh 0ruit is 0u>>y.

&. 4t also has see!s.





Eoo! logic lets us cobble together lots o0



g g!i7erent pieces o0 in0ormation, an! tell 0rom

them #hatLs probably or defnitely true.


That argument #as goo! 6ma!e sense8, because theconclusion 0ollo#e! 0rom the premises. WeLll see

#hat this means in a moment.

Why !onLt #e loo at a bad argumentN



r sin"ing as the light wind lives or

ies;sinking



And full-grown lambs loud bleat from hill

bourn;



The redbreast whistles from a garden-croft;



0ohn 1eats

no mercy ful

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