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Writing correct concurrentapplications is too hard
Scaling out applications is
too hard
Writing highly fault-tolerant
applications is too hard
We believe that...
Tuesday, July 20, 2010
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...sometimes
plain evilTuesday, July 20, 2010
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...but always the
wrong defaultTuesday, July 20, 2010
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Threads are to Concurrency asWitchcraft is to Physics
Hanging by a thread is the punishmentfor Shared State Concurrency
- Gilad Bracha
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Actorsone tool in the toolbox
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Implements Message-Passing Concurrency
Share!NOTHING Isolated lightweight processes
Communicates through messages
Asynchronous and non-blocking
Each actor has a mailbox (message queue)
Actor Model of
Concurrency
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Actor Model of
Concurrency Easier to reason about
Raised abstraction level Easier to avoid
Race conditions
Deadlocks
Starvation
Live locks
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Introducing
STM
Persistent
Distributed
RESTful Secure
Agents
Dataflow Open Source
Actors
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ARCHITECTURE
ENTERPRISE
MODULES
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Two different models
Thread-based
Event-based
Very!lightweight (600 bytes per actor) Can easily create!millions!on a single
workstation (6.5 million on 4 G RAM)
Does not consume a thread
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!"#$%&'($!)!"#$%
!*"##!&'()*+,!$+)$,-#!-$*',!.
!!./01")$!1"/!$'()*+,!/!0
!!-$2!,+$+#1+!/!.
!!!!!"#$!"#$%!/2!
!!!!!!$'()*+,!3/!4!!!!!!5,#)*6)7$'()*+,8
!!9
9
Actors
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03.&/)!-$*',:;
1"*!$'()*+,!/!
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1"*!7,$4!BC-$*',7::88
Create Actors
create actor with constructor arguments
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1"*!$'()*+,!/!
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1"*!$'()*+,!/!
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1"*!$'()*+,!/!
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!*"##%BC-$*',!$+)$,-#!-$*',!.
%%&1$//0-$%-$2!#)#*!/!.
!!!!:::!EE!$
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!*"##!A+$(,D#1+-$*',!$+)$,-#!-$*',!.
!!./01")$!1"/!$'()*+,!/!0
!!D+6>:#F!/!LD+,1#$+M,+$(,D#1+N
!!-$2!,+$+#1+!/!.
!!!!!"#$!"#$%!/2!
!!!!!!$'()*+,!3/!4
!!!!!!D+6>!O!"#$%!!9
9
the selfreference
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1"*%J',%+,!/!)8!/2!>)78
9
Actorsanonymous
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$'()*+,!O!"#$%!
Send: !
fire-forget
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1"*!,+D(6*!/!7
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1"*!,+D(6*=5*#')!/!
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EE!,+*(,)D!(*(,+
1"*!>(*(,+!/!
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!*"##!R'U+-$*',!$+)$,-#!-$*',!.
!!-$2!,+$+#1+!/!.
!!!!!"#$!ZD+,7):,+56C7L[#!N!3!)
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!*"##!R'U+-$*',!$+)$,-#!-$*',!.
!!-$2!,+$+#1+!/!.
!!!!!"#$!ZD+,7):D+)F+,!!9
9
Reply
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!*"##!R'U+-$*',!$+)$,-#!-$*',!.
!!-$2!,+$+#1+!/!.
!!!!!"#$!ZD+,7)
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EE!F+>#)+!*I+!$
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Akka Dispatchers
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&'($!)!\#D5
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1"*!F#D5
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MessageQueues
UnboundedLinkedBlockingQueue
BoundedLinkedBlockingQueueBounded ArrayBlockingQueueBounded SynchronousQueue
Plus different options per queue
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1"*!',+)8-$*',A+Q#D*,C:DI(*F'J)-66
ActorRegistry
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Let it crashfault-tolerance
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Stolen from
Erlang
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9ninesTuesday, July 20, 2010
O F O
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OneForOne
fault handling strategy
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O F O
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OneForOne
fault handling strategy
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O F O
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OneForOne
fault handling strategy
Tuesday, July 20, 2010
O F O
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OneForOne
fault handling strategy
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O F O
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OneForOne
fault handling strategy
Tuesday, July 20, 2010
O F O
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OneForOne
fault handling strategy
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AllF O
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AllForOne
fault handling strategy
Tuesday, July 20, 2010
AllF O
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AllForOne
fault handling strategy
Tuesday, July 20, 2010
AllF O
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AllForOne
fault handling strategy
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S i hi hi
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Supervisor hierarchies
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S i hi hi
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Supervisor hierarchies
Tuesday, July 20, 2010
S i hi hi
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Supervisor hierarchies
Tuesday, July 20, 2010
S i hi hi
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Supervisor hierarchies
Tuesday, July 20, 2010
F l h dl
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-66V',=)+R*,
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6#)%7
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*,
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!*"##!R(5+,1#D',!$+)$,-#!-$*',!.
!!03.&/)!D+6>:;
!!*,
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!*"##!V
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Remote Actors
Tuesday, July 20, 2010
R t S
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EE!(D+!I'D*!i!5',*!#)!$')>#Q
A+U'*+_'F+:D*
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Client-initated and managedServer-initiated and managed
Two types of
remote actors
Tuesday, July 20, 2010
Cli t d
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EE!U+*I'FD!#)!-$*',!$6
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1"*!
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A+U'*+_'F+:,+Q#D*+,7
!!LD+,1#$+M#FNX!
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1"*!I
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STManother tool in the toolbox
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60
What isSTM?
Tuesday, July 20, 2010
STM: overview
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STM: overview See the memory (heap and stack) as atransactional dataset
Similar to a database
begin commit abort/rollback
Transactions are retried automaticallyupon collision
Rolls backthe memory on abort
Tuesday, July 20, 2010
Managed References
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Separates Identity fromValue
-Values are immutable
- Identity (Ref) holdsValues Change is a function
Compare-and-swap (CAS)
Abstraction of time Must be used within a transaction
Managed References
Tuesday, July 20, 2010
Managed References
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1"*!,+>!/!A+>7B:DJ
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1"*!(D+,D!/!",
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03.&/)!",!!9
9
STM:API
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Actors + STM =Transactors
Tuesday, July 20, 2010
Transactors
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!*"##!ZD+,A+Q#D*,C!$+)$,-#!",
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Transactors
Tuesday, July 20, 2010
Transactors
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TransactorsStart transaction
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Transactors
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TransactorsStart transaction
Send message
Tuesday, July 20, 2010
Transactors
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TransactorsStart transaction
Send message
Tuesday, July 20, 2010
Transactors
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TransactorsStart transaction
Send message
Update state
within transaction
Tuesday, July 20, 2010
Transactors
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TransactorsStart transaction
Send message
Update state
within transaction
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Transactors
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TransactorsStart transaction
Send message
Update state
within transaction
Tuesday, July 20, 2010
Transactors
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TransactorsStart transaction
Send message
Update state
within transaction
Tuesday, July 20, 2010
Transactors
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TransactorsStart transaction
Send message
Update state
within transaction
Tuesday, July 20, 2010
Transactors
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TransactorsStart transaction
Send message
Update state
within transaction
Tuesday, July 20, 2010
Transactors
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TransactorsStart transaction
Send message
Update state
within transaction
Transaction
fails
Tuesday, July 20, 2010
Transactors
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TransactorsStart transaction
Send message
Update state
within transaction
Transaction
fails
Tuesday, July 20, 2010
Transactors
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Transactors
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Transactors
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Transactors
Tuesday, July 20, 2010
Transactors
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Transactors
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Transactors
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Transactors
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Transactors
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TransactorsTransaction
automatically
retried
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Agentsyet another tool in the toolbox
Tuesday, July 20, 2010
Agents
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1"*!()$*#')!
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(some of the)Modules
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Akka Spring
Tuesday, July 20, 2010
Spring integration
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lK+
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6
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Akka Camel
Tuesday, July 20, 2010
Camel: consumer
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!*"##!BC&')D(U+,!$+)$,-#!-$*',!40)5!&')D(U+,!.
!!-$2!+)F5'#)*Z,#!/!j>#6+MF
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!*"##!BC&')D(U+,!$+)$,-#!-$*',!40)5!&')D(U+,!.
!!-$2!+)F5'#)*Z,#!/!
!!!!jf+**CMI**5MEE0:0:0:0MccrrE$
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!*"##!&'U+*^,'F($+,!
!!$+)$,-#!-$*',!40)5!^,'F($+,!.
!!
!!-$2!+)F5'#)*Z,#!/!!!!!j$'U+*FMEE6'$
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1"*!5,'F($+,!/!
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Akka Persistence
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Akka Persistence API
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EE!*,!/!B')Q'R*',
Turns the STM into ACID
Tuesday, July 20, 2010
Get data by id
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y
EE!*,!/!B')Q'R*',7((#F8
Tuesday, July 20, 2010
For Redis only (so far)
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For Redis only (so far)
1"*!s(+(+M!^+,D#D*+)*`(+(+?S6+U+)*"C5+@!/!!!
!!A+F#DR*',
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Akka Deployment
Tuesday, July 20, 2010
Deployment
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Deploy as dependency JAR inWEB-INF/lib etc.
Run as microkernelSoon OSGi-enabled, then drop
in any OSGi container (SpringDM server, Karaf etc.)
Deployment
Tuesday, July 20, 2010
and much more
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REST
Comet
Security
...and much more
Web
GuiceJTA
AMQP
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EOFTuesday, July 20, 2010
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