@jaisonerick@jonatasdp

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Concurrency

Concurrency

Case 1:

Migrating DATA

Migrating DATA

Case da BONUZ (@jaisonerick)

Migrating DATA

Case da Resultados Digitais(@jonatasdp)

Case 2:

BONUZ

WEB APPLICATIONS

Pessimistic Optimistic

MODE● SHARED● EXCLUSIVE

Exclusive Pessimistic Lock

SELECT * FROM `accounts` where `id`=1 FOR UPDATE;

Shared Pessimistic Lock

SELECT * FROM `accounts`where `id`=1 LOCK IN SHARE MODE;

Item Model:

Item Controller:

Threads● MUTEX● DEAD LOCK

Encapsulated

Always lock in the same order!

● Don't do it, if you can avoid it.

● If you must do it, don't share data across

threads.

● If you must share data across threads, don't share

mutable data.

● If you must share mutable data across threads,

synchronize access to that data.

JRUBY - Concurrency Rules:

Testing Concurrency...with concurrency

Hands On!

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