ScalaCacheChris Birchall#m3dev Tech Talk2014/04/23

ScalaCache

Simple facade for popular cache systems● Google Guava● Ehcache● Memcached● Redis● … easy to add your own

Example

Full source herehttps://gist.github.com/cb372/11200131

The Java way:

● Unavoidable repetition● Weak against refactoring

KILLER FEATURE! Method memoization

public int foo(int a, int b, String c) { String key = toKey(“foo”, a, b, c); return withCache(key, () -> { // … do stuff … return x; });}

The Spring way:

● AOP, Proxy objects = runtime magic● Some restrictions, e.g. cannot call method

from the same class

KILLER FEATURE! Method memoization

@Cacheable(“cacheName”)public int foo(int a, int b, String c) { // … do stuff ... return x;}

The ScalaCache way:

● Macros = compile-time magic!● Auto-generates cache key, e.g. “com.

bar.Baz.foo(123, 456, xyz)”

KILLER FEATURE! Method memoization

def foo(a: Int, b: Int, c: String): Int = memoize { // … do stuff … x}

Aside: Quasiquotes

Macros got a lot easier to write in 2.11e.g.

Before

After

Roadmap

Investigating new features for ScalaCache● Async support● Versioning, a.k.a. key-based expiration● Customizable serialization● API improvements● Integration with browser caching à la Play

Cache

Try it!scalaVersion := 2.11.0

resolvers += “Sonatype snapshots” at

“https://oss.sonatype.org/content/repositories/snapshots/”

libraryDependencies +=

“com.github.cb372” %% “scalacache” % “0.3.0-SNAPSHOT”

More info at https://github.com/cb372/scalacache