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Guava Overview. Part 2
  Andrei Savu / Bucharest JUG #2
      asavu @ axemblr.com
About me
Founding Partner @ Axemblr.com
Apache Whirr PMC Member
jclouds committer

Connect with me on LinkedIn
@ Axemblr
Building a tool and a platform for managing
Apache Hadoop clusters on cloud infrastructure

Axemblr Tool for Cloudera CDH3
  http://axemblr.com/tool

Axemblr Service for Apache Hadoop
  http://axemblr.com/service
Plan
● What is Guava?
● Caches
● Concurrency Services
Quick Intro
What is Guava?
Open-source version of Google's core Java
libraries

[...] carefully designed, tested, optimized and
used in production at Google

You don't need to write them, test them, or
optimize them: you can just use them.
What is Guava? (cont)
Battle-tested in production at Google

Staggering numbers of unit tests. >110.000 as
of January 2012 (generated)

Lives near the bottom of the stack, right on top
of the JDK itself
Caches
Caches - When to use?
When a value is either

● expensive to compute
● expensive to retrieve

More or less similar to ConcurrentMap +
automatic eviction
Caches - When to use? (cont)
● spend memory to improve speed
● keys are queried multiple times
● your application would work if every value
  was evicted immediately
● you have less data than RAM
Caches - Example #1
Caches - Example #2
Caches - Example #3
cache.put(key, value)

A Cache can be accessed as a Map:

Cache.asMap() returns a ConcurrentMap
Caches - Eviction #1
By size

 CacheBuilder.maximumSize(long)

By custom weight

 CacheBuilder.weigher(Weigher)
 CacheBuilder.maximumWeight(long)
Caches - Eviction #2
By time

  expireAfterAccess(long, TimeUnit)
  expireAfterWrite(long, TimeUnit)
Caches - Eviction #3
Reference-based eviction

  CacheBuilder.weakKeys()
  CacheBuilder.weakValues()
  CacheBuilder.softValues()

Note: all of them are using == for equality and
*not* equals()
Caches - Eviction #4
Explicit

   Cache.invalidate(key)
   Cache.invalidateAll(keys)
   Cache.invalidateAll()
Caches - Removal Listeners
CacheBuilder
  .removalListener(RemovalListener)

Be aware of long running listeners. They are
blocking the queue.

RemovalListeners
  .asynchronous(RemovalListener, Executor)
Caches - Cleanup
Automatic eviction happens on writes
Explicit Cache.cleanup()
(you can put this in a thread)
Caches - Refresh
LoadingCache.refresh(K)

CacheLoader.reload(K, V)
(if the new value can be computed from the old
one)
Cache - Statistics
CacheBuilder.recordStats()

CacheStats Cache.stats()
  hitRate()
  averageLoadPenalty()
  evictionCount()
Service
What is this?
Object with operational state
Start and stop methods

E.g. web servers, RPC servers, timers etc.

Non-trivial if multiple threads are involved.
Lifecycle
●   Service.State.NEW to
●   Service.State.STARTING to
●   Service.State.RUNNING to
●   Service.State.STOPPING to
●   Service.State.TERMINATED

On failure:
● Service.State.FAILED

A stopped service may not be restarted.
Lifecycle #2
asynchronously:
  start - returns ListenableFuture
  stop

synchronously
  startAndWait
  stopAndWait
Implementations
AbstractIdleService
Has nothing to run:
AbstractExecutionThreadService
AbstractScheduledService
Similar to AbstractExecutionThreadService

Override runOneIteration
Implement scheduler()
  newFixedRateSchedule(initialDelay, delay,
TimeUnit)
  newFixedDelaySchedule(initialDelay, delay,
TimeUnit)
Next?
Functional Idioms
Ranges
I/O
Hashing
Math
Reflection
Concurrency (ListenableFuture)
EventBus
See Guava Wiki
Thanks! Questions?
Andrei Savu / asavu @ axemblr.com

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