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/**
* Copyright (C) 2009-2011 Scalable Solutions AB <http://scalablesolutions.se>
*/
package akka.dispatch
import akka.actor.{ Actor, ActorRef }
import akka.actor.newUuid
import akka.config.Config._
import akka.util.{ Duration, ReflectiveAccess }
import akka.config.Configuration
import java.util.concurrent.TimeUnit
/**
* Scala API. Dispatcher factory.
* <p/>
* Example usage:
* <pre/>
* val dispatcher = Dispatchers.newExecutorBasedEventDrivenDispatcher("name")
* dispatcher
* .withNewThreadPoolWithLinkedBlockingQueueWithCapacity(100)
* .setCorePoolSize(16)
* .setMaxPoolSize(128)
* .setKeepAliveTimeInMillis(60000)
* .setRejectionPolicy(new CallerRunsPolicy)
* .build
* </pre>
* <p/>
* Java API. Dispatcher factory.
* <p/>
* Example usage:
* <pre/>
* MessageDispatcher dispatcher = Dispatchers.newExecutorBasedEventDrivenDispatcher("name");
* dispatcher
* .withNewThreadPoolWithLinkedBlockingQueueWithCapacity(100)
* .setCorePoolSize(16)
* .setMaxPoolSize(128)
* .setKeepAliveTimeInMillis(60000)
* .setRejectionPolicy(new CallerRunsPolicy())
* .build();
* </pre>
* <p/>
*
* @author <a href="http://jonasboner.com">Jonas Bonér</a>
*/
object Dispatchers {
val THROUGHPUT = config.getInt("akka.actor.throughput", 5)
val DEFAULT_SHUTDOWN_TIMEOUT = config.getLong("akka.actor.dispatcher-shutdown-timeout").
map(time => Duration(time, TIME_UNIT)).
getOrElse(Duration(1000, TimeUnit.MILLISECONDS))
val MAILBOX_CAPACITY = config.getInt("akka.actor.default-dispatcher.mailbox-capacity", -1)
val MAILBOX_PUSH_TIME_OUT = Duration(config.getInt("akka.actor.default-dispatcher.mailbox-push-timeout-time", 10), TIME_UNIT)
val THROUGHPUT_DEADLINE_TIME = Duration(config.getInt("akka.actor.throughput-deadline-time", -1), TIME_UNIT)
val THROUGHPUT_DEADLINE_TIME_MILLIS = THROUGHPUT_DEADLINE_TIME.toMillis.toInt
val MAILBOX_TYPE: MailboxType = if (MAILBOX_CAPACITY < 1) UnboundedMailbox() else BoundedMailbox()
lazy val defaultGlobalDispatcher = {
config.getSection("akka.actor.default-dispatcher").flatMap(from).getOrElse(globalExecutorBasedEventDrivenDispatcher)
}
object globalExecutorBasedEventDrivenDispatcher extends ExecutorBasedEventDrivenDispatcher("global", THROUGHPUT, THROUGHPUT_DEADLINE_TIME_MILLIS, MAILBOX_TYPE)
/**
* Creates an thread based dispatcher serving a single actor through the same single thread.
* Uses the default timeout
* <p/>
* E.g. each actor consumes its own thread.
*/
def newThreadBasedDispatcher(actor: ActorRef) = new ThreadBasedDispatcher(actor)
/**
* Creates an thread based dispatcher serving a single actor through the same single thread.
* Uses the default timeout
* If capacity is negative, it's Integer.MAX_VALUE
* <p/>
* E.g. each actor consumes its own thread.
*/
def newThreadBasedDispatcher(actor: ActorRef, mailboxCapacity: Int) = new ThreadBasedDispatcher(actor, mailboxCapacity)
/**
* Creates an thread based dispatcher serving a single actor through the same single thread.
* If capacity is negative, it's Integer.MAX_VALUE
* <p/>
* E.g. each actor consumes its own thread.
*/
def newThreadBasedDispatcher(actor: ActorRef, mailboxCapacity: Int, pushTimeOut: Duration) =
new ThreadBasedDispatcher(actor, mailboxCapacity, pushTimeOut)
/**
* Creates an executor-based event-driven dispatcher serving multiple (millions) of actors through a thread pool.
* <p/>
* Has a fluent builder interface for configuring its semantics.
*/
def newExecutorBasedEventDrivenDispatcher(name: String) =
ThreadPoolConfigDispatcherBuilder(config => new ExecutorBasedEventDrivenDispatcher(name, config), ThreadPoolConfig())
/**
* Creates an executor-based event-driven dispatcher serving multiple (millions) of actors through a thread pool.
* <p/>
* Has a fluent builder interface for configuring its semantics.
*/
def newExecutorBasedEventDrivenDispatcher(name: String, throughput: Int, mailboxType: MailboxType) =
ThreadPoolConfigDispatcherBuilder(config =>
new ExecutorBasedEventDrivenDispatcher(name, throughput, THROUGHPUT_DEADLINE_TIME_MILLIS, mailboxType, config), ThreadPoolConfig())
/**
* Creates an executor-based event-driven dispatcher serving multiple (millions) of actors through a thread pool.
* <p/>
* Has a fluent builder interface for configuring its semantics.
*/
def newExecutorBasedEventDrivenDispatcher(name: String, throughput: Int, throughputDeadlineMs: Int, mailboxType: MailboxType) =
ThreadPoolConfigDispatcherBuilder(config =>
new ExecutorBasedEventDrivenDispatcher(name, throughput, throughputDeadlineMs, mailboxType, config), ThreadPoolConfig())
/**
* Creates an executor-based event-driven dispatcher, with work-stealing, serving multiple (millions) of actors through a thread pool.
* <p/>
* Has a fluent builder interface for configuring its semantics.
*/
def newExecutorBasedEventDrivenWorkStealingDispatcher(name: String) =
ThreadPoolConfigDispatcherBuilder(config => new ExecutorBasedEventDrivenWorkStealingDispatcher(name, config), ThreadPoolConfig())
/**
* Creates an executor-based event-driven dispatcher, with work-stealing, serving multiple (millions) of actors through a thread pool.
* <p/>
* Has a fluent builder interface for configuring its semantics.
*/
def newExecutorBasedEventDrivenWorkStealingDispatcher(name: String, throughput: Int) =
ThreadPoolConfigDispatcherBuilder(config =>
new ExecutorBasedEventDrivenWorkStealingDispatcher(name, throughput, THROUGHPUT_DEADLINE_TIME_MILLIS, MAILBOX_TYPE, config), ThreadPoolConfig())
/**
* Creates an executor-based event-driven dispatcher, with work-stealing, serving multiple (millions) of actors through a thread pool.
* <p/>
* Has a fluent builder interface for configuring its semantics.
*/
def newExecutorBasedEventDrivenWorkStealingDispatcher(name: String, throughput: Int, mailboxType: MailboxType) =
ThreadPoolConfigDispatcherBuilder(config =>
new ExecutorBasedEventDrivenWorkStealingDispatcher(name, throughput, THROUGHPUT_DEADLINE_TIME_MILLIS, mailboxType, config), ThreadPoolConfig())
/**
* Creates an executor-based event-driven dispatcher, with work-stealing, serving multiple (millions) of actors through a thread pool.
* <p/>
* Has a fluent builder interface for configuring its semantics.
*/
def newExecutorBasedEventDrivenWorkStealingDispatcher(name: String, throughput: Int, throughputDeadlineMs: Int, mailboxType: MailboxType) =
ThreadPoolConfigDispatcherBuilder(config =>
new ExecutorBasedEventDrivenWorkStealingDispatcher(name, throughput, throughputDeadlineMs, mailboxType, config), ThreadPoolConfig())
/**
* Utility function that tries to load the specified dispatcher config from the akka.conf
* or else use the supplied default dispatcher
*/
def fromConfig(key: String, default: => MessageDispatcher = defaultGlobalDispatcher): MessageDispatcher =
config getSection key flatMap from getOrElse default
/*
* Creates of obtains a dispatcher from a ConfigMap according to the format below
*
* default-dispatcher {
* type = "GlobalExecutorBasedEventDriven" # Must be one of the following, all "Global*" are non-configurable
* # (ExecutorBasedEventDrivenWorkStealing), ExecutorBasedEventDriven,
* # GlobalExecutorBasedEventDriven
* # A FQCN to a class inheriting MessageDispatcherConfigurator with a no-arg visible constructor
* keep-alive-time = 60 # Keep alive time for threads
* core-pool-size-factor = 1.0 # No of core threads ... ceil(available processors * factor)
* max-pool-size-factor = 4.0 # Max no of threads ... ceil(available processors * factor)
* executor-bounds = -1 # Makes the Executor bounded, -1 is unbounded
* allow-core-timeout = on # Allow core threads to time out
* rejection-policy = "caller-runs" # abort, caller-runs, discard-oldest, discard
* throughput = 5 # Throughput for ExecutorBasedEventDrivenDispatcher
* }
* ex: from(config.getConfigMap(identifier).get)
*
* Gotcha: Only configures the dispatcher if possible
* Returns: None if "type" isn't specified in the config
* Throws: IllegalArgumentException if the value of "type" is not valid
* IllegalArgumentException if it cannot
*/
def from(cfg: Configuration): Option[MessageDispatcher] = {
cfg.getString("type") map {
case "ExecutorBasedEventDriven" => new ExecutorBasedEventDrivenDispatcherConfigurator()
case "ExecutorBasedEventDrivenWorkStealing" => new ExecutorBasedEventDrivenWorkStealingDispatcherConfigurator()
case "GlobalExecutorBasedEventDriven" => GlobalExecutorBasedEventDrivenDispatcherConfigurator
case fqn =>
ReflectiveAccess.getClassFor[MessageDispatcherConfigurator](fqn) match {
case r: Right[_, Class[MessageDispatcherConfigurator]] =>
ReflectiveAccess.createInstance[MessageDispatcherConfigurator](r.b, Array[Class[_]](), Array[AnyRef]()) match {
case r: Right[Exception, MessageDispatcherConfigurator] => r.b
case l: Left[Exception, MessageDispatcherConfigurator] =>
throw new IllegalArgumentException("Cannot instantiate MessageDispatcherConfigurator type [%s], make sure it has a default no-args constructor" format fqn, l.a)
}
case l: Left[Exception, _] =>
throw new IllegalArgumentException("Unknown MessageDispatcherConfigurator type [%s]" format fqn, l.a)
}
} map {
_ configure cfg
}
}
}
object GlobalExecutorBasedEventDrivenDispatcherConfigurator extends MessageDispatcherConfigurator {
def configure(config: Configuration): MessageDispatcher = Dispatchers.globalExecutorBasedEventDrivenDispatcher
}
class ExecutorBasedEventDrivenDispatcherConfigurator extends MessageDispatcherConfigurator {
def configure(config: Configuration): MessageDispatcher = {
configureThreadPool(config, threadPoolConfig => new ExecutorBasedEventDrivenDispatcher(
config.getString("name", newUuid.toString),
config.getInt("throughput", Dispatchers.THROUGHPUT),
config.getInt("throughput-deadline-time", Dispatchers.THROUGHPUT_DEADLINE_TIME_MILLIS),
mailboxType(config),
threadPoolConfig)).build
}
}
class ExecutorBasedEventDrivenWorkStealingDispatcherConfigurator extends MessageDispatcherConfigurator {
def configure(config: Configuration): MessageDispatcher = {
configureThreadPool(config, threadPoolConfig => new ExecutorBasedEventDrivenWorkStealingDispatcher(
config.getString("name", newUuid.toString),
config.getInt("throughput", Dispatchers.THROUGHPUT),
config.getInt("throughput-deadline-time", Dispatchers.THROUGHPUT_DEADLINE_TIME_MILLIS),
mailboxType(config),
threadPoolConfig)).build
}
}
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