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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.di
import com.yahoo.container.di.ConfigRetriever.{ComponentsConfigs, BootstrapConfigs}
import com.yahoo.container.di.componentgraph.core.{JerseyNode, ComponentGraph, ComponentNode}
import com.yahoo.container.di.config.{RestApiContext, SubscriberFactory}
import Container._
import scala.collection.JavaConversions._
import scala.math.max
import com.yahoo.config._
import com.yahoo.vespa.config.ConfigKey
import java.util.IdentityHashMap
import java.util.logging.Logger
import com.yahoo.container.bundle.BundleInstantiationSpecification
import com.google.inject.{Injector, Guice}
import com.yahoo.container.{BundlesConfig, ComponentsConfig}
/**
*
* @author gjoranv
* @author tonytv
*/
class Container(
subscriberFactory: SubscriberFactory,
configId: String,
componentDeconstructor: ComponentDeconstructor,
osgi: Osgi = new Osgi {}
)
{
val bundlesConfigKey = new ConfigKey(classOf[BundlesConfig], configId)
val componentsConfigKey = new ConfigKey(classOf[ComponentsConfig], configId)
var configurer = new ConfigRetriever(Set(bundlesConfigKey, componentsConfigKey), subscriberFactory.getSubscriber(_))
var previousConfigGeneration = -1L
var leastGeneration = -1L
@throws(classOf[InterruptedException])
def runOnce(
oldGraph: ComponentGraph = new ComponentGraph,
fallbackInjector: GuiceInjector = Guice.createInjector()): ComponentGraph = {
def deconstructObsoleteComponents(oldGraph: ComponentGraph, newGraph: ComponentGraph) {
val oldComponents = new IdentityHashMap[AnyRef, AnyRef]()
oldGraph.allComponentsAndProviders foreach(oldComponents.put(_, null))
newGraph.allComponentsAndProviders foreach(oldComponents.remove(_))
oldComponents.keySet foreach(componentDeconstructor.deconstruct(_))
}
try {
//TODO: wrap user exceptions.
val newGraph = createNewGraph(oldGraph, fallbackInjector)
newGraph.reuseNodes(oldGraph)
constructComponents(newGraph)
deconstructObsoleteComponents(oldGraph, newGraph)
newGraph
} catch {
case e : Throwable =>
invalidateGeneration()
throw e
}
}
private def invalidateGeneration() {
leastGeneration = max(configurer.getComponentsGeneration, configurer.getBootstrapGeneration) + 1
}
final def createNewGraph(graph: ComponentGraph = new ComponentGraph,
fallbackInjector: Injector): ComponentGraph = {
val snapshot = configurer.getConfigs(graph.configKeys, leastGeneration)
log.fine("""createNewGraph:
graph.configKeys = %s
graph.generation = %s
snapshot = %s
""".format(graph.configKeys, graph.generation, snapshot))
val preventTailRecursion =
snapshot match {
case BootstrapConfigs(configs) if getBootstrapGeneration > previousConfigGeneration =>
installBundles(configs)
createNewGraph(
createComponentsGraph(configs, getBootstrapGeneration,fallbackInjector),
fallbackInjector)
case BootstrapConfigs(_) =>
createNewGraph(graph, fallbackInjector)
case ComponentsConfigs(configs) =>
createAndConfigureComponentsGraph(configs, fallbackInjector)
}
preventTailRecursion
}
def getBootstrapGeneration: Long = {
configurer.getBootstrapGeneration
}
def getComponentsGeneration: Long = {
configurer.getComponentsGeneration
}
private def createAndConfigureComponentsGraph[T](
componentsConfigs: Map[ConfigKeyT, ConfigInstance],
fallbackInjector: Injector): ComponentGraph = {
val componentGraph = createComponentsGraph(componentsConfigs, getComponentsGeneration, fallbackInjector)
componentGraph.setAvailableConfigs(componentsConfigs)
componentGraph
}
def injectNodes(config: ComponentsConfig, graph: ComponentGraph) {
for {
component <- config.components()
inject <- component.inject()
} {
def getNode = ComponentGraph.getNode(graph, _: String)
//TODO: Support inject.name()
getNode(component.id()).inject(getNode(inject.id()))
}
}
def installBundles(configsIncludingBootstrapConfigs: Map[ConfigKeyT, ConfigInstance]) {
val bundlesConfig = getConfig(bundlesConfigKey, configsIncludingBootstrapConfigs)
osgi.useBundles(bundlesConfig.bundle())
}
private def createComponentsGraph[T](
configsIncludingBootstrapConfigs: Map[ConfigKeyT, ConfigInstance],
generation: Long,
fallbackInjector: Injector): ComponentGraph = {
previousConfigGeneration = generation
val graph = new ComponentGraph(generation)
val componentsConfig = getConfig(componentsConfigKey, configsIncludingBootstrapConfigs)
addNodes(componentsConfig, graph)
injectNodes(componentsConfig, graph)
graph.complete(fallbackInjector)
graph
}
def addNodes[T](componentsConfig: ComponentsConfig, graph: ComponentGraph) {
def isRestApiContext(clazz: Class[_]) = classOf[RestApiContext].isAssignableFrom(clazz)
def asRestApiContext(clazz: Class[_]) = clazz.asInstanceOf[Class[RestApiContext]]
for (config : ComponentsConfig.Components <- componentsConfig.components) {
val specification = bundleInstatiationSpecification(config)
val componentClass = osgi.resolveClass(specification)
val componentNode =
if (isRestApiContext(componentClass))
new JerseyNode(specification.id, config.configId(), asRestApiContext(componentClass), osgi)
else
new ComponentNode(specification.id, config.configId(), componentClass)
graph.add(componentNode)
}
}
private def constructComponents(graph: ComponentGraph) {
graph.nodes foreach (_.newOrCachedInstance())
}
def shutdown(graph: ComponentGraph, deconstructor: ComponentDeconstructor) {
shutdownConfigurer()
if (graph != null)
deconstructAllComponents(graph, deconstructor)
}
def shutdownConfigurer() {
configurer.shutdown()
}
// Reload config manually, when subscribing to non-configserver sources
def reloadConfig(generation: Long) {
subscriberFactory.reloadActiveSubscribers(generation)
}
def deconstructAllComponents(graph: ComponentGraph, deconstructor: ComponentDeconstructor) {
graph.allComponentsAndProviders foreach(deconstructor.deconstruct(_))
}
}
object Container {
val log = Logger.getLogger(classOf[Container].getName)
def getConfig[T <: ConfigInstance](key: ConfigKey[T], configs: Map[ConfigKeyT, ConfigInstance]) : T = {
key.getConfigClass.cast(configs.getOrElse(key.asInstanceOf[ConfigKeyT], sys.error("Missing config " + key)))
}
def bundleInstatiationSpecification(config: ComponentsConfig.Components) =
BundleInstantiationSpecification.getFromStrings(config.id(), config.classId(), config.bundle())
}
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