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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.servlet.jersey
import java.io.{IOException, InputStream}
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module
import com.fasterxml.jackson.jaxrs.json.JacksonJaxbJsonProvider
import com.yahoo.container.di.componentgraph.Provider
import com.yahoo.container.di.config.RestApiContext
import com.yahoo.container.di.config.RestApiContext.BundleInfo
import com.yahoo.container.jaxrs.annotation.Component
import com.yahoo.container.servlet.jersey.util.ResourceConfigUtil.registerComponent
import org.eclipse.jetty.servlet.ServletHolder
import org.glassfish.hk2.api.{InjectionResolver, TypeLiteral}
import org.glassfish.hk2.utilities.Binder
import org.glassfish.hk2.utilities.binding.AbstractBinder
import org.glassfish.jersey.media.multipart.MultiPartFeature
import org.glassfish.jersey.server.ResourceConfig
import org.glassfish.jersey.servlet.ServletContainer
import org.objectweb.asm.ClassReader
import scala.collection.JavaConverters._
import scala.util.control.Exception
/**
* @author tonytv
*/
class JerseyServletProvider(restApiContext: RestApiContext) extends Provider[ServletHolder] {
private val jerseyServletHolder = new ServletHolder(new ServletContainer(resourceConfig(restApiContext)))
private def resourceConfig(restApiContext: RestApiContext) = {
val resourceConfig = ResourceConfig.forApplication(
new JerseyApplication(resourcesAndProviders(restApiContext.getBundles.asScala)))
registerComponent(resourceConfig, componentInjectorBinder(restApiContext))
registerComponent(resourceConfig, jacksonDatatypeJdk8Provider)
resourceConfig.register(classOf[MultiPartFeature])
resourceConfig
}
def resourcesAndProviders(bundles: Traversable[BundleInfo]) =
(for {
bundle <- bundles.view
classEntry <- bundle.getClassEntries.asScala
className <- detectResourceOrProvider(bundle.classLoader, classEntry)
} yield loadClass(bundle.symbolicName, bundle.classLoader, className)).toSet
def detectResourceOrProvider(bundleClassLoader: ClassLoader, classEntry: String): Option[String] = {
using(getResourceAsStream(bundleClassLoader, classEntry)) { inputStream =>
val visitor = ResourceOrProviderClassVisitor.visit(new ClassReader(inputStream))
visitor.getJerseyClassName
}
}
private def getResourceAsStream(bundleClassLoader: ClassLoader, classEntry: String) = {
bundleClassLoader.getResourceAsStream(classEntry) match {
case null => throw new RuntimeException(s"No entry $classEntry in bundle $bundleClassLoader")
case stream => stream
}
}
def using[T <: InputStream, R](stream: T)(f: T => R): R = {
try {
f(stream)
} finally {
Exception.ignoring(classOf[IOException]) {
stream.close()
}
}
}
def loadClass(bundleSymbolicName: String, classLoader: ClassLoader, className: String) = {
try {
classLoader.loadClass(className)
} catch {
case e: Exception => throw new RuntimeException(s"Failed loading class $className from bundle $bundleSymbolicName", e)
}
}
def componentInjectorBinder(restApiContext: RestApiContext): Binder = {
val componentGraphProvider = new ComponentGraphProvider(restApiContext.getInjectableComponents.asScala)
val componentAnnotationType = new TypeLiteral[InjectionResolver[Component]] {}
new AbstractBinder {
override def configure() {
bind(componentGraphProvider).to(componentAnnotationType)
}
}
}
def jacksonDatatypeJdk8Provider: JacksonJaxbJsonProvider = {
val provider = new JacksonJaxbJsonProvider()
provider.setMapper(new ObjectMapper().registerModule(new Jdk8Module))
provider
}
override def get() = jerseyServletHolder
override def deconstruct() {}
}
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