Play 2.4测试出错:CacheManager已关闭.它不能再使用了

Question

我们的应用程序基于Play 2.4与Scala 2.11和Akka构建.使用的数据库是MySQL.

缓存在我们的应用程序中大量使用.我们使用Play的默认EhCache进行缓存.

我们的示例代码段:

import play.api.Play.current
import play.api.cache.Cache

case class Sample(var id: Option[String],
                 //.. other fields
)

class SampleTable(tag: Tag)
  extends Table[Sample](tag, "SAMPLE") {
  def id = column[Option[String]]("id", O.PrimaryKey)
  // .. other field defs
}

object SampleDAO extends TableQuery(new SampleTable(_)) with SQLWrapper {
  def get(id: String) : Future[Sample] = {
    val cacheKey = // our code to generate a unique cache key
    Cache.getOrElse[Future[[Sample]](cacheKey) {
      db.run(this.filter(_.id === id).result.headOption)
    }
  }
}

我们使用Play的内置Specs2进行测试.

var id = "6879a389-aa3c-4074-9929-cca324c7a01f"

  "Sample Application " should {
    "Get a Sample" in new WithApplication {
      val req = FakeRequest(GET, s"/v1/samples/$id")
      val result = route(req).get
      assertEquals(OK, status(result))
      id = (contentAsJson(result).\("id")).get.toString().replaceAllLiterally("\"", "")
   }

但是在单元测试时我们经常会遇到以下错误.

[error]    1) Error in custom provider, java.lang.IllegalStateException: The  CacheManager has been shut down. It can no longer b
e used.
[error]      at play.api.cache.EhCacheModule.play$api$cache$EhCacheModule$$bindCache$1(Cache.scala:181):
[error]    Binding(interface net.sf.ehcache.Ehcache qualified with QualifierInstance(@play.cache.NamedCache(value=play)) to Prov
iderTarget(play.api.cache.NamedEhCacheProvider@7c8b0968)) (via modules: com.google.inject.util.Modules$OverrideModule -> play.ap
i.inject.guice.GuiceableModuleConversions$$anon$1)
[error]      while locating net.sf.ehcache.Ehcache annotated with @play.cache.NamedCache(value=play)
[error]      at play.api.cache.EhCacheModule.play$api$cache$EhCacheModule$$bindCache$1(Cache.scala:182):
[error]    Binding(interface play.api.cache.CacheApi qualified with QualifierInstance(@play.cache.NamedCache(value=play)) to Pro
viderTarget(play.api.cache.NamedCacheApiProvider@38514c74)) (via modules: com.google.inject.util.Modules$OverrideModule -> play.
api.inject.guice.GuiceableModuleConversions$$anon$1)
[error]      while locating play.api.cache.CacheApi annotated with @play.cache.NamedCache(value=play)
[error]      while locating play.api.cache.CacheApi
[error]
[error]    1 error (InjectorImpl.java:1025)
[error] com.google.inject.internal.InjectorImpl$2.get(InjectorImpl.java:1025)
[error] com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1051)
[error] play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:321)
[error] play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:316)
[error] play.api.Application$$anonfun$instanceCache$1.apply(Application.scala:234)
[error] play.api.Application$$anonfun$instanceCache$1.apply(Application.scala:234)
[error] play.utils.InlineCache.fresh(InlineCache.scala:69)
[error] play.utils.InlineCache.apply(InlineCache.scala:62)
[error] play.api.cache.Cache$.cacheApi(Cache.scala:63)
[error] play.api.cache.Cache$.getOrElse(Cache.scala:106

我们期待在解决上述问题或专门为测试实现模拟缓存的方法方面提供帮助.

提前致谢.

Answer 1

我有一个类似的问题,所以我删除了一个缓存实现并交换它进行测试.

class FakeCache extends CacheApi {
  override def set(key: String, value: Any, expiration: Duration): Unit = {}

  override def get[T](key: String)(implicit evidence$2: ClassManifest[T]): Option[T] = None

  override def getOrElse[A](key: String, expiration: Duration)(orElse: => A)(implicit evidence$1: ClassManifest[A]): A = orElse

  override def remove(key: String): Unit = {}
}

覆盖注入:

class AbstractViewTest extends PlaySpecification {

  def testApp(handler: DeadboltHandler): Application = new GuiceApplicationBuilder()
                                                   .overrides(bind[CacheApi].to[FakeCache])
                                                   .in(Mode.Test)
                                                   .build()

}

您可以在GitHub上看到我如何使用它:https://github.com/schaloner/deadbolt-2-scala/blob/master/code/test/be/objectify/deadbolt/scala/views/AbstractViewTest.scala