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[英]Akka Send Delayed Message to self cannot Find implicit ExecutionContext
[英]Play Framework 2.1 - Cannot find an implicit ExecutionContext
我正在調用這樣的網絡服務:
WS
.url(url)
.get
.map { response => // error occurs on this line
response.status match {
case 200 => Right(response.json)
case status => Left(s"Problem accessing api, status '$status'")
}
}
完整的錯誤: Error: Cannot find an implicit ExecutionContext, either require one yourself or import ExecutionContext.Implicits.global
根據此問題,它已在文檔中修復。 我需要添加以下導入:
import play.api.libs.concurrent.Execution.Implicits._
從 Play 2.6 開始,建議對execution context
使用 guice 依賴注入。
默認執行上下文注入:
富斯卡
class Foo @Inject()()(implicit ec:ExecutionContext) {
def bar() = {
WS.url(url)
.get
.map { response => // error occurs on this line
response.status match {
case 200 => Right(response.json)
case status => Left(s"Problem accessing api, status '$status'")
}
}
}
自定義執行上下文注入:
應用程序配置文件
# db connections = ((physical_core_count * 2) + effective_spindle_count)
fixedConnectionPool = 9
database.dispatcher {
executor = "thread-pool-executor"
throughput = 1
thread-pool-executor {
fixed-pool-size = ${fixedConnectionPool}
}
}
數據庫執行上下文.scala
@Singleton
class DatabaseExecutionContext @Inject()(system: ActorSystem) extends CustomExecutionContext(system,"database.dispatcher")
富斯卡
class Foo @Inject()(implicit executionContext: DatabaseExecutionContext ) { ... }
更多信息請訪問:
https://www.playframework.com/documentation/2.6.x/Migration26#play.api.libs.concurrent.Execution-is-deprecated https://www.playframework.com/documentation/2.6.x/Highlights26#CustomExecutionContext -and-Thread-Pool-Sizing
另一種選擇:
import scala.concurrent.ExecutionContext.Implicits.global
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