从 Play 框架异步调用 Solr [英] Call Solr asynchronous from Play Framework

问题描述

我创建了一个 Play 2.1 Scala 应用程序.我不确定从 Play 应用程序调用 Solr 的最佳方式是什么:

I have created a Play 2.1 Scala application. I am uncertain what's the best way to call Solr from a Play application:

• Play 2 没有 Solr 模块.
• AFAIK 所有像 SolrJ 这样的 Solr-API 都被阻塞了.
• 我可以将 SolrJ 调用包装到 Future 中，但这也会阻塞线程，对吗?

• 我应该使用 play.api.libs.ws.WS 库来调用 Solr 并使用 Plays JSON 支持来提取结果(如下例所示)还是有任何更简单/更快的方法?

• There is no Solr module for Play 2.
• AFAIK all Solr-APIs like SolrJ are blocking.
• I could wrap a SolrJ call into a Future, but this will also block a thread, correct?

• Should I use the play.api.libs.ws.WS library to call Solr and use Plays JSON support to extract the result (like in the example below) or is there any easier/faster way?

val solrQuery: Future[play.api.libs.ws.Response] = WS.url("http://localhost:8983/solr/collection1/select?q=id%3A123&wt=json").get()

推荐答案

以下是我在我的业余项目中使用 WS 的方式:

Here's how I use WS in my side project:

val itselfNodeFuture = Statix.doParams( Statix.SolrSelectWSReq, 
    List(
    "wt"     -> "json", 
    "q"      -> "*:*",
    "fq"     -> "node_type:collection",
    "fq"     -> "id:%d".format( nodeId),
    "indent" -> "true",
    "rows"   -> "1",
    "fl"     -> "id,parent_id,title",
    "fl"     -> "date_created,date_about,date_modified")
).get()

//Use the first Await after the last future
val itselfJson = Await.result(
    itselfNodeFuture, Duration("2 sec")).json

val mainRow = (itselfJson  "response"  "docs").as[ Seq[JsValue]]
val mainNodeParent = (mainRow(0)  "parent_id").as[Long]
val mainNodeTitle = (mainRow(0)  "title").as[String]

这是我使用的实用程序类，doParams 特别有用.

And here's the utility class I use, the doParams is especially useful.

object Statix { //Noder must extend this
    def SolrSelectWSReq = WS.url("http://127.0.0.1:8080/solr-store/collection1/select/")
    def SolrUpdateWSReq = WS.url("http://127.0.0.1:8080/solr-store/collection1/update/json/")

    def doParams(request: WS.WSRequestHolder, params: List[(String, String)]) = {
        params.foldLeft( request){
            (wsReq, tuple) => wsReq.withQueryString( tuple)}}
}

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