Question

在我的Scala项目中，我尝试使用新的RestHighLevelClient更改旧的transportClient，以连接到Elasticsearch（6.1）。

但是我在尝试创建BulkProcessor时遇到问题，我不知道如何将此示例从Java转换为Scala

`BulkProcessor.Builder builder = BulkProcessor.builder(client::bulkAsync, listener);`

我的代码是：

val client=new RestHighLevelClient(
  RestClient.builder(
    new HttpHost("localhost", 9200, "http") ) )

val builder: BulkProcessor.Builder =BulkProcessor.builder(client, listener)

但是我得到了这个错误：

 overloaded method value builder with alternatives:
[error]   (x$1: java.util.function.BiConsumer[org.elasticsearch.action.bulk.BulkRequest,org.elasticsearch.action.ActionListener[org.elasticsearch.action.bulk.BulkResponse]],x$2: org.elasticsearch.action.bulk.BulkProcessor.Listener)org.elasticsearch.action.bulk.BulkProcessor.Builder <and>
[error]   (x$1: org.elasticsearch.client.Client,x$2: org.elasticsearch.action.bulk.BulkProcessor.Listener)org.elasticsearch.action.bulk.BulkProcessor.Builder
[error]  cannot be applied to (org.elasticsearch.client.RestHighLevelClient, org.elasticsearch.action.bulk.BulkProcessor.Listener)
[error]   val builder: BulkProcessor.Builder =BulkProcessor.builder(client, listener)

如果我尝试转换＆＃34; client::bulkAsync＆＃34;用＆＃34; client.bulkAsync _＆＃34;或＆＃34; client::bulkAsync(_._._)＆＃34;获取其他错误：

type mismatch;
[error] found   : org.apache.http.Header*
[error] required: org.apache.http.Header
[error] var bulkProcessor =BulkProcessor.builder(client.bulkAsync(_,_,_),listener)

这是Java中的方法bulkAsync：

 public final void bulkAsync(BulkRequest bulkRequest, ActionListener<BulkResponse> listener, Header... headers) {

有没有人在Scala中使用RestHighLevelClient和BulkProcessor？或知道如何修复此错误？

Answer 1

Scala 2.11与Java 8函数接口没有很好的互操作性。创建BiConsumerId（接受两个输入参数并且不返回结果）应该可以解决此问题：

val bulkAsyncAsJava :  BiConsumer[BulkRequest, ActionListener[BulkResponse]] = new BiConsumer[BulkRequest, ActionListener[BulkResponse]] {
  override def accept(bulkRequest : BulkRequest , actionListener:ActionListener[BulkResponse]): Unit = {
    restHighLevelClient.bulkAsync(bulkRequest, actionListener)
  }
}
val bulkProcessor = BulkProcessor.builder(bulkAsyncAsJava, new BulkProcessor.Listener() {
override def beforeBulk(executionId: Long, request: BulkRequest): Unit = {
}

override

def afterBulk(executionId: Long, request: BulkRequest, response: BulkResponse): Unit = {
}

override

def afterBulk(executionId: Long, request: BulkRequest, failure: Throwable): Unit = {
}}).build

Scala，Elasticsearch新的RestHighLevelClient和BulkProcessor

1 个答案: