如何在java dsl中访问(获取)camel header [英] How to access (get) camel header in java dsl

问题描述

我有一个类似的代码 -

I have a code like -

        // use streaming to increase index throughput
            .setHeader(SolrConstants.OPERATION,
                    constant(SolrConstants.OPERATION_INSERT_STREAMING))
            // define solr endpoint and options
            .to("solr://"
                    + getSolrEndPoint()
                    + "?defaultMaxConnectionsPerHost=500&streamingThreadCount=500&maxRetries=3")
            .log(LoggingLevel.INFO, "Successfully indexed document id [" +header(BatchHeaders.DOCUMENT_ID) +"]")
            // end this route
            .end();

但我在日志中得到的是 -

But what I m getting in the log is -

severity="INFO " thread="Camel (camel-1) thread #123 - seda://insert" category="route2" Successfully indexed document id [header{DOC_ID}]

我没有得到实际的标题值(文档 ID).
所以我的问题是 - 如何在这里访问 Java DSL 中的标头?

I m not getting the actual header value (the document id).
So my question is - How to access the headers in Java DSL here?

推荐答案

DSL中的日志使用简单语言:http://camel.apache.org/simple.

The log in the DSL uses the simple language: http://camel.apache.org/simple.

所以你需要这样做:

    .log(LoggingLevel.INFO, "Successfully indexed document id [${header." + BatchHeaders.DOCUMENT_ID + "}]")

例如${header.xxx} 在运行时由简单语言评估.

e.g. the ${header.xxx} is evaluated at runtime by the simple language.

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