如何访问（GET）在Java DSL骆驼头 [英] How to access (get) camel header in java dsl

问题描述

我有一个code一样 -

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m到处在日志中 -

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}]

我不是得到实际的标头值（文档编号）。结果
所以我的问题是 - 如何访问头在Java中的DSL这里

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

在日志中的DSL使用简单的语言： http://camel.apache.org/simple

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

所以，你需要做这样

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

如$ {} header.xxx通过简单的语言在运行时进行评估。

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

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