Talend：如何 return 来自 tESBProviderResponse 中 tRunJob 的值？

Question

运行在 Web 服务中创建子作业时是否需要一些特殊的东西？

我知道我可以通过 tRunJob 的上下文传递值并通过 tRunJob 模式（通过 tBufferOutput 组件呈现）检索值。但是，当从 Web 服务运行时，这似乎不起作用；即，调用包含 tESBProviderRequest 和 tESBProviderResponse 的服务的 tESBConsumer。通过 tRunJob 上下文传递值有效，但通过 tRunJob 模式检索值无效。在下面的输出中，"service_received_from_child" 输出显示来自 tRunJob 的空值。

[statistics] connecting to socket on port 3744
[statistics] connected
.------------------.
|  client_passed_to_service |
|=----------------=|
|Id                |
|=----------------=|
|a7d0b000000XamBAAS|
'------------------'

.------+------.
|client_received_from_service |
|=-----+-----=|
|Status|CaseId|
|=-----+-----=|
'------+------'

[statistics] disconnected

.------------------.
|  child_received_from_service |
|=----------------=|
|Id                |
|=----------------=|
|a7d0b000000XamBAAS|
'------------------'

.------------------------------------+----------.
|                child_returned_to_service      |
|=-----------------------------------+---------=|
|result                              |case_id   |
|=-----------------------------------+---------=|
|Test: Received Id a7d0b000000XamBAAS|0987654321|
'------------------------------------+----------'

.------------------.
|  service_passed_to_child |
|=----------------=|
|Id                |
|=----------------=|
|a7d0b000000XamBAAS|
'------------------'

.------+-------.
|service_received_from_child |
|=-----+------=|
|result|case_id|
|=-----+------=|
|null  |null   |
'------+-------'

我构建了一个测试父作业来执行同一个子作业，它工作正常，通过 tRunJob 上下文传递值并从 tRunJob 模式检索值。在下面的输出中，"parent_received_from_child" 输出显示了 tRunJob 的正确结果。

[statistics] connecting to socket on port 4045
[statistics] connected
.------------------.
|  child_received_from_parent |
|=----------------=|
|Id                |
|=----------------=|
|a7d0b000000XamBAAS|
'------------------'

.------------------------------------+----------.
|                child_returned_to_parent       |
|=-----------------------------------+---------=|
|result                              |case_id   |
|=-----------------------------------+---------=|
|Test: Received Id a7d0b000000XamBAAS|0987654321|
'------------------------------------+----------'

.------------------------------------+----------.
|                parent_received_from_child     |
|=-----------------------------------+---------=|
|result                              |case_id   |
|=-----------------------------------+---------=|
|Test: Received Id a7d0b000000XamBAAS|0987654321|
'------------------------------------+----------'

[statistics] disconnected

Answer 1

找到答案了：输入流好像不能直接连接到tRunJob，必须先经过一个tFlowToIterate，再到tRunJob。进行此更改后，客户端会收到正确的值。

我猜是因为 Web 服务连续运行并且每个请求都是一个新的 "row" 通过流程所以需要迭代才能单独处理每个请求(?)

Talend：如何 return 来自 tESBProviderResponse 中 tRunJob 的值？

Talend: How to return values from tRunJob in tESBProviderResponse?

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