Github user trkurc commented on a diff in the pull request: https://github.com/apache/nifi/pull/271#discussion_r56103351 --- Diff: nifi-nar-bundles/nifi-spring-bundle/nifi-spring-processors/src/main/resources/docs/org.apache.nifi.spring.SpringContextProcessor/additionalDetails.html --- @@ -0,0 +1,94 @@ +<!DOCTYPE html> +<html lang="en"> + <!-- + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with + the License. You may obtain a copy of the License at + http://www.apache.org/licenses/LICENSE-2.0 + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + --> + <head> + <meta charset="utf-8" /> + <title>SpringContextProcessor</title> + <link rel="stylesheet" href="../../css/component-usage.css" type="text/css" /> + </head> + + <body> + <!-- Processor Documentation ================================================== --> + <h2>Description:</h2> + <p> + <b>SpringContextProcessor</b> â allows integration of processes encapsulated in Spring Application Context to run as NiFi + processor by becoming a runtime host for an instance of Spring Application Context. + </p> + <p> + Communication between NiFi and process encapsulated within Spring Application Context is accomplished via Spring Messaging + (one of the core modules of Spring Framework) and supports 3 usage modes: + <ul> + <li><i>Headless</i> - no interaction with NiFi, meaning nothing is sent to it and nothing is received from it (i.e., some monitoring app). + In this case NiFi simply plays the role of the runtime host.</li> + <li><i>One way (NiFi -> Spring or Spring -> NiFi). </i> - This depends on existence of pre-defined message channel in Spring + Application Context. The name of the channel should be âfromNiFiâ and the type <i>org.springframework.messaging.MessageChannel.</i></li> + <li><i>By-directional (NiFi -> Spring -> Nifi or Spring -> NiFi -> Spring)</i> - This depends on existence of two channels + in Spring Application Context. One channel receives messages from NiFi with name âfromNiFiâ and type <i>org.springframework.messaging.MessageChannel</i>i> + and another is o receive messages from Spring with name âtoNiFiâ and type <i>org.springframework.messaging.PollableChannel.</i></li> + </ul> + The example below demonstrates template configuration for bi-directional Spring Application Context configuration: + <code> + <pre> + <int:channel id=âfromNiFiâ/> + + <!â + your custom app configuration to receive messages from âfromNiFiâ channel and optionally send back to NiFi via âtoNiFiâ channel. + It could contain any Spring-based application (i.e., Spring Integration, Apache Camel and/or custom code). All you need to do is inject + channels into your beans and send/receive messages from it. + --> + + <int:channel id="toNiFi"> + <int:queue/> + </int:channel> + </pre> + </code> + </p> + <p> + The component is based on assumption that user has an existing Spring Application encapsulated in Spring Context that exposes optional in/out + MessagingChannels to allow data to flow to/from ApplicationContext and into/out-of. NiFi. + Such application is realized by having a directory on the file system, which contains contains all required resources for such application to run. + Such resources usually are JAR files to satisfy application's class-path as well as JAR representing the application and its configuration. + Below is the example of what such directory may contain. In this case the 'SI_DEMO-0.0.1-SNAPSHOT.jar' represents the actual application and the rest + of the JARs represent class-path dependency required by an application. + <pre> + deps + âââ SI_DEMO-0.0.1-SNAPSHOT.jar + âââ aopalliance-1.0.jar + âââ commons-logging-1.2.jar + âââ spring-aop-4.2.4.RELEASE.jar + âââ spring-beans-4.2.4.RELEASE.jar + âââ spring-context-4.2.4.RELEASE.jar + âââ spring-core-4.2.4.RELEASE.jar + âââ spring-expression-4.2.4.RELEASE.jar + âââ spring-integration-core-4.2.5.RELEASE.jar + âââ spring-messaging-4.2.4.RELEASE.jar + </pre> + </p> + <p> + You introduce the processor the usual way and then configure its properties: + <ul> + <li><i><b>Application Context config path</b></i> [REQUIRED] - a path to the Application Context configuration. + The path is relative to the class-path of the application defined by the <i>Application Context class path</i> property </li> + <li><i><b>Application Context class path</b></i> [REQUIRED] - a path to a directory on the file system where application dependencies are. </li> + <li><i>Send Timeout</i> [OPTIONAL] - the wait time for sending messages to Spring Application Context. Only required if NiFi plans to send data o Spring. --- End diff -- Typo: s/ o / to /
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