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Dynamic extensions loading allows to add selected extension to OpenHub application independently by each other.

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0) Prerequisite - extension configuration loader must be initialized

/**
 * OpenHub extensions loader where extensions are <bean class="org.openhubframework.openhub.core.common.extension.PropertiesExtensionConfigurationLoader" depends-on="camelContext">
        <constructor-arg ref="confProperties"/>
    </bean>defined in properties.
 * Relevant properties are with '{@value #PROPERTY_PREFIX}' prefix.
 */
@Service
@DependsOn("camelContext")
public class PropertiesExtensionConfigurationLoader extends AbstractExtensionConfigurationLoader {

1) add Maven dependency to specific extension

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<groupId>org.openhubframework.openhub.extensions<ext</groupId>
<artifactId>file-upload</artifactId>

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extensions.cfg (defined directly in OpenHub framework web-admin module) or extensions0.cfg (has higher priority) defines references to Spring root configuration files for each extension. Each property has to starts with context.ext prefix.

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There is the following Spring context hierarchy:

• root context Camel - Camel (Spring Web Service) context + Spring MVC (admin) context
  
  • extension1 context
  • extension2 contextSpring MVC (admin) context