spring Conditional bean registration in Spring Register beans only when a property or value is specified
Example
A spring bean can be configured such that it will register only if it has a particular value or a specified property is met. To do so, implement Condition.matches to check the property/value:
public class PropertyCondition implements Condition {
@Override
public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
return context.getEnvironment().getProperty("propertyName") != null;
// optionally check the property value
}
}
In Java config, use the above implementation as a condition to register the bean. Note the use of @Conditional annotation.
@Configuration
public class MyAppConfig {
@Bean
@Conditional(PropertyCondition.class)
public MyBean myBean() {
return new MyBean();
}
}
In PropertyCondition, any number of conditions can be evaluated. However it is advised to separate the implementation for each condition to keep them loosely coupled. For example:
@Configuration
public class MyAppConfig {
@Bean
@Conditional({PropertyCondition.class, SomeOtherCondition.class})
public MyBean myBean() {
return new MyBean();
}
}
