public String getSourceType() {
        return this.sourceType;
    }
<p>
The type of source that is generating the events. For example, if you want to be notified of events generated by
an instance, you would set this parameter to <code>db-instance</code>. If this value is not specified, all events
are returned.
</p>
<p>
Valid values: <code>db-instance</code>, <code>db-cluster</code>, <code>db-parameter-group</code>,
<code>db-security-group</code>, <code>db-cluster-snapshot</code>
</p>

@return The type of source that is generating the events. For example, if you want to be notified of events
        generated by an instance, you would set this parameter to <code>db-instance</code>. If this value is not
        specified, all events are returned.</p>
        <p>
        Valid values: <code>db-instance</code>, <code>db-cluster</code>, <code>db-parameter-group</code>,
        <code>db-security-group</code>, <code>db-cluster-snapshot</code>
aws-java-sdk-docdb/src/main/java/com/amazonaws/services/docdb/model/CreateEventSubscriptionRequest.java