public java.util.List<String> getSourceIds() {
        return sourceIds;
    }
<p>
The list of identifiers of the event sources for which events are returned. If not specified, then all sources
are included in the response. An identifier must begin with a letter and must contain only ASCII letters, digits,
and hyphens; it can't end with a hyphen or contain two consecutive hyphens.
</p>
<p>
Constraints:
</p>
<ul>
<li>
<p>
If <code>SourceIds</code> are provided, <code>SourceType</code> must also be provided.
</p>
</li>
<li>
<p>
If the source type is an instance, a <code>DBInstanceIdentifier</code> must be provided.
</p>
</li>
<li>
<p>
If the source type is a security group, a <code>DBSecurityGroupName</code> must be provided.
</p>
</li>
<li>
<p>
If the source type is a parameter group, a <code>DBParameterGroupName</code> must be provided.
</p>
</li>
<li>
<p>
If the source type is a snapshot, a <code>DBSnapshotIdentifier</code> must be provided.
</p>
</li>
</ul>

@return The list of identifiers of the event sources for which events are returned. If not specified, then all
        sources are included in the response. An identifier must begin with a letter and must contain only ASCII
        letters, digits, and hyphens; it can't end with a hyphen or contain two consecutive hyphens.</p>
        <p>
        Constraints:
        </p>
        <ul>
        <li>
        <p>
        If <code>SourceIds</code> are provided, <code>SourceType</code> must also be provided.
        </p>
        </li>
        <li>
        <p>
        If the source type is an instance, a <code>DBInstanceIdentifier</code> must be provided.
        </p>
        </li>
        <li>
        <p>
        If the source type is a security group, a <code>DBSecurityGroupName</code> must be provided.
        </p>
        </li>
        <li>
        <p>
        If the source type is a parameter group, a <code>DBParameterGroupName</code> must be provided.
        </p>
        </li>
        <li>
        <p>
        If the source type is a snapshot, a <code>DBSnapshotIdentifier</code> must be provided.
        </p>
        </li>
aws-java-sdk-docdb/src/main/java/com/amazonaws/services/docdb/model/CreateEventSubscriptionRequest.java