The iWay LDAP High Water Mark (HWM) listener follows the HWM design pattern by acquiring new or changed records (LDAP entries) from a data store (the LDAP server) that meet a specific, evolving criteria. The data that is returned is determined by the scope and the specified filter. To avoid retrieving duplicate entries, the LDAP HWM listener keeps track of the highest value of the filter attribute which has been read. Usually the filter value is the creation or modification time of the entry, but any unique and steadily increasing value can be used. Each entry satisfying the filter is returned as an iWay XML document for further processing in an iWay Service Manager channel.

The LDAP HWM listener is triggered (begins processing messages) when an entry is inserted or modified in the LDAP directory that is based on an increasing value of an attribute. The LDAP HWM listener works similar to the RDBMS HWM listener.

A diagnostic tool, testldap, is provided in the extension to manually access and explore the LDAP directory from the iSM command console.