I don't really see how this feature could ehance the implementation of business logic.

Unless you you have a very good use case, I'm not convinced ;-)

me neither

Sorry for stepping into this one, but we do this using parameters, and evaluating them in the execution, if needed. Example:

public class FindLdapSubscription implements Activity {

 public FindLdapSubscription(String capabilityId) {
 this.ldapCapabilityId = capabilityId;
 }

 public void execute(Execution execution) throws Exception {
 if (!validateParams(execution))
 throw new Exception("Ldap parameters to Activity not valid");
 // Connect to Ldap etc...
 }

 protected boolean validateActivity(Execution execution){
 // If filterVariable is Set, evaluate it through ScriptEvaluator
 // and leave result value in filter

 ....

 }

 protected String ldapCapabilityId;

 protected int numResults = -1;

 protected int timeout = 1000;

 protected int scope = Scopes.OBJECT.ordinal();

 protected Object dn = null;

 protected enum Scopes {
 OBJECT, ONE_LEVEL, SUBTREE
 }

 public String getLdapCapabilityId() {
 return ldapCapabilityId;
 }

 public FindLdapSubscription setLdapCapabilityId(String ldapCapabilityId) {
 this.ldapCapabilityId = ldapCapabilityId;
 return this;
 }

 protected String filter;
 protected String filterVariable;

 public String getFilter() {
 return filter;
 }

 public FindLdapSubscription setFilter(String filter) {
 this.filter = filter;
 return this;
 }

 public String getFilterVariable() {
 return filterVariable;
 }
 public FindLdapSubscription setFilterVariable(String filter) {
 this.filterVariable = filter;
 return this;
 }

 public int getNumResults() {
 return numResults;
 }

 public FindLdapSubscription setNumResults(int numResults) {
 this.numResults = numResults;
 return this;
 }

 public int getTimeout() {
 return timeout;
 }

 public FindLdapSubscription setTimeout(int timeout) {
 this.timeout = timeout;
 return this;
 }

 public int getScope() {
 return scope;
 }

 public FindLdapSubscription setScope(Scopes scope) {
 this.scope = scope.ordinal();
 return this;
 }

 public Object getDn() {
 return dn;
 }

 public FindLdapSubscription setDn(Object dn) {
 this.dn = dn;
 return this;
 };
 protected String targetVariableName;

 public FindLdapSubscription setTargetVariable(String targetVarName) {
 this.targetVariableName = targetVarName;
 return this;
 }

 protected List<String> attributes = new ArrayList<String>();

 public List<String> getAttributes() {
 return attributes;
 }

 public FindLdapSubscription setAttributes(List<String> attributes) {
 this.attributes = attributes;
 return this;
 }

 public FindLdapSubscription addAttribute(String attribute) {
 this.attributes.add(attribute);
 return this;
 }

}