java - Managed beans and caching view lookups -

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from traditional notes development learned retrieving domino objects databases , views in script not effective, , should avoided in loops.

in xpages cannot serialize domino objects , retrieve same object many times. have example retrieving project data, based on project number stored in project related documents. bean scoped applicationscope , results cached.

public class projects{        private treemap<string, project> projectlist;         public projects() {         }         public project getprojectinfo(string projnum) {                project project = null;                if (projectlist==null) {                        projectlist = new treemap<string,project>();                }                 if (projectlist.containskey(projnum)) {                        project = projectlist.get(projnum);                } else {                        try {                                database projdb = dominoaccess.getdatabase("projects");                                view v = projdb.getview("(projlookup)");                                viewentry ve = v.getentrybykey(projnum);                                if (ve != null) {                                        project = new project(ve);                                         projectlist.put(projnum, project);                                }                        } catch (exception e) {                        }                }                 return project;        }  }

when first used in example repeat, database , view objects created each document. best practice or there better ways of solving this?

i know can put projects in map @ first use, not sure if best practice regarding memory?

when use in repeat control (e.g. 30 times), use 30x @dblookup. doesn't seem efficient. do: use view navigator rapidly read projects id , unid map. instead of doing @dblookup unid map , getdocumentbyunid load it. should faster. variation - if project data isn't big: save json representation field , put view navigator. way need read view (again have 2 variation of sequentially read or search through) , field.

let me know if need clarify further


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