JobAdSearchResults IJobAdSearchService.SearchSuggested(Guid?memberId, JobAdSearchQuery searchQuery)
{
const string method = "GetSuggestedJobs";
try
{
if (memberId == null)
{
return(new JobAdSearchResults());
}
var reader = GetReader();
var searcher = new Searcher(reader);
var member = _membersQuery.GetMember(memberId.Value);
var candidate = _candidatesQuery.GetCandidate(memberId.Value);
if (member == null || candidate == null || candidate.ResumeId == null)
{
return(new JobAdSearchResults());
}
var resume = _resumesQuery.GetResume(candidate.ResumeId.Value);
//Get a MLT query based on the candidate's details
var mlt = new MoreLikeThis(reader, CreateSimilarity());
mlt.setAnalyzer(_contentAnalyzer);
mlt.setMaxNumTokensParsed(10000); //increase for long resumes
mlt.setFieldNames(new[] { FieldName.Content });
mlt.setMinWordLen(3); //exclude UK, BBC and the like
mlt.setMaxQueryTerms(20);
//mlt.setBoost(true);
var candidateMltQuery = GetCandidateMltQuery(mlt, candidate, resume, method);
mlt.setFieldNames(new[] { FieldName.Title });
var candidateTitleMltQuery = GetCandidateMltQuery(mlt, candidate, resume, method);
#region Log
if (EventSource.IsEnabled(Event.Trace))
{
EventSource.Raise(Event.Trace, method, "Candidate MLT Query",
Event.Arg("Query",
candidateMltQuery == null ? "null" : candidateMltQuery.toString()));
EventSource.Raise(Event.Trace, method, "Candidate Title MLT Query",
Event.Arg("Query",
candidateTitleMltQuery == null
? "null"
: candidateTitleMltQuery.toString()));
}
#endregion
var mltQueries = new BooleanQuery(); // Up to 3 MLT queries ORed together
var titleQueries = new BooleanQuery();
// (Optionally) Desired Job Title and up to 3 job titles ORed together
var combinedFilter = new BooleanFilter();
// Filtering including exclusion of past applications and salary, location, etc.
var combinedQuery = new BooleanQuery(); // mltQueries and titleQueries ANDed together
if (candidateMltQuery != null)
{
mltQueries.add(candidateMltQuery, BooleanClause.Occur.SHOULD);
}
if (candidateTitleMltQuery != null)
{
mltQueries.add(candidateTitleMltQuery, BooleanClause.Occur.SHOULD);
}
//Get a MLT query based on the candidate's past 3 months of applications
var jobAdIds = (from a in _memberApplicationsQuery.GetApplications(member.Id)
where a.CreatedTime >= DateTime.Now.AddMonths(-3)
select a.PositionId).ToList();
if (jobAdIds.Any())
{
mlt.setFieldNames(new[] { FieldName.Content });
var applicationsMltQuery = GetApplicationsMltQuery(mlt, jobAdIds);
if (applicationsMltQuery != null)
{
mltQueries.add(applicationsMltQuery, BooleanClause.Occur.SHOULD);
}
#region Log
if (EventSource.IsEnabled(Event.Trace))
{
EventSource.Raise(Event.Trace, method, "Applications MLT Query",
Event.Arg("Query",
applicationsMltQuery == null
? "null"
: applicationsMltQuery.toString()));
}
#endregion
// ensure the jobs that have already been applied for are not in the results
var idFilter = new SpecialsFilter(SearchFieldName.Id, false,
jobAdIds.Select(id => id.ToFieldValue()));
combinedFilter.add(new FilterClause(idFilter, BooleanClause.Occur.MUST_NOT));
#region Log
if (EventSource.IsEnabled(Event.Trace))
{
EventSource.Raise(Event.Trace, method, "Combined Filter #1",
Event.Arg("Query", combinedFilter.toString()));
}
#endregion
}
if (mltQueries.getClauses().Any())
{
combinedQuery.add(new BooleanClause(mltQueries, BooleanClause.Occur.SHOULD));
}
// now add in additional weighting data from the candidate's profile
if (!string.IsNullOrEmpty(candidate.DesiredJobTitle))
{
//Boost the DesiredJobTitle above the rest of the terms
var jobTitleExpression =
Expression.Parse(Expression.StripOperatorsAndBrackets(candidate.DesiredJobTitle),
ModificationFlags.AllowShingling);
// First match on title
var boostQuery =
_indexer.GetQuery(new JobAdSearchQuery
{
AdTitle = jobTitleExpression, IncludeSynonyms = true
});
boostQuery.setBoost(1.5F);
titleQueries.add(boostQuery, BooleanClause.Occur.SHOULD);
// Also match general content
//boostQuery = _indexer.GetLuceneQuery(new JobAdSearchQuery {Keywords = jobTitleExpression, IncludeSynonyms = true});
//boostQuery.setBoost(1.3F);
//titleQueries.add(boostQuery, BooleanClause.Occur.SHOULD);
#region Log
if (EventSource.IsEnabled(Event.Trace))
{
EventSource.Raise(Event.Trace, method, "Combined Query #1",
Event.Arg("Query", combinedQuery.toString()));
}
#endregion
}
if (resume.Jobs != null)
{
foreach (var jobTitle in resume.Jobs.Select(j => j.Title).Take(3))
{
if (string.IsNullOrEmpty(jobTitle))
{
continue;
}
var jobTitleExpression = Expression.Parse(Expression.StripOperatorsAndBrackets(jobTitle),
ModificationFlags.AllowShingling);
// First match on title
var boostQuery =
_indexer.GetQuery(new JobAdSearchQuery
{
AdTitle = jobTitleExpression, IncludeSynonyms = true
});
boostQuery.setBoost(1.2F);
titleQueries.add(boostQuery, BooleanClause.Occur.SHOULD);
// Also match general content
//boostQuery = _indexer.GetLuceneQuery(new JobAdSearchQuery { Keywords = jobTitleExpression, IncludeSynonyms = true });
//boostQuery.setBoost(1.1F);
//titleQueries.add(boostQuery, BooleanClause.Occur.SHOULD);
// Also match general content
//boostQuery = _indexer.GetLuceneQuery(new JobAdSearchQuery { Keywords = jobTitleExpression, IncludeSynonyms = true });
//boostQuery.setBoost(1.1F);
//combinedQuery.add(boostQuery, BooleanClause.Occur.SHOULD);
}
}
// now combine the queries
if (mltQueries.getClauses().Any())
{
combinedQuery.add(new BooleanClause(mltQueries, BooleanClause.Occur.SHOULD));
}
if (titleQueries.getClauses().Any())
{
combinedQuery.add(new BooleanClause(titleQueries, BooleanClause.Occur.MUST));
}
#region Log
if (EventSource.IsEnabled(Event.Trace))
{
EventSource.Raise(Event.Trace, method, "Combined Query #2",
Event.Arg("Query", combinedQuery.toString()));
}
#endregion
searchQuery.Salary = candidate.DesiredSalary == null
? null
: candidate.DesiredSalary.Clone();
searchQuery.ExcludeNoSalary = false;
searchQuery.Location = member.Address.Location;
searchQuery.Distance = 50;
searchQuery.JobTypes = candidate.DesiredJobTypes;
searchQuery.Relocations = candidate.RelocationPreference != RelocationPreference.No && candidate.RelocationLocations != null
? candidate.RelocationLocations = candidate.RelocationLocations.ToArray()
: null;
//Add salary, job type, location restriction & (optionally) last run time
var filter = _indexer.GetFilter(searchQuery, null, null);
// combine salary, etc. filter with the excluded job ads
combinedFilter.add(new FilterClause(filter, BooleanClause.Occur.MUST));
// exclude blocked jobs
var excludedIds = _jobAdActivityFiltersQuery.GetExcludeJobAdIds(member, searchQuery);
if (excludedIds != null && excludedIds.Count > 0)
{
combinedFilter.add(new FilterClause(new SpecialsFilter(SearchFieldName.Id, true, excludedIds.Select(id => id.ToFieldValue())), BooleanClause.Occur.MUST));
}
#region Log
if (EventSource.IsEnabled(Event.Trace))
{
EventSource.Raise(Event.Trace, method, "Combined Filter #2",
Event.Arg("Query", combinedFilter.toString()));
}
#endregion
var searchResults = searcher.Search(combinedQuery, combinedFilter, null, null, searchQuery.Skip, searchQuery.Take ?? reader.maxDoc(), false);
#region Log
if (EventSource.IsEnabled(Event.Trace))
{
EventSource.Raise(Event.Trace, method, "MLT Results",
Event.Arg("Results Count", searchResults == null ? 0 : searchResults.JobAdIds.Count));
}
#endregion
return(searchResults);
}
catch (Exception e)
{
#region Log
EventSource.Raise(Event.Error, method, "Unexpected exception.", e);
#endregion
throw;
}
}