Finish caching support for ScoreServer

[welchr]

Most of the code for caching score statistic segments has been implemented, but it needs to be finished/tested.

For now, the server seems to be "fast enough" for the small regions/numbers of genes we're handling. It may become more necessary however as testing on real data continues.

Relevant parts:

LDServer/core/src/ScoreServer.cpp

Line 192 in 9a94a7d

//string segment_key = make_segment_cache_key(genotype_dataset_id, phenotype_dataset_id, phenotype, samples_name, segment->get_chromosome(), segment->get_start_bp(), segment->get_stop_bp());

LDServer/core/src/ScoreServer.cpp

Lines 91 to 102 in 9a94a7d

	string ScoreServer::make_segment_cache_key(uint32_t genotype_dataset_id, uint32_t phenotype_dataset_id, const string& phenotype_name, const string& samples_name, const string& chromosome, uint64_t start_bp, uint64_t stop_bp) {
	stringstream os(ios::binary | ios::out);
	os.write(reinterpret_cast<const char*>(&genotype_dataset_id), sizeof(genotype_dataset_id));
	os.write(reinterpret_cast<const char*>(&phenotype_dataset_id), sizeof(phenotype_dataset_id));
	os.write(phenotype_name.c_str(), phenotype_name.size());
	os.write(samples_name.c_str(), samples_name.size());
	os.write(chromosome.c_str(), chromosome.size());
	os.write(reinterpret_cast<const char*>(&start_bp), sizeof(start_bp));
	os.write(reinterpret_cast<const char*>(&stop_bp), sizeof(stop_bp));
	os.flush();
	return os.str();
	}