Autumn 2015

TIES456 Introduction to SOA and Cloud Computing, 5 ECTS

TIES532 - Service oriented architectures and cloud computing for developers, 5 ECTS

Today

• Overview of Week 39/40
• Next week’s exercise
• Advanced tasks (TIES532)

Overview Week 39/40

• Accepted : groups 2, 3, 5, and 8
• Minor corrections/show deployment/JMeter: groups 4 and 6
  • Show changes on Thursday
• Major corrections: groups 1, 7, 9, and 10
  • Look trough problems during break

General Feedback - Use of cache - find the problem.

• Creation

            Cache<String, Double> cache = CacheBuilder.newBuilder()
                .maximumSize(10)
                .recordStats()
                .expireAfterWrite((long) 2.5, TimeUnit.MINUTES)
                .build();

• Use

            if ((cache.getIfPresent(country)) != null) {
                return cache.getIfPresent(country);
            } else {
                double val = gdp.getGDP(country)
                cache.put(country, val);
                return val;
            }

General Feedback - Use of cache - find the problem

(will still somehow work correct in this case, but with degraded performance)

• Creation

            Cache<String, Double> cache = CacheBuilder.newBuilder()
                .maximumSize(10)
                .expireAfterWrite(150, TimeUnit.SECONDS)
                .build();

• Use

            Double val = cache.getIfPresent(countryCode);
            if (val != null){
                return val;
            } else {
                val = gdp.getGDP(countryCode);
                cache.put(countryCode, val);
                return val;
            }

General feedback - Use of cache - easiest to get it right

• Creation

            LoadingCache<CountryCode, GDP> cache = CacheBuilder.newBuilder()
                .maximumSize(10)
                .expireAfterAccess(150, TimeUnit.SECONDS)
                .refreshAfterWrite(5, TimeUnit.MINUTES)
                .build(new CacheLoader<CountryCode, GDP>() {
                    @Override
                    public GDP load(CountryCode code) throws Exception {
                        GDP gdp = gdpService.getGDP(code);
                        return gdp;
                    }
                });

• Use

            final GDP gdp = cache.get(countryCode);

Next week’s task

• Merging of groups …
• Authentication using Spring

Advanced assignments [TIES532]

• Mediafire backup
• Bus travel

This week

• Before Thursday
  • Read prerequisite material
• Before Friday (23:59)
  • Make corrections to last week’s exercise
• On Thursdays and Mondays
  • Make the assignment in groups
• Before Monday in two weeks (23:59)
  • Submit assignment using git (tip of master branch) - see task.