Micronaut Integration

Design

Micronaut is a microservice framework for building moudlar applications. This develops a configuration that bests works with Micronaut.

Auto-Configuration

Application yaml configuration.

example config

ignite: 
	enabled: true
	clients:
		default:
			path: "classpath:a.cfg"         
		other:            
			path: "classpath:b.cfg"

default is the primary bean
path loads in a spring bean definition

Ignite factory configuration

A bean for an IgniteConfiguration can be provided from a factory.

Example:

@Factory
public class MyFactory {
    @Singleton
    @Bean
    @Primary
    @Named("default")
    IgniteConfiguration defaultConfiguration() {
        IgniteConfiguration cfg = new IgniteConfiguration();

        // The node will be started as a client node.
        cfg.setClientMode(true);
        // Setting up an IP Finder to ensure the client can locate the servers.
        TcpDiscoveryMulticastIpFinder ipFinder = new TcpDiscoveryMulticastIpFinder();
        ipFinder.setAddresses(Collections.singletonList("localhost:47500..47509"));
        cfg.setDiscoverySpi(new TcpDiscoverySpi().setIpFinder(ipFinder));
        return cfg;
    }
}

Micronaut Ignite Cache

Micronaut cache is covered under snapshot documentation. By default the primary Ignite instance is used for Micronaut cache and the key from for each cache operation will refer to the IgniteCache instance.

IgniteCacheManager

@Singleton
public class IgniteCacheManager implements DynamicCacheManager<IgniteCache> {
    private final Ignite ignite;
    private final ConversionService<?> service;
    private final ExecutorService executorService;

    public IgniteCacheManager(@Primary Ignite ignite,
                              ConversionService<?> service,
                              @Named(TaskExecutors.IO) ExecutorService executorService) {
        this.ignite = ignite;
        this.service = service;
        this.executorService = executorService;
    }

    @NonNull
    @Override
    public SyncCache<IgniteCache> getCache(String name) {
        return new IgniteSyncCache(service, ignite.getOrCreateCache(name), executorService);
    }
}

Example

This is an example of a service using Micronaut Cache.

Example Cacheable Object

  	@Singleton
    @CacheConfig('counter')
    static class CounterService {
        Map<String, Integer> counters = new LinkedHashMap<>()
        Map<String, Integer> counters2 = new LinkedHashMap<>()

        int incrementNoCache(String name) {
            int value = counters.computeIfAbsent(name, { 0 })
            counters.put(name, ++value)
            return value
        }

        @CachePut
        int increment(String name) {
            int value = counters.computeIfAbsent(name, { 0 })
            counters.put(name, ++value)
            return value
        }

        @PutOperations([
                @CachePut('counter'),
                @CachePut('counter2')

        ])
        int increment2(String name) {
            int value = counters2.computeIfAbsent(name, { 0 })
            counters2.put(name, ++value)
            return value
        }

        @Cacheable
        CompletableFuture<Integer> futureValue(String name) {
            return CompletableFuture.completedFuture(counters.computeIfAbsent(name, { 0 }))
        }

        @Cacheable
        @SingleResult
        Flowable<Integer> flowableValue(String name) {
            return Flowable.just(counters.computeIfAbsent(name, { 0 }))
        }

        @Cacheable
        Single<Integer> singleValue(String name) {
            return Single.just(counters.computeIfAbsent(name, { 0 }))
        }

        @CachePut
        CompletableFuture<Integer> futureIncrement(String name) {
            int value = counters.computeIfAbsent(name, { 0 })
            counters.put(name, ++value)
            return CompletableFuture.completedFuture(value)
        }

        @Cacheable
        int getValue(String name) {
            return counters.computeIfAbsent(name, { 0 })
        }

        @Cacheable('counter2')
        int getValue2(String name) {
            return counters2.computeIfAbsent(name, { 0 })
        }

        @Cacheable
        Optional<Integer> getOptionalValue(String name) {
            return Optional.ofNullable(counters.get(name))
        }

        @CacheInvalidate(all = true)
        void reset() {
            counters.clear()
        }

        @CacheInvalidate
        void reset(String name) {
            counters.remove(name)
        }

        @InvalidateOperations([
                @CacheInvalidate('counter'),
                @CacheInvalidate('counter2')
        ])
        void reset2(String name) {
            counters.remove(name)
        }

        @CacheInvalidate(parameters = 'name')
        void set(String name, int val) {
            counters.put(name, val)
        }
    }

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