Java 中的超快微服务： 当Microstream遇上Open Liberty

1. <dependency>
2. <groupId>one.microstream</groupId>
3. <artifactId>microstream-integrations-cdi</artifactId>
4. <version>LAST_VERSION_HERE</version>
5. </dependency>

1.public class Product {  
2.    private final long id;  
3.    private final String name;  
4.    private final String description;  
5.    private final int rating;  
6.  
7.    @JsonbCreator  
8.    public Product(  
9.            @JsonbProperty("id") final long id,  
10.            @JsonbProperty("name") final String name,  
11.            @JsonbProperty("description") final String description,  
12.            @JsonbProperty("rating") final int rating  
13.    ) {  
14.        this.id = id;  
15.        this.name = name;  
16.        this.description = description;  
17.        this.rating = rating;  
18.    }

1.import java.util.Collections;  
2.import java.util.HashSet;  
3.import java.util.Objects;  
4.import java.util.Optional;  
5.import java.util.Set;  
6.import java.util.function.Predicate;  
7.  
8.import one.microstream.integrations.cdi.types.Storage;  
9.  
10.  
11.@Storage  
12.public class Inventory {  
13.    private final Set<Product> products = new HashSet<>();  
14.  
15.    public void add(final Product product) {  
16.        Objects.requireNonNull(product, "product is required");  
17.        this.products.add(product);  
18.    }  
19.  
20.    public Set<Product> getProducts() {  
21.        return Collections.unmodifiableSet(this.products);  
22.    }  
23.  
24.    public Optional<Product> findById(final long id) {  
25.        return this.products.stream().filter(this.isIdEquals(id)).limit(1).findFirst();  
26.    }  
27.  
28.    public void deleteById(final long id) {  
29.        this.products.removeIf(this.isIdEquals(id));  
30.  
31.    }  
32.  
33.    private Predicate<Product> isIdEquals(final long id) {  
34.        return p -> p.getId() == id;  
35.    }  
36.  
37.    @Override  
38.    public boolean equals(Object o) {  
39.        if (this == o) return true;  
40.        if (o == null || getClass() != o.getClass()) return false;  
41.        Inventory inventory = (Inventory) o;  
42.        return Objects.equals(products, inventory.products);  
43.    }  
44.  
45.    @Override  
46.    public int hashCode() {  
47.        return Objects.hash(products);  
48.    }  
49.  
50.    @Override  
51.    public String toString() {  
52.        return "Inventory{" +  
53.                "products=" + products +  
54.                '}';  
55.    }  
}

1.public interface ProductRepository  
2.{  
3.    Collection<Product> getAll();  
4.      
5.    Product save(Product item);  
6.      
7.    Optional<Product> findById(long id);  
8.      
9.    void deleteById(long id);  
10.}  
11.  
12.  
13.@ApplicationScoped  
14.public class ProductRepositoryStorage implements ProductRepository {  
15.    private static final Logger LOGGER = Logger.getLogger(ProductRepositoryStorage.class.getName());  
16.  
17.    @Inject  
18.    private Inventory inventory;  
19.      
20.    @Override  
21.    public Collection<Product> getAll() {  
22.        return this.inventory.getProducts();  
23.    }  
24.  
25.    @Override  
26.    @Store  
27.    public Product save(final Product item) {  
28.        this.inventory.add(item);  
29.        return item;  
30.    }  
31.  
32.    @Override  
33.    public Optional<Product> findById(final long id) {  
34.        LOGGER.info("Finding the item by id: " + id);  
35.        return this.inventory.findById(id);  
36.    }  
37.  
38.    @Override  
39.    @Store  
40.    public void deleteById(final long id) {  
41.        this.inventory.deleteById(id);  
42.    }  
}

1.@RequestScoped  
2.@Path("products")  
3.@Consumes(MediaType.APPLICATION_JSON)  
4.@Produces(MediaType.APPLICATION_JSON)  
5.public class ProductController  
6.{  
7.    @Inject  
8.    private ProductRepository repository;  
9.      
10.    // TODO don't worried about pagination  
11.    @GET  
12.    @Operation(summary = "Get all products", description = "Returns all available items at the restaurant")  
13.    @APIResponse(responseCode = "500", description = "Server unavailable")  
14.    @APIResponse(responseCode = "200", description = "The products")  
15.    @Tag(name = "BETA", description = "This API is currently in beta state")  
16.    @APIResponse(description = "The products", responseCode = "200", content = @Content(mediaType = MediaType.APPLICATION_JSON, schema = @Schema(implementation = Collection.class, readOnly = true, description = "the products", required = true, name = "products")))  
17.    public Collection<Product> getAll()  
18.    {  
19.        return this.repository.getAll();  
20.    }  
21.      
22.    @GET  
23.    @Path("{id}")  
24.    @Operation(summary = "Find a product by id", description = "Find a product by id")  
25.    @APIResponse(responseCode = "200", description = "The product")  
26.    @APIResponse(responseCode = "404", description = "When the id does not exist")  
27.    @APIResponse(responseCode = "500", description = "Server unavailable")  
28.    @Tag(name = "BETA", description = "This API is currently in beta state")  
29.    @APIResponse(description = "The product", content = @Content(mediaType = MediaType.APPLICATION_JSON, schema = @Schema(implementation = Product.class)))  
30.    public Product findById(  
31.        @Parameter(description = "The item ID", required = true, example = "1", schema = @Schema(type = SchemaType.INTEGER)) @PathParam("id") final long id)  
32.    {  
33.        return this.repository.findById(id).orElseThrow(  
34.            () -> new WebApplicationException("There is no product with the id " + id, Response.Status.NOT_FOUND));  
35.    }  
36.      
37.    @POST  
38.    @Operation(summary = "Insert a product", description = "Insert a product")  
39.    @APIResponse(responseCode = "201", description = "When creates an product")  
40.    @APIResponse(responseCode = "500", description = "Server unavailable")  
41.    @Tag(name = "BETA", description = "This API is currently in beta state")  
42.    public Response insert(  
43.        @RequestBody(description = "Create a new product.", content = @Content(mediaType = "application/json", schema = @Schema(implementation = Product.class))) final Product product)  
44.    {  
45.        return Response.status(Response.Status.CREATED).entity(this.repository.save(product)).build();  
46.    }  
47.      
48.    @DELETE  
49.    @Path("{id}")  
50.    @Operation(summary = "Delete a product by ID", description = "Delete a product by ID")  
51.    @APIResponse(responseCode = "200", description = "When deletes the product")  
52.    @APIResponse(responseCode = "500", description = "Server unavailable")  
53.    @Tag(name = "BETA", description = "This API is currently in beta state")  
54.    public Response delete(  
55.        @Parameter(description = "The item ID", required = true, example = "1", schema = @Schema(type = SchemaType.INTEGER)) @PathParam("id") final long id)  
56.    {  
57.        this.repository.deleteById(id);  
58.        return Response.status(Response.Status.NO_CONTENT).build();  
59.    }  
60.      
}

1.mvn clean package  
2.java -jar target/openliberty-example.jar  
3.  
4.curl --location --request POST 'http://localhost:8080/products/' \  
5.--header 'Content-Type: application/json' \  
6.--data-raw '{"id": 1, "name": "banana", "description": "a fruit", "rating": 5}'  
7.  
8.curl --location --request POST 'http://localhost:8080/products/' \  
9.--header 'Content-Type: application/json' \  
10.--data-raw '{"id": 2, "name": "watermelon", "description": "watermelon sugar ahh", "rating": 4}'  
11.  
12.curl --location --request GET 'http://localhost:8080/products/'  
13.  
curl --location --request GET 'http://localhost:8080/products/1'