Тузиков Александр, ИТМО DWS, Stage 1

src/main/java/ru/vk/itmo/test/tuzikovalexandr/Server.java

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+package ru.vk.itmo.test.tuzikovalexandr;
+
+import ru.vk.itmo.ServiceConfig;
+import ru.vk.itmo.dao.Config;
+import ru.vk.itmo.dao.Dao;
+import ru.vk.itmo.test.reference.dao.ReferenceDao;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.util.List;
+
+public final class Server {
+
+    private Server() {
+
+    }
+
+    public static void main(String[] args) throws IOException {
+        long flushThresholdBytes = 1024 * 1024;
+        Dao dao = new ReferenceDao(new Config(Files.createTempDirectory("data"), flushThresholdBytes));
+        ServerImpl server = new ServerImpl(new ServiceConfig(
+                8080, "http://localhost",
+                List.of("http://localhost"),
+                Files.createTempDirectory("data")
+        ), dao);
+        server.start();
+    }
+}

src/main/java/ru/vk/itmo/test/tuzikovalexandr/ServerImpl.java

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+package ru.vk.itmo.test.tuzikovalexandr;
+
+import one.nio.http.HttpException;
+import one.nio.http.HttpServer;
+import one.nio.http.HttpServerConfig;
+import one.nio.http.HttpSession;
+import one.nio.http.Param;
+import one.nio.http.Path;
+import one.nio.http.Request;
+import one.nio.http.RequestMethod;
+import one.nio.http.Response;
+import one.nio.server.AcceptorConfig;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import ru.vk.itmo.ServiceConfig;
+import ru.vk.itmo.dao.BaseEntry;
+import ru.vk.itmo.dao.Dao;
+import ru.vk.itmo.dao.Entry;
+
+import java.io.IOException;
+import java.lang.foreign.MemorySegment;
+import java.lang.foreign.ValueLayout;
+import java.nio.charset.StandardCharsets;
+import java.util.Set;
+
+public class ServerImpl extends HttpServer {
+
+    private final Dao dao;
+    private static final Logger log = LoggerFactory.getLogger(ServerImpl.class);
+    private static final Set<Integer> METHODS = Set.of(
+            Request.METHOD_GET, Request.METHOD_PUT, Request.METHOD_DELETE
+    );
+
+    public ServerImpl(ServiceConfig config, Dao dao) throws IOException {
+        super(createServerConfig(config));
+        this.dao = dao;
+    }
+
+    private static HttpServerConfig createServerConfig(ServiceConfig serviceConfig) {
+        HttpServerConfig serverConfig = new HttpServerConfig();
+        AcceptorConfig acceptorConfig = new AcceptorConfig();
+        acceptorConfig.port = serviceConfig.selfPort();
+        acceptorConfig.reusePort = true;
+
+        serverConfig.acceptors = new AcceptorConfig[] {acceptorConfig};
+        serverConfig.closeSessions = true;
+        return serverConfig;
+    }
+
+    @Override
+    public void handleDefault(Request request, HttpSession session) throws IOException {
+        Response response;
+        if (METHODS.contains(request.getMethod())) {
+            response = new Response(Response.BAD_REQUEST, Response.EMPTY);
+        } else {
+            response = new Response(Response.METHOD_NOT_ALLOWED, Response.EMPTY);
+        }
+        session.sendResponse(response);
+    }
+
+    @Override
+    public void handleRequest(Request request, HttpSession session) throws IOException {
+        try {
+            super.handleRequest(request, session);
+        } catch (Exception e) {
+            if (e.getClass() == HttpException.class) {
+                session.sendResponse(new Response(Response.BAD_REQUEST, Response.EMPTY));
+            } else {
+                log.error("Exception during handleRequest: ", e);
+                session.sendResponse(new Response(Response.INTERNAL_ERROR, Response.EMPTY));
+            }
+        }
+    }
+
+    @Path(value = "/v0/status")
+    public Response status() {
+        return Response.ok("OK");
+    }
+
+    @Path(value = "/v0/entity")
+    @RequestMethod(Request.METHOD_GET)
+    public Response getEntry(@Param(value = "id", required = true) String id) {
+        if (id.isEmpty() || id.isBlank()) {
+            return new Response(Response.BAD_REQUEST, Response.EMPTY);
+        }
+
+        MemorySegment key = fromString(id);
+        Entry<MemorySegment> entry = dao.get(key);
+
+        if (entry == null) {
+            return new Response(Response.NOT_FOUND, Response.EMPTY);
+        }
+
+        return new Response(Response.OK, entry.value().toArray(ValueLayout.JAVA_BYTE));
+    }
+
+    @Path(value = "/v0/entity")
+    @RequestMethod(Request.METHOD_PUT)
+    public Response putEntry(@Param(value = "id", required = true) String id, Request request) {
+        if (id.isEmpty() || id.isBlank() || request.getBody() == null) {
+            return new Response(Response.BAD_REQUEST, Response.EMPTY);
+        }
+
+        MemorySegment key = fromString(id);
+        MemorySegment value = MemorySegment.ofArray(request.getBody());
+
+        dao.upsert(new BaseEntry<>(key, value));
+        return new Response(Response.CREATED, Response.EMPTY);
+    }
+
+    @Path(value = "/v0/entity")
+    @RequestMethod(Request.METHOD_DELETE)
+    public Response deleteEntry(@Param(value = "id", required = true) String id) {
+        if (id.isEmpty() || id.isBlank()) {
+            return new Response(Response.BAD_REQUEST, Response.EMPTY);
+        }
+
+        MemorySegment key = fromString(id);
+        dao.upsert(new BaseEntry<>(key, null));
+
+        return new Response(Response.ACCEPTED, Response.EMPTY);
+    }
+
+    private MemorySegment fromString(String data) {
+        return data == null ? null : MemorySegment.ofArray(data.getBytes(StandardCharsets.UTF_8));
+    }
+}

src/main/java/ru/vk/itmo/test/tuzikovalexandr/ServiceImpl.java

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+package ru.vk.itmo.test.tuzikovalexandr;
+
+import ru.vk.itmo.Service;
+import ru.vk.itmo.ServiceConfig;
+import ru.vk.itmo.dao.Config;
+import ru.vk.itmo.dao.Dao;
+import ru.vk.itmo.test.ServiceFactory;
+import ru.vk.itmo.test.reference.dao.ReferenceDao;
+
+import java.io.IOException;
+import java.util.concurrent.CompletableFuture;
+
+public class ServiceImpl implements Service {
+
+    private final ServiceConfig config;
+    private ServerImpl server;
+    private Dao dao;
+
+    public ServiceImpl(ServiceConfig config) {
+        this.config = config;
+    }
+
+    @Override
+    public CompletableFuture<Void> start() throws IOException {
+        dao = new ReferenceDao(new Config(config.workingDir(), 1024 * 1024));
+        server = new ServerImpl(config, dao);
+        server.start();
+        return CompletableFuture.completedFuture(null);
+    }
+
+    @Override
+    public CompletableFuture<Void> stop() throws IOException {
+        server.stop();
+        dao.close();
+        return CompletableFuture.completedFuture(null);
+    }
+
+    @ServiceFactory(stage = 1)
+    public static class Factory implements ServiceFactory.Factory {
+
+        @Override
+        public Service create(ServiceConfig config) {
+            return new ServiceImpl(config);
+        }
+    }
+}