如何在 Quarkus 中使用自定义编码器和解码器？

Posted 2023-02-27

【中文标题】如何在 Quarkus 中使用自定义编码器和解码器？

【英文标题】：How to use custom Encoder and Decoder in Quarkus?

【发布时间】：2020-05-24 19:49:47

【问题描述】：

我有一个 Quarkus 应用程序版本 1.2.0.Final。我有这样的解码器：

public class UuidDecoder implements Decoder.TextStream<UUID>, Decoder, Decoder.Binary<UUID>, Decoder.Text<UUID> 
    public UuidDecoder() 
        System.out.println("OK!");
    

    @Override
    public void init(EndpointConfig config) 

    

    @Override
    public void destroy() 

    

    @Override
    public UUID decode(Reader reader) throws DecodeException, IOException 
        return UUID.fromString(CharStreams.toString(reader));
    

    @Override
    public UUID decode(ByteBuffer bytes) throws DecodeException 
        return UUID.fromString(new String(bytes.array()));
    

    @Override
    public boolean willDecode(ByteBuffer bytes) 
        try 
            UUID.fromString(new String(bytes.array()));
            return true;
         catch (IllegalArgumentException e) 
            return false;
        
    

    @Override
    public UUID decode(String s) throws DecodeException 
        return UUID.fromString(s);
    

    @Override
    public boolean willDecode(String s) 
        try 
            UUID.fromString(s);
            return true;
         catch (IllegalArgumentException e) 
            return false;
        
    

还有这样的 Websocket 端点：

@ServerEndpoint(value = "/api/ws/search/id", decoders = UuidDecoder.class)
public class SearchResource 

    private static final Logger LOGGER = Logger.getLogger(SearchResource.class.getName());

    @OnOpen
    public void onOpen(Session session, @PathParam("id") UUID id) 
        LOGGER.info(String.format("We get an open event! ID: %s", id));
    

但是，由于某种原因，我无法启动我的应用程序。在日志中：

14:14:57,999 INFO  [io.und.web.jsr] UT026003: Adding annotated server endpoint class org.siretch.kafka.entrypoint.SearchResource for path /api/ws/search/id
14:14:58,113 ERROR [io.qua.dev.DevModeMain] Failed to start Quarkus: java.lang.ExceptionInInitializerError
    at java.base/java.lang.J9VMInternals.ensureError(J9VMInternals.java:193)
    at java.base/java.lang.J9VMInternals.recordInitializationFailure(J9VMInternals.java:182)
    at java.base/java.lang.Class.forNameImpl(Native Method)
    at java.base/java.lang.Class.forName(Class.java:417)
    at io.quarkus.runner.RuntimeRunner.run(RuntimeRunner.java:153)
    at io.quarkus.dev.DevModeMain.doStart(DevModeMain.java:178)
    at io.quarkus.dev.DevModeMain.start(DevModeMain.java:96)
    at io.quarkus.dev.DevModeMain.main(DevModeMain.java:67)
Caused by: java.lang.RuntimeException: Failed to start quarkus
    at io.quarkus.runner.ApplicationImpl.<clinit>(ApplicationImpl.zig:390)
    ... 6 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: javax.websocket.DeploymentException: UT003028: Could not find decoder for type class java.util.UUID on method public void org.siretch.kafka.entrypoint.SearchResource.onOpen(javax.websocket.Session,java.util.UUID)
    at io.quarkus.undertow.runtime.UndertowDeploymentRecorder.bootServletContainer(UndertowDeploymentRecorder.java:445)
    at io.quarkus.deployment.steps.UndertowBuildStep$build32.deploy_0(UndertowBuildStep$build32.zig:171)
    at io.quarkus.deployment.steps.UndertowBuildStep$build32.deploy(UndertowBuildStep$build32.zig:196)
    at io.quarkus.runner.ApplicationImpl.<clinit>(ApplicationImpl.zig:376)
    ... 6 more
Caused by: java.lang.RuntimeException: javax.websocket.DeploymentException: UT003028: Could not find decoder for type class java.util.UUID on method public void org.siretch.kafka.entrypoint.SearchResource.onOpen(javax.websocket.Session,java.util.UUID)
    at io.undertow.websockets.jsr.Bootstrap.handleDeployment(Bootstrap.java:101)
    at io.undertow.servlet.core.DeploymentManagerImpl.handleExtensions(DeploymentManagerImpl.java:278)
    at io.undertow.servlet.core.DeploymentManagerImpl.deploy(DeploymentManagerImpl.java:155)
    at io.quarkus.undertow.runtime.UndertowDeploymentRecorder.bootServletContainer(UndertowDeploymentRecorder.java:434)
    ... 9 more
Caused by: javax.websocket.DeploymentException: UT003028: Could not find decoder for type class java.util.UUID on method public void org.siretch.kafka.entrypoint.SearchResource.onOpen(javax.websocket.Session,java.util.UUID)
    at io.undertow.websockets.jsr.annotated.AnnotatedEndpointFactory$BoundPathParameters.<init>(AnnotatedEndpointFactory.java:399)
    at io.undertow.websockets.jsr.annotated.AnnotatedEndpointFactory.createBoundPathParameters(AnnotatedEndpointFactory.java:258)
    at io.undertow.websockets.jsr.annotated.AnnotatedEndpointFactory.create(AnnotatedEndpointFactory.java:100)
    at io.undertow.websockets.jsr.ServerWebSocketContainer.addEndpointInternal(ServerWebSocketContainer.java:681)
    at io.undertow.websockets.jsr.ServerWebSocketContainer.addEndpoint(ServerWebSocketContainer.java:654)
    at io.undertow.websockets.jsr.Bootstrap.handleDeployment(Bootstrap.java:95)
    ... 12 more

14:14:58,114 INFO  [io.qua.dev.DevModeMain] Attempting to start hot replacement endpoint to recover from previous Quarkus startup failure

所以，我的问题是：如何为 URL @PathParam 注册自定义解码器？我认为问题出在io.undertow.websockets.jsr.annotated.AnnotatedEndpointFactory.BoundPathParameters#BoundPathParameters，但我不确定我没有做错什么。

编辑一：我想使用java.util.UUID类。

【参考方案1】：

有两个原因：

添加编码器/解码器时，Quarkus 使用“else if”而不是“if”检查解码器的实现接口；所以你的班级可能不会实现多个解码器或多个编码器。我filed this as an issue和created a pull request 当前实现（意外？）忽略了编码器/解码器列表。我filed this as an issue 和created a pull request