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4.x: Introduces a Eureka-backed Discovery implementation (helidon-io#10554)
* Introduces a Eureka-backed Discovery implementation Signed-off-by: Laird Nelson <laird.nelson@oracle.com> * Squashable commit; incorporating PR feedback Signed-off-by: Laird Nelson <laird.nelson@oracle.com> --------- Signed-off-by: Laird Nelson <laird.nelson@oracle.com>
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‎all/pom.xml‎

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<groupId>io.helidon.discovery</groupId>
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<artifactId>helidon-discovery</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.discovery.providers</groupId>
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<artifactId>helidon-discovery-providers-eureka</artifactId>
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</dependency>
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</dependencies>
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</project>

‎bom/pom.xml‎

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<artifactId>helidon-discovery</artifactId>
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<version>${helidon.version}</version>
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</dependency>
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<dependency>
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<groupId>io.helidon.discovery.providers</groupId>
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<artifactId>helidon-discovery-providers-eureka</artifactId>
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<version>${helidon.version}</version>
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</dependency>
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<!-- Metadata -->
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<dependency>

‎discovery/pom.xml‎

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<modules>
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<module>discovery</module>
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<module>providers</module>
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</modules>
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</project>

‎discovery/providers/eureka/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright (c) 2017, 2025 Oracle and/or its affiliates.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.helidon.discovery.providers</groupId>
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<artifactId>helidon-discovery-providers-project</artifactId>
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<version>4.3.0-SNAPSHOT</version>
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</parent>
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<artifactId>helidon-discovery-providers-eureka</artifactId>
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<name>Helidon Discovery Providers Eureka</name>
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<description>
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Eureka-based Discovery provider
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</description>
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<properties>
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<java.util.logging.config.file>src/test/java/logging.properties</java.util.logging.config.file>
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</properties>
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<dependencies>
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<!-- Compile-scoped dependencies. -->
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<dependency>
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<groupId>io.helidon.builder</groupId>
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<artifactId>helidon-builder-api</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.common</groupId>
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<artifactId>helidon-common</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.common</groupId>
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<artifactId>helidon-common-config</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.common</groupId>
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<artifactId>helidon-common-media-type</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.discovery</groupId>
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<artifactId>helidon-discovery</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.http</groupId>
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<artifactId>helidon-http</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.service</groupId>
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<artifactId>helidon-service-registry</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.webclient</groupId>
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<artifactId>helidon-webclient-api</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.webclient</groupId>
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<artifactId>helidon-webclient-http1</artifactId>
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</dependency>
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<dependency>
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<groupId>jakarta.json</groupId>
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<artifactId>jakarta.json-api</artifactId>
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</dependency>
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<!-- Runtime-scoped dependencies. -->
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<dependency>
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<groupId>io.helidon.http.encoding</groupId>
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<artifactId>helidon-http-encoding-gzip</artifactId>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>io.helidon.http.media</groupId>
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<artifactId>helidon-http-media-jsonp</artifactId>
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<scope>runtime</scope>
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</dependency>
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<!-- Test-scoped dependencies. -->
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<dependency>
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<groupId>io.helidon.config</groupId>
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<artifactId>helidon-config</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>io.helidon.config</groupId>
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<artifactId>helidon-config-yaml</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.hamcrest</groupId>
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<artifactId>hamcrest-core</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<annotationProcessorPaths>
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<path>
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<groupId>io.helidon.builder</groupId>
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<artifactId>helidon-builder-codegen</artifactId>
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<version>${helidon.version}</version>
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</path>
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<path>
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<groupId>io.helidon.codegen</groupId>
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<artifactId>helidon-codegen-apt</artifactId>
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<version>${helidon.version}</version>
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</path>
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<path>
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<groupId>io.helidon.codegen</groupId>
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<artifactId>helidon-codegen-helidon-copyright</artifactId>
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<version>${helidon.version}</version>
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</path>
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<path>
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<groupId>io.helidon.config.metadata</groupId>
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<artifactId>helidon-config-metadata-codegen</artifactId>
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<version>${helidon.version}</version>
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</path>
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<path>
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<groupId>io.helidon.service</groupId>
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<artifactId>helidon-service-codegen</artifactId>
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<version>${helidon.version}</version>
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</path>
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</annotationProcessorPaths>
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</configuration>
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</plugin>
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<plugin>
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<artifactId>maven-surefire-plugin</artifactId>
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<configuration>
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<systemPropertyVariables>
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<java.util.logging.config.file>${java.util.logging.config.file}</java.util.logging.config.file>
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</systemPropertyVariables>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎discovery/providers/eureka/src/main/java/io/helidon/discovery/providers/eureka/CacheConfigBlueprint.java‎

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/*
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* Copyright (c) 2025 Oracle and/or its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.helidon.discovery.providers.eureka;
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import java.time.Duration;
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import io.helidon.builder.api.Option;
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import io.helidon.builder.api.Prototype;
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import io.helidon.builder.api.Prototype.Blueprint;
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/**
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* Prototypical state for the portion of Eureka Discovery configuration related to a local cache of Eureka server
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* information.
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*/
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@Blueprint
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@Prototype.Configured
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interface CacheConfigBlueprint {
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/**
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* Whether the state of the cache should be computed from changes reported by Eureka, or replaced in full; {@code true} by default.
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*
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* @return whether the state of the cache should be computed
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*/
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@Option.Configured("compute-changes")
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@Option.DefaultBoolean(true)
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boolean computeChanges();
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/**
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* Whether to defer immediate cache synchronization; {@code false} by default.
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*
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* @return {@code true} if cache synchronization should be deferred until it is actually needed
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*/
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@Option.Configured("defer-sync")
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@Option.DefaultBoolean(false)
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boolean deferSync();
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/**
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* Whether a local cache of Eureka information is used or not; {@code true} by default.
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*
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* @return {@code true} if the cache should be used
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*/
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@Option.Configured("enabled")
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@Option.DefaultBoolean(true)
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boolean enabled();
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/**
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* The name of the {@link Thread} used to retrieve service information from the Eureka server; "Eureka registry
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* fetch thread" by default.
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*
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* @return the name of the {@link Thread} used to retrieve service information from the Eureka server
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*
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* @see Thread.Builder#name(String)
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*/
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@Option.Configured("fetch-thread-name")
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@Option.Default("Eureka registry fetch thread")
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String fetchThreadName();
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/**
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* The time between retrievals of service information from the Eureka server; 30 seconds by default.
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*
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* @return the time between retrievals of service information from the Eureka server
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*
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* @see Duration#parse(CharSequence)
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*/
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@Option.Configured("sync-interval")
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@Option.Default("PT30S")
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Duration syncInterval();
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}

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