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Spring GenericStrategyResolver\n\n[GenericStrategyResolver][4] makes it possible to 'resolve' generic [Strategy][1] implementations by its generic parameter.\n\nAssume we have some generic strategy:\n\n```java\npublic interface TestStrategy\u003cD extends TestData\u003e {\n   String test(D data);\n}\n``` \nits generic parameter interface:\n```java\npublic interface TestData {\n}\n``` \ntwo implementations of `TestData`:\n```java\n@Value\npublic class FirstData implements TestData {\n   private String first;\n}\n\n@Value\npublic class SecondData implements TestData {\n   private String second;\n}\n```\nand their implementations of `TestStrategy`:\n```java\n@Component\npublic class FirstStrategy implements TestStrategy\u003cFirstData\u003e {\n   @Override\n   public String test(FirstData data) {\n      return data.getFirst();\n   }\n}\n\n@Component\npublic class SecondStrategy implements TestStrategy\u003cSecondData\u003e {\n   @Override\n   public String test(SecondData data) {\n      return data.getSecond();\n   }\n}\n```\nNow if we register `GenericStrategyResolver` bean:\n```java\n@Bean\npublic GenericStrategyResolver\u003cTestStrategy, TestData\u003e resolver(Collection\u003cTestStrategy\u003e strategies) {\n   return new GenericStrategyResolver\u003c\u003e(strategies);\n}\n```\nwe will be able to get a concrete strategy by its generic parameter type:\n```java\n@Component\npublic class TestStrategyContext {\n\n   private final GenericStrategyResolver\u003cTestStrategy, TestData\u003e resolver;\n \n   public TestStrategyContext(GenericStrategyResolver\u003cTestStrategy, TestData\u003e resolver) {\n      this.resolver = resolver;  \n   }\n\n   public Optional\u003cString\u003e test(TestData data) {\n      return resolver.resolve(data.getClass())\n            .map(strategy -\u003e {\n               //noinspection unchecked\n               return strategy.test(data);\n            });\n   }\n}\n```\n\nSee the usage example of `GenericStrategyResolver` in the package [demo][2] - it's a simple\nREST service that takes POST requests with a different data and produces the different responses\nand logging depends on the input data. Requests examples can be found in the [demo.http][3] \n(you can run they right there, if you are using Intellij IDEA).   \n\n[1]: https://en.wikipedia.org/wiki/Strategy_pattern\n[2]: src/main/java/io/github/cepr0/demo\n[3]: demo.http\n[4]: src/main/java/io/github/cepr0/resolver/GenericStrategyResolver.java","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcepr0%2Fsb-generic-strategy-resolver","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fcepr0%2Fsb-generic-strategy-resolver","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fcepr0%2Fsb-generic-strategy-resolver/lists"}