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package org.apache.james.junit;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

import org.apache.james.util.concurrent.NamedThreadFactory;
import org.junit.jupiter.api.extension.AfterEachCallback;
import org.junit.jupiter.api.extension.BeforeEachCallback;
import org.junit.jupiter.api.extension.ExtensionContext;
import org.junit.jupiter.api.extension.ParameterContext;
import org.junit.jupiter.api.extension.ParameterResolutionException;
import org.junit.jupiter.api.extension.ParameterResolver;

public class ExecutorExtension implements ParameterResolver, BeforeEachCallback, AfterEachCallback {

    private ExecutorService executorService;

    @Override
    public void beforeEach(ExtensionContext context) throws Exception {
        ThreadFactory threadFactory = NamedThreadFactory.withClassName(getClass());
        executorService = Executors.newCachedThreadPool(threadFactory);
    }

    @Override
    public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
        return (parameterContext.getParameter().getType() == ExecutorService.class);
    }

    @Override
    public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
        return executorService;
    }

    @Override
    public void afterEach(ExtensionContext context) throws Exception {
        executorService.shutdownNow();
    }
}