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package scala.tools.testing;
import org.junit.ClassRule;
import org.junit.rules.TestRule;
import org.junit.runners.model.Statement;
import java.io.Closeable;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Extend this class to use JUnit's @ClassRule. This annotation only works on static methods,
* which cannot be written in Scala.
*
* Example: {@link scala.tools.nsc.backend.jvm.opt.InlinerTest}
*/
public class ClearAfterClass {
private static Map<Class<?>, Map<String, Object>> cache = new ConcurrentHashMap<>();
@ClassRule
public static TestRule clearClassCache() {
return (statement, desc) -> new Statement() {
@Override
public void evaluate() throws Throwable {
ConcurrentHashMap<String, Object> perClassCache = new ConcurrentHashMap<>();
cache.put(desc.getTestClass(), perClassCache);
try {
statement.evaluate();
} finally {
perClassCache.values().forEach(ClearAfterClass::closeIfClosable);
cache.remove(desc.getTestClass());
}
}
};
}
private static void closeIfClosable(Object o) {
if (o instanceof Closeable) {
try {
((Closeable) o).close();
} catch (IOException e) {
// ignore
}
}
}
@SuppressWarnings("unchecked")
public <T> T cached(String key, scala.Function0<T> t) {
Map<String, Object> perClassCache = cache.get(getClass());
return (T) perClassCache.computeIfAbsent(key, s -> t.apply());
}
}
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