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Copy pathAtomicLongMapTests.java
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54 lines (38 loc) · 1.72 KB
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import com.google.common.util.concurrent.AtomicLongMap;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class AtomicLongMapTests {
private static final String SPRING_COURSE_KEY = "Spring";
private static final String HIBERNATE_COURSE_KEY = "hibernate";
private static final String GUAVA_COURSE_KEY = "Guava";
AtomicLongMap<String> courses = AtomicLongMap.create();
public void setUp() {
courses.put(SPRING_COURSE_KEY, 1056);
courses.put(HIBERNATE_COURSE_KEY, 259);
courses.put(GUAVA_COURSE_KEY, 78);
}
@Test
public void accumulateAndGet_withLongBinaryOperator_thenSuccessful() {
long noOfStudents = 56;
long oldValue = courses.get(SPRING_COURSE_KEY);
long totalNotesRequired = courses.accumulateAndGet("Guava", noOfStudents, (x, y) -> (x * y));
assertEquals(totalNotesRequired, oldValue * noOfStudents);
}
@Test
public void getAndAccumulate_withLongBinaryOperator_thenSuccessful() {
long noOfStudents = 56;
long beforeUpdate = courses.get(SPRING_COURSE_KEY);
long onUpdate = courses.accumulateAndGet("Guava", noOfStudents, (x, y) -> (x * y));
long afterUpdate = courses.get(SPRING_COURSE_KEY);
assertEquals(onUpdate, afterUpdate);
assertEquals(afterUpdate, beforeUpdate * noOfStudents);
}
@Test
public void updateAndGet_withLongUnaryOperator_thenSuccessful() {
long beforeUpdate = courses.get(SPRING_COURSE_KEY);
long onUpdate = courses.updateAndGet("Guava", (x) -> (x / 2));
long afterUpdate = courses.get(SPRING_COURSE_KEY);
assertEquals(onUpdate, afterUpdate);
assertEquals(afterUpdate, beforeUpdate / 2);
}
}