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update, rename class

This commit is contained in:
@hangga 2023-11-01 11:01:27 +07:00
parent da886b27b3
commit 579f35981e
2 changed files with 3 additions and 63 deletions
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60
core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDLongGeneratorUnitTest.java
View File

@ -1,60 +0,0 @@
package com.baeldung.uuid;
import org.apache.log4j.Logger;
import org.junit.jupiter.api.Test;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.DecimalFormat;
import java.util.HashSet;
import java.util.Set;
import static org.assertj.core.api.Assertions.assertThat;
public class UUIDLongGeneratorUnitTest {
private final static int n = 1000000;
private final static double COLLISION_THRESHOLD = 0.001;
private static final Logger logger = Logger.getLogger(UUIDLongGeneratorUnitTest.class);
private final UUIDPositiveLongGenerator uuidLongGenerator = new UUIDPositiveLongGenerator();
@Test
void whenForeachGenerateLongValue_thenCollisionsCheck() throws InvocationTargetException, IllegalAccessException {
printTableHeader();
for (Method method : uuidLongGenerator.getClass().getDeclaredMethods()) {
collisionAndNegativeCheck(method);
}
}
private void printTableHeader() {
logger.info(String.format("%-30s %-15s %-15s %-15s %-15s%n", "Approach", "collisions", "negatives", "collision", "negative"));
logger.info(String.format("%-30s %-15s %-15s %-15s %-15s%n", "(method name)", "count", "count", "probability", "probability"));
System.out.println("--------------------------------------------------------------------------------------------");
}
private void printOutput(String method, int collisionsCount, int negativeCount, double collisionsProbability, double negativeProbability) {
DecimalFormat decimalFormat = new DecimalFormat("#.#####");
logger.info(String.format("%-30s %-15s %-15s %-15s %-15s", method, collisionsCount, negativeCount, decimalFormat.format(collisionsProbability), decimalFormat.format(negativeProbability)));
}
private void collisionAndNegativeCheck(Method method) throws InvocationTargetException, IllegalAccessException {
Set<Long> uniqueValues = new HashSet<>();
int collisions = 0;
int negative = 0;
for (int i = 0; i < n; i++) {
long uniqueValue = (long) method.invoke(uuidLongGenerator);
if (!uniqueValues.add(uniqueValue)) {
collisions++;
}
if (uniqueValue < 0) {
negative++;
}
}
double collisionsProbability = (double) collisions / n;
double negativeProbability = (double) negative / n;
printOutput(method.getName(), collisions, negative, collisionsProbability, negativeProbability);
assertThat(collisionsProbability).isLessThan(COLLISION_THRESHOLD);
}
}

6
core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDPositiveLongGeneratorUnitTest.java
View File

@ -14,6 +14,7 @@ import static org.assertj.core.api.Assertions.assertThat;
public class UUIDPositiveLongGeneratorUnitTest { public class UUIDPositiveLongGeneratorUnitTest {
private final static int n = 1000000; private final static int n = 1000000;
private final static double COLLISION_THRESHOLD = 0.001;
private final UUIDPositiveLongGenerator uuidLongGenerator = new UUIDPositiveLongGenerator(); private final UUIDPositiveLongGenerator uuidLongGenerator = new UUIDPositiveLongGenerator();
private final Logger logger = LoggerFactory.getLogger(UUIDPositiveLongGeneratorUnitTest.class); private final Logger logger = LoggerFactory.getLogger(UUIDPositiveLongGeneratorUnitTest.class);
@ -34,8 +35,7 @@ public class UUIDPositiveLongGeneratorUnitTest {
private void printOutput(String method, int collisionsCount, int negativeCount, double collisionsProbability, double negativeProbability) { private void printOutput(String method, int collisionsCount, int negativeCount, double collisionsProbability, double negativeProbability) {
DecimalFormat decimalFormat = new DecimalFormat("#.#####"); DecimalFormat decimalFormat = new DecimalFormat("#.#####");
//logger.info(String.format("%-30s %-15s %-15s %-15s %-15s", method, collisionsCount, negativeCount, decimalFormat.format(collisionsProbability), decimalFormat.format(negativeProbability))); logger.info(String.format("%-30s %-15s %-15s %-15s %-15s", method, collisionsCount, negativeCount, decimalFormat.format(collisionsProbability), decimalFormat.format(negativeProbability)));
logger.info("%-30s{} %-15s{} %-15s{} %-15s{} %-15s{}", method, collisionsCount, negativeCount, decimalFormat.format(collisionsProbability), decimalFormat.format(negativeProbability));
} }
@ -55,6 +55,6 @@ public class UUIDPositiveLongGeneratorUnitTest {
double collisionsProbability = (double) collisions / n; double collisionsProbability = (double) collisions / n;
double negativeProbability = (double) negative / n; double negativeProbability = (double) negative / n;
printOutput(method.getName(), collisions, negative, collisionsProbability, negativeProbability); printOutput(method.getName(), collisions, negative, collisionsProbability, negativeProbability);
assertThat(collisionsProbability).isLessThan(0.001); assertThat(collisionsProbability).isLessThan(COLLISION_THRESHOLD);
} }
} }