package com.hazelcast.concurrent.idgen;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.UUID;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IdGenerator;
import com.hazelcast.test.HazelcastParallelClassRunner;
import com.hazelcast.test.HazelcastTestSupport;
import com.hazelcast.test.annotation.QuickTest;
@RunWith(HazelcastParallelClassRunner.class)
@Category(QuickTest.class)
public class IdGeneratorTest extends HazelcastTestSupport {
private HazelcastInstance hz;
@Before
public void setUp() {
hz = createHazelcastInstance();
}
@Test
public void testInit() {
testInit(-1, false, 0);
testInit(0, true, 1);
testInit(1, true, 2);
testInit(10, true, 11);
}
private void testInit(int initialValue, boolean expected, long expectedValue) {
IdGenerator idGenerator = createIdGenerator();
boolean initialized = idGenerator.init(initialValue);
assertEquals(expected, initialized);
long newId = idGenerator.newId();
assertEquals(expectedValue, newId);
}
private IdGenerator createIdGenerator() {
return hz.getIdGenerator("id-" + UUID.randomUUID().toString());
}
@Test
public void testInitWhenAlreadyInitialized() {
IdGenerator idGenerator = createIdGenerator();
long first = idGenerator.newId();
boolean initialized = idGenerator.init(10);
assertFalse(initialized);
long actual = idGenerator.newId();
assertEquals(first + 1, actual);
}
@Test
public void testNewId_withExplicitInit() {
IdGenerator idGenerator =createIdGenerator();
assertTrue(idGenerator.init(10));
long result = idGenerator.newId();
assertEquals(11, result);
}
@Test
public void testNewId_withoutExplictInit() {
IdGenerator idGenerator = createIdGenerator();
long result = idGenerator.newId();
assertEquals(0, result);
}
@Test
public void testGeneratingMultipleBlocks() {
IdGenerator idGenerator = createIdGenerator();
long expected = 0;
for (int k = 0; k < 3 * IdGeneratorProxy.BLOCK_SIZE; k++) {
assertEquals(expected, idGenerator.newId());
expected++;
}
}
@Test
public void testDestroy() {
IdGenerator idGenerator = createIdGenerator();
String id = idGenerator.getName();
idGenerator.newId();
idGenerator.newId();
idGenerator.destroy();
IdGenerator newIdGenerator = hz.getIdGenerator(id);
long actual = newIdGenerator.newId();
assertEquals(0, actual);
}
}