Refactor ClusterWorkerIdGenerator

infra/common/src/main/java/org/apache/shardingsphere/infra/instance/workerid/WorkerIdGenerator.java

@@ -31,7 +31,7 @@ public interface WorkerIdGenerator {
     /**
      * Generate worker ID.
      *
-     * @param props props
+     * @param props properties
      * @return worker ID
      */
     int generate(Properties props);

mode/type/cluster/core/src/main/java/org/apache/shardingsphere/mode/manager/cluster/coordinator/registry/workerid/generator/ClusterWorkerIdGenerator.java

@@ -28,11 +28,12 @@
 import org.apache.shardingsphere.mode.repository.cluster.exception.ClusterPersistRepositoryException;
 
 import java.util.Collection;
-import java.util.LinkedList;
 import java.util.Optional;
 import java.util.PriorityQueue;
 import java.util.Properties;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
 
 /**
  * Worker ID generator for cluster mode.
@@ -78,18 +79,11 @@ private int generateNewWorkerId() {
     private Optional<Integer> generateAvailableWorkerId() {
         Collection<Integer> assignedWorkerIds = computeNodeStatusService.getAssignedWorkerIds();
         ShardingSpherePreconditions.checkState(assignedWorkerIds.size() <= MAX_WORKER_ID + 1, WorkerIdAssignedException::new);
-        Collection<Integer> availableWorkerIds = new LinkedList<>();
-        for (int i = 0; i < 1024; i++) {
-            availableWorkerIds.add(i);
-        }
-        PriorityQueue<Integer> priorityQueue = new PriorityQueue<>(availableWorkerIds);
-        for (Integer each : assignedWorkerIds) {
-            priorityQueue.remove(each);
-        }
-        Integer preselectedWorkerId = priorityQueue.poll();
-        Preconditions.checkState(null != preselectedWorkerId, "Preselected worker-id can not be null.");
+        PriorityQueue<Integer> availableWorkerIds = IntStream.range(0, 1024).boxed().filter(each -> !assignedWorkerIds.contains(each)).collect(Collectors.toCollection(PriorityQueue::new));
+        Integer preselectedWorkerId = availableWorkerIds.poll();
+        Preconditions.checkNotNull(preselectedWorkerId, "Preselected worker-id can not be null.");
         try {
-            repository.persistExclusiveEphemeral(WorkerIdNode.getWorkerIdGeneratorPath(preselectedWorkerId.toString()), instanceId);
+            repository.persistExclusiveEphemeral(WorkerIdNode.getWorkerIdGeneratorPath(preselectedWorkerId), instanceId);
             return Optional.of(preselectedWorkerId);
         } catch (final ClusterPersistRepositoryException ignore) {
             return Optional.empty();

mode/type/cluster/core/src/main/java/org/apache/shardingsphere/mode/manager/cluster/coordinator/registry/workerid/node/WorkerIdNode.java

@@ -34,7 +34,7 @@ public final class WorkerIdNode {
      * @param workerId worker id
      * @return worker id generator path
      */
-    public static String getWorkerIdGeneratorPath(final String workerId) {
-        return String.join("/", "", ROOT_NODE, workerId);
+    public static String getWorkerIdGeneratorPath(final int workerId) {
+        return String.join("/", "", ROOT_NODE, String.valueOf(workerId));
     }
 }

mode/type/cluster/core/src/test/java/org/apache/shardingsphere/mode/manager/cluster/coordinator/registry/workerid/node/WorkerIdNodeTest.java

@@ -26,6 +26,6 @@ class WorkerIdNodeTest {
 
     @Test
     void assertGetWorkerIdGeneratorPath() {
-        assertThat(WorkerIdNode.getWorkerIdGeneratorPath("1"), is("/worker_id/1"));
+        assertThat(WorkerIdNode.getWorkerIdGeneratorPath(1), is("/worker_id/1"));
     }
 }

mode/type/cluster/repository/api/src/main/java/org/apache/shardingsphere/mode/repository/cluster/ClusterPersistRepository.java

@@ -45,7 +45,7 @@ public interface ClusterPersistRepository extends PersistRepository {
      * Persist exclusive ephemeral data.
      *
      * @param key key of data
-     * @param value is persisted or not
+     * @param value value of data
      */
     void persistExclusiveEphemeral(String key, String value);
 

mode/type/standalone/core/src/test/java/org/apache/shardingsphere/mode/manager/standalone/workerid/generator/StandaloneWorkerIdGeneratorTest.java

@@ -17,6 +17,7 @@
 
 package org.apache.shardingsphere.mode.manager.standalone.workerid.generator;
 
+import org.apache.shardingsphere.infra.instance.workerid.WorkerIdAssignedException;
 import org.apache.shardingsphere.infra.instance.workerid.WorkerIdGenerator;
 import org.apache.shardingsphere.test.util.PropertiesBuilder;
 import org.apache.shardingsphere.test.util.PropertiesBuilder.Property;
@@ -42,6 +43,6 @@ void assertGenerateWithProperties() {
 
     @Test
     void assertGenerateWithInvalidProperties() {
-        assertThrows(IllegalStateException.class, () -> new StandaloneWorkerIdGenerator().generate(PropertiesBuilder.build(new Property(WorkerIdGenerator.WORKER_ID_KEY, "1024"))));
+        assertThrows(WorkerIdAssignedException.class, () -> new StandaloneWorkerIdGenerator().generate(PropertiesBuilder.build(new Property(WorkerIdGenerator.WORKER_ID_KEY, "1024"))));
     }
 }