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   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
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   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
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   * See the License for the specific language governing permissions and
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  package org.apache.activemq.artemis.tests.unit.core.persistence.impl;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrowsExactly;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.activemq.artemis.api.core.ActiveMQBuffer;
  import org.apache.activemq.artemis.api.core.ActiveMQBuffers;
  import org.apache.activemq.artemis.core.io.nio.NIOSequentialFileFactory;
  import org.apache.activemq.artemis.core.journal.Journal;
  import org.apache.activemq.artemis.core.journal.PreparedTransactionInfo;
  import org.apache.activemq.artemis.core.journal.RecordInfo;
  import org.apache.activemq.artemis.core.journal.impl.JournalImpl;
  import org.apache.activemq.artemis.core.persistence.StorageManager;
  import org.apache.activemq.artemis.core.persistence.impl.journal.BatchingIDGenerator;
  import org.apache.activemq.artemis.core.persistence.impl.journal.JournalRecordIds;
  import org.apache.activemq.artemis.core.persistence.impl.nullpm.NullStorageManager;
  import org.apache.activemq.artemis.tests.util.ActiveMQTestBase;
  import org.junit.jupiter.api.Test;
  
  public class BatchIDGeneratorUnitTest extends ActiveMQTestBase {
  
     @Test
     public void testSequence() throws Exception {
        NIOSequentialFileFactory factory = new NIOSequentialFileFactory(new File(getTestDir()), 1);
        Journal journal = new JournalImpl(10 * 1024, 2, 2, 0, 0, factory, "activemq-bindings", "bindings", 1);
  
        journal.start();
  
        journal.load(new ArrayList<>(), new ArrayList<>(), null);
  
        BatchingIDGenerator batch = new BatchingIDGenerator(0, 1000, getJournalStorageManager(journal));
        long id1 = batch.generateID();
        long id2 = batch.generateID();
  
        assertTrue(id2 > id1);
  
        journal.stop();
        batch = new BatchingIDGenerator(0, 1000, getJournalStorageManager(journal));
        loadIDs(journal, batch);
  
        long id3 = batch.generateID();
  
        assertEquals(1001, id3);
  
        long id4 = batch.generateID();
  
        assertTrue(id4 > id3 && id4 < 2000);
  
        batch.stop();
        journal.stop();
        validateStoppedGenerator(batch);
        batch = new BatchingIDGenerator(0, 1000, getJournalStorageManager(journal));
        loadIDs(journal, batch);
  
        long id5 = batch.generateID();
        assertTrue(id5 > id4 && id5 < 2000);
  
        long lastId = id5;
  
        boolean close = true;
        for (int i = 0; i < 100000; i++) {
           if (i % 1000 == 0) {
              // interchanging closes and simulated crashes
              if (close) {
                 batch.persistCurrentID();
              }
  
              close = !close;
  
              journal.stop();
              batch = new BatchingIDGenerator(0, 1000, getJournalStorageManager(journal));
              loadIDs(journal, batch);
           }
  
           long id = batch.generateID();
  
           assertTrue(id > lastId);
  
           lastId = id;
        }
  
        batch.stop();
        journal.stop();
        validateStoppedGenerator(batch);
        batch = new BatchingIDGenerator(0, 1000, getJournalStorageManager(journal));
        loadIDs(journal, batch);
  
        lastId = batch.getCurrentID();
  
        journal.stop();
        batch = new BatchingIDGenerator(0, 1000, getJournalStorageManager(journal));
        loadIDs(journal, batch);
  
        assertEquals(lastId, batch.getCurrentID(), "No Ids were generated, so the currentID was supposed to stay the same");
  
        journal.stop();
  
     }
  
     private void validateStoppedGenerator(BatchingIDGenerator stoppedGenerator) {
        assertThrowsExactly(RuntimeException.class, stoppedGenerator::generateID);
     }
  
     protected void loadIDs(final Journal journal, final BatchingIDGenerator batch) throws Exception {
        List<RecordInfo> records = new ArrayList<>();
        List<PreparedTransactionInfo> tx = new ArrayList<>();
  
        journal.start();
        journal.load(records, tx, null);
  
        assertEquals(0, tx.size());
  
        assertFalse(records.isEmpty(), "Contains " + records.size());
  
        for (RecordInfo record : records) {
           if (record.userRecordType == JournalRecordIds.ID_COUNTER_RECORD) {
              ActiveMQBuffer buffer = ActiveMQBuffers.wrappedBuffer(record.data);
              batch.loadState(record.id, buffer);
           }
        }
     }
  
     private StorageManager getJournalStorageManager(final Journal bindingsJournal) {
        NullStorageManager storageManager = new NullStorageManager() {
           @Override
           public synchronized void storeID(long journalID, long id) throws Exception {
              bindingsJournal.appendAddRecord(journalID, JournalRecordIds.ID_COUNTER_RECORD, BatchingIDGenerator.createIDEncodingSupport(id), true);
           }
        };
  
        try {
           storageManager.start();
        } catch (Throwable ignored) {
        }
  
        return storageManager;
     }
  }
  