content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * 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
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.activemq.store.kahadb.disk.index;
  
  import org.apache.activemq.store.kahadb.disk.page.PageFile;
  import org.apache.activemq.store.kahadb.disk.page.Transaction;
  import org.apache.activemq.store.kahadb.disk.util.LongMarshaller;
  import org.apache.activemq.store.kahadb.disk.util.StringMarshaller;
  import org.junit.Test;
  
  import java.io.File;
  import java.util.LinkedList;
  
  public class PageFileTransactionAsyncTest {
  
      @Test(timeout=60000)
      public void testLargeTransactionPageOkForReuse() throws Exception {
  
          int numPagesToExercise = 4000;
  
          PageFile pf = new PageFile(new File("target/test-data"), "PageFileTransactionAsyncTest");
          pf.setEnableWriteThread(true);
          pf.setWriteBatchSize(5000);
          pf.load();
  
          LinkedList<Index> indices = new LinkedList<>();
          for (int i=0; i<numPagesToExercise; i++) {
              indices.add(createIndex(pf));
          }
  
          // large tx
          Transaction tx = pf.tx();
          for (Index i : indices) {
              for (int j=0; j<10; j++) {
                  i.put(tx, key(j), (long) j);
              }
          }
          tx.commit();
  
          // with some of those writes disk bound, exercise again
          for (Index i : indices) {
              tx = pf.tx();
              i.put(tx, key(0), (long)0);
              tx.commit();
          }
  
          // lets see if it is ok!
          pf.flush();
          pf.unload();
          pf.delete();
      }
  
      private String key(int v) {
          return "key:"+v;
      }
  
      protected Index<String, Long> createIndex(PageFile pf) throws Exception {
  
          Transaction tx = pf.tx();
          long id = tx.allocate().getPageId();
  
          BTreeIndex<String, Long> index = new BTreeIndex<String,Long>(pf, id);
          index.setKeyMarshaller(StringMarshaller.INSTANCE);
          index.setValueMarshaller(LongMarshaller.INSTANCE);
          index.load(tx);
          tx.commit();
  
          return index;
      }
  
  }
  