Examples of org.hornetq.core.paging.Page

org.hornetq.core.paging.Page
@see PagingManager @author Clebert Suconic

         }
         else
         {
            numberOfPages--;


            final Page returnPage;


            // We are out of old pages, all that is left now is the current page.
            // On that case we need to replace it by a new empty page, and return the current page immediately
            if (currentPageId == firstPageId)
            {
               firstPageId = Integer.MAX_VALUE;


               if (currentPage == null)
               {
                  // sanity check... it shouldn't happen!
                  throw new IllegalStateException("CurrentPage is null");
               }


               returnPage = currentPage;
               returnPage.close();
               currentPage = null;


               // The current page is empty... which means we reached the end of the pages
               if (returnPage.getNumberOfMessages() == 0)
               {
                  stopPaging();
                  returnPage.open();
                  returnPage.delete();


                  // This will trigger this address to exit the page mode,
                  // and this will make HornetQ start using the journal again
                  return null;
               }

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         fileFactory = storeFactory.newFileFactory(getStoreName());
      }


      SequentialFile file = fileFactory.createSequentialFile(fileName, 1000);


      Page page = new PageImpl(storeName, storageManager, fileFactory, file, pageNumber);


      // To create the file
      file.open();


      file.position(0);

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         }
         else
         {
            numberOfPages--;


            final Page returnPage;


            // We are out of old pages, all that is left now is the current page.
            // On that case we need to replace it by a new empty page, and return the current page immediately
            if (currentPageId == firstPageId)
            {
               firstPageId = Integer.MAX_VALUE;


               if (currentPage == null)
               {
                  // sanity check... it shouldn't happen!
                  throw new IllegalStateException("CurrentPage is null");
               }


               returnPage = currentPage;
               returnPage.close();
               currentPage = null;


               // The current page is empty... which means we reached the end of the pages
               if (returnPage.getNumberOfMessages() == 0)
               {
                  stopPaging();
                  returnPage.open();
                  returnPage.delete(null);


                  // This will trigger this address to exit the page mode,
                  // and this will make HornetQ start using the journal again
                  return null;
               }

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               // Wait every producer to produce at least one message
               latchStart.await();


               while (aliveProducers.get() > 0)
               {
                  Page page = storeImpl.depage();
                  if (page != null)
                  {
                     readPages.add(page);
                  }
               }

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               long msgsRead = 0;


               while (msgsRead < NUMBER_OF_MESSAGES)
               {
                  Page page = storeImpl.depage();
                  if (page != null)
                  {
                     page.open();
                     List<PagedMessage> messages = page.read(new NullStorageManager());


                     for (PagedMessage pgmsg : messages)
                     {
                        ServerMessage msg = pgmsg.getMessage();


                        assertEquals(msgsRead++, msg.getMessageID());


                        assertEquals(msg.getMessageID(), msg.getLongProperty("count").longValue());
                     }


                     page.close();
                     page.delete(null);
                  }
                  else
                  {
                     System.out.println("Depaged!!!! numerOfMessages = " + msgsRead + " of " + NUMBER_OF_MESSAGES);
                     Thread.sleep(500);

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                            PagingTest.PAGE_MAX,
                            new HashMap<String, AddressSettings>());


      server.start();


      Page pg = server.getPagingManager().getPageStore(ADDRESS).getCurrentPage();


      pg.open();


      List<PagedMessage> msgs = pg.read(server.getStorageManager());


      assertTrue(msgs.size() > 0);


      pg.close();


      long queues[] = new long[] { server.locateQueue(new SimpleString("q1")).getID(),
                                  server.locateQueue(new SimpleString("q2")).getID() };


      for (long q : queues)
      {
         for (int i = 0; i < msgs.size(); i++)
         {
            server.getStorageManager().storeCursorAcknowledge(q, new PagePositionImpl(pg.getPageId(), i));
         }
      }


      server.stop();

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            @Override
            public Page createPage(final int page) throws Exception
            {


               Page originalPage = super.createPage(page);


               return new FailingPage(originalPage);
            }

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               // Wait every producer to produce at least one message
               latchStart.await();


               while (aliveProducers.get() > 0)
               {
                  Page page = storeImpl.depage();
                  if (page != null)
                  {
                     readPages.add(page);
                  }
               }

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      Assert.assertEquals(1, storeImpl.getNumberOfPages());


      storeImpl.sync();


      Page page = storeImpl.depage();


      page.open();


      List<PagedMessage> msg = page.read();


      Assert.assertEquals(numMessages, msg.size());
      Assert.assertEquals(1, storeImpl.getNumberOfPages());


      page = storeImpl.depage();

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      int sequence = 0;


      for (int pageNr = 0; pageNr < 2; pageNr++)
      {
         Page page = storeImpl.depage();


         page.open();


         List<PagedMessage> msg = page.read();


         page.close();


         Assert.assertEquals(5, msg.size());


         for (int i = 0; i < 5; i++)
         {
            Assert.assertEquals(sequence++, msg.get(i).getMessage(null).getMessageID());
            UnitTestCase.assertEqualsBuffers(18, buffers.get(pageNr * 5 + i), msg.get(i)
                                                                                 .getMessage(null)
                                                                                 .getBodyBuffer());
         }
      }


      Assert.assertEquals(1, storeImpl.getNumberOfPages());


      Assert.assertTrue(storeImpl.isPaging());


      ServerMessage msg = createMessage(1, storeImpl, destination, buffers.get(0));


      Assert.assertTrue(storeImpl.page(msg));


      Page newPage = storeImpl.depage();


      newPage.open();


      Assert.assertEquals(1, newPage.read().size());


      newPage.delete();


      Assert.assertEquals(1, storeImpl.getNumberOfPages());


      Assert.assertTrue(storeImpl.isPaging());


      Assert.assertNull(storeImpl.depage());


      Assert.assertFalse(storeImpl.isPaging());


      Assert.assertFalse(storeImpl.page(msg));


      storeImpl.startPaging();


      Assert.assertTrue(storeImpl.page(msg));


      Page page = storeImpl.depage();


      page.open();


      List<PagedMessage> msgs = page.read();


      Assert.assertEquals(1, msgs.size());


      Assert.assertEquals(1l, msgs.get(0).getMessage(null).getMessageID());


      UnitTestCase.assertEqualsBuffers(18, buffers.get(0), msgs.get(0).getMessage(null).getBodyBuffer());


      Assert.assertEquals(1, storeImpl.getNumberOfPages());


      Assert.assertTrue(storeImpl.isPaging());


      Assert.assertNull(storeImpl.depage());


      Assert.assertEquals(0, storeImpl.getNumberOfPages());


      page.open();


   }

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