Пример #1
0
  /**
   * overrides the test4 function in TestDriver
   *
   * @return whether test4 has passed
   */
  protected boolean test4() {
    System.out.print("\n  Test 4 exercises some of the internals " + "of the buffer manager\n");

    int index;
    int numPages = NUMBUF + 10;
    Page pg = new Page();
    PageId pid = new PageId();
    PageId[] pids = new PageId[numPages];
    boolean status = OK;

    System.out.print("  - Allocate bunch of pages together \n");

    for (int i = 0; i < numPages / NUMBUF; i++) {
      for (index = i * NUMBUF; status == OK && index < (i + 1) * NUMBUF; ++index) {
        pg = new Page();
        try {
          pid = SystemDefs.JavabaseBM.newPage(pg, 1);
        } catch (Exception e) {
          status = FAIL;
          System.err.print("*** Could not allocate new page number " + index + 1 + "\n");
          e.printStackTrace();
        }

        if (status == OK) {
          pids[index] = pid;
        }

        if (status == OK) {

          // Copy the page number + 99999 onto each page.  It seems
          // unlikely that this bit pattern would show up there by
          // coincidence.
          int data = pid.pid + 99999;

          try {
            Convert.setIntValue(data, 0, pg.getpage());
          } catch (IOException e) {
            System.err.print("*** Convert value failed\n");
            status = FAIL;
            e.printStackTrace();
          }
        }
      }
      for (index = i * NUMBUF; status == OK && index < (i + 1) * NUMBUF; ++index) {
        try {
          SystemDefs.JavabaseBM.unpinPage(pids[index], true);
        } catch (Exception e) {
          status = FAIL;
          System.err.print("*** Could not unpin page " + pids[index].pid + "\n");
          e.printStackTrace();
        }
      }
    }

    if (status == OK) {
      System.out.print("  - Read the pages\n");

      for (int i = 0; i < numPages / NUMBUF; i++) {
        for (index = i * NUMBUF; status == OK && index < (i + 1) * NUMBUF; ++index) {
          pg = new Page();
          pid = pids[index];
          try {
            SystemDefs.JavabaseBM.pinPage(pid, pg, false);
          } catch (Exception e) {
            status = FAIL;
            System.err.print("*** Could not pin page " + pid.pid + "\n");
            e.printStackTrace();
          }

          if (status == OK) {

            int data = 0;

            try {
              data = Convert.getIntValue(0, pg.getpage());
            } catch (IOException e) {
              System.err.print("*** Convert value failed \n");
              status = FAIL;
            }

            if (data != pid.pid + 99999) {
              status = FAIL;
              System.err.print("*** Read wrong data back from page " + pid.pid + "\n");
            }
          }
        }
        for (index = i * NUMBUF; status == OK && index < (i + 1) * NUMBUF; ++index) {
          try {
            SystemDefs.JavabaseBM.unpinPage(pids[index], true);
          } catch (Exception e) {
            status = FAIL;
            System.err.print("*** Could not unpin page " + pids[index].pid + "\n");
            e.printStackTrace();
          }
        }
      }
    }

    if (status == OK) {
      System.out.print("  Test 4 completed successfully.\n");
    }

    return status;
  }
Пример #2
0
  /**
   * overrides the test3 function in TestDriver. It exercises some of the internal of the buffer
   * manager
   *
   * @return whether test3 has passed
   */
  protected boolean test3() {

    System.out.print("\n  Test 3 exercises some of the internals " + "of the buffer manager\n");

    int index;
    int numPages = NUMBUF + 10;
    Page pg = new Page();
    PageId pid = new PageId();
    PageId[] pids = new PageId[numPages];
    boolean status = OK;

    System.out.print(
        "  - Allocate and dirty some new pages, one at " + "a time, and leave some pinned\n");

    for (index = 0; status == OK && index < numPages; ++index) {
      try {
        pid = SystemDefs.JavabaseBM.newPage(pg, 1);
      } catch (Exception e) {
        status = FAIL;
        System.err.print("*** Could not allocate new page number " + index + 1 + "\n");
        e.printStackTrace();
      }

      if (status == OK) pids[index] = pid;

      if (status == OK) {

        // Copy the page number + 99999 onto each page.  It seems
        // unlikely that this bit pattern would show up there by
        // coincidence.
        int data = pid.pid + 99999;

        try {
          Convert.setIntValue(data, 0, pg.getpage());
        } catch (IOException e) {
          System.err.print("*** Convert value failed\n");
          status = FAIL;
          e.printStackTrace();
        }

        // Leave the page pinned if it equals 12 mod 20.  This is a
        // random number based loosely on a bug report.
        if (status == OK) {
          if (pid.pid % 20 != 12) {
            try {
              SystemDefs.JavabaseBM.unpinPage(pid, /*dirty:*/ true);
            } catch (Exception e) {
              status = FAIL;
              System.err.print("*** Could not unpin dirty page " + pid.pid + "\n");
            }
          }
        }
      }
    }

    if (status == OK) {
      System.out.print("  - Read the pages\n");

      for (index = 0; status == OK && index < numPages; ++index) {
        pid = pids[index];
        try {
          SystemDefs.JavabaseBM.pinPage(pid, pg, false);
        } catch (Exception e) {
          status = FAIL;
          System.err.print("*** Could not pin page " + pid.pid + "\n");
          e.printStackTrace();
        }

        if (status == OK) {

          int data = 0;

          try {
            data = Convert.getIntValue(0, pg.getpage());
          } catch (IOException e) {
            System.err.print("*** Convert value failed \n");
            status = FAIL;
          }

          if (data != pid.pid + 99999) {
            status = FAIL;
            System.err.print("*** Read wrong data back from page " + pid.pid + "\n");
          }
        }

        if (status == OK) {
          try {
            SystemDefs.JavabaseBM.unpinPage(pid, true); // might not be dirty
          } catch (Exception e) {
            status = FAIL;
            System.err.print("*** Could not unpin page " + pid.pid + "\n");
            e.printStackTrace();
          }
        }

        if (status == OK && (pid.pid % 20 == 12)) {
          try {
            SystemDefs.JavabaseBM.unpinPage(pid, /*dirty:*/ true);
          } catch (Exception e) {
            status = FAIL;
            System.err.print("*** Could not unpin page " + pid.pid + "\n");
            e.printStackTrace();
          }
        }
      }
    }

    if (status == OK) System.out.print("  Test 3 completed successfully.\n");

    return status;
  }