/** {@inheritDoc} */
  @Override
  public void onClose() throws IgniteCheckedException {
    if (data == null)
      // Nothing to close.
      return;

    try {
      U.closeQuiet(data.getStatement());
    } catch (SQLException e) {
      throw new IgniteCheckedException(e);
    }

    U.closeQuiet(data);
  }
  /** @throws IOException If failed. */
  private void initFavicon() throws IOException {
    assert favicon == null;

    InputStream in = getClass().getResourceAsStream("favicon.ico");

    if (in != null) {
      BufferedInputStream bis = new BufferedInputStream(in);

      ByteArrayOutputStream bos = new ByteArrayOutputStream();

      try {
        byte[] buf = new byte[2048];

        while (true) {
          int n = bis.read(buf);

          if (n == -1) break;

          bos.write(buf, 0, n);
        }

        favicon = bos.toByteArray();
      } finally {
        U.closeQuiet(bis);
      }
    }
  }
  /**
   * Loads test configuration.
   *
   * @throws Exception if configuration is unawailable or broken.
   */
  private void loadTestConfiguration() throws Exception {
    assert TEST_CONFIGURATION_FILE.isFile();

    InputStream in = null;

    Properties p = new Properties();

    try {
      in = new FileInputStream(TEST_CONFIGURATION_FILE);

      p.load(in);
    } finally {
      U.closeQuiet(in);
    }

    clientNodes = Integer.parseInt(p.getProperty("client.nodes.count"));
    srvNodes = Integer.parseInt(p.getProperty("server.nodes.count"));
    threadsPerClient = Integer.parseInt(p.getProperty("threads.per.client"));
    cancelRate = Integer.parseInt(p.getProperty("cancel.rate"));
    submitDelay = Long.parseLong(p.getProperty("submit.delay"));

    taskParams =
        new GridJobLoadTestParams(
            Integer.parseInt(p.getProperty("jobs.count")),
            Integer.parseInt(p.getProperty("jobs.test.duration")),
            Integer.parseInt(p.getProperty("jobs.test.completion.delay")),
            Double.parseDouble(p.getProperty("jobs.failure.probability")));
  }
    /** @param workTokDir Token directory (common for multiple nodes). */
    private void cleanupResources(File workTokDir) {
      RandomAccessFile lockFile = null;

      FileLock lock = null;

      try {
        lockFile = new RandomAccessFile(new File(workTokDir, LOCK_FILE_NAME), "rw");

        lock = lockFile.getChannel().lock();

        if (lock != null) processTokenDirectory(workTokDir);
        else if (log.isDebugEnabled())
          log.debug(
              "Token directory is being processed concurrently: " + workTokDir.getAbsolutePath());
      } catch (OverlappingFileLockException ignored) {
        if (log.isDebugEnabled())
          log.debug(
              "Token directory is being processed concurrently: " + workTokDir.getAbsolutePath());
      } catch (FileLockInterruptionException ignored) {
        Thread.currentThread().interrupt();
      } catch (IOException e) {
        U.error(log, "Failed to process directory: " + workTokDir.getAbsolutePath(), e);
      } finally {
        U.releaseQuiet(lock);
        U.closeQuiet(lockFile);
      }
    }
  /** {@inheritDoc} */
  @Override
  public void start() throws IgniteCheckedException {
    IpcSharedMemoryNativeLoader.load(log);

    pid = IpcSharedMemoryUtils.pid();

    if (pid == -1) throw new IpcEndpointBindException("Failed to get PID of the current process.");

    if (size <= 0) throw new IpcEndpointBindException("Space size should be positive: " + size);

    String tokDirPath = this.tokDirPath;

    if (F.isEmpty(tokDirPath)) throw new IpcEndpointBindException("Token directory path is empty.");

    tokDirPath = tokDirPath + '/' + locNodeId.toString() + '-' + IpcSharedMemoryUtils.pid();

    tokDir = U.resolveWorkDirectory(tokDirPath, false);

    if (port <= 0 || port >= 0xffff)
      throw new IpcEndpointBindException("Port value is illegal: " + port);

    try {
      srvSock = new ServerSocket();

      // Always bind to loopback.
      srvSock.bind(new InetSocketAddress("127.0.0.1", port));
    } catch (IOException e) {
      // Although empty socket constructor never throws exception, close it just in case.
      U.closeQuiet(srvSock);

      throw new IpcEndpointBindException(
          "Failed to bind shared memory IPC endpoint (is port already " + "in use?): " + port, e);
    }

    gcWorker = new GcWorker(gridName, "ipc-shmem-gc", log);

    new IgniteThread(gcWorker).start();

    if (log.isInfoEnabled())
      log.info(
          "IPC shared memory server endpoint started [port="
              + port
              + ", tokDir="
              + tokDir.getAbsolutePath()
              + ']');
  }
  /** {@inheritDoc} */
  @Override
  public void close() {
    closed = true;

    U.closeQuiet(srvSock);

    if (gcWorker != null) {
      U.cancel(gcWorker);

      // This method may be called from already interrupted thread.
      // Need to ensure cleaning on close.
      boolean interrupted = Thread.interrupted();

      try {
        U.join(gcWorker);
      } catch (IgniteInterruptedCheckedException e) {
        U.warn(log, "Interrupted when stopping GC worker.", e);
      } finally {
        if (interrupted) Thread.currentThread().interrupt();
      }
    }
  }
  /** @throws IOException If failed. */
  private void initDefaultPage() throws IOException {
    assert dfltPage == null;

    InputStream in = getClass().getResourceAsStream("rest.html");

    if (in != null) {
      LineNumberReader rdr = new LineNumberReader(new InputStreamReader(in));

      try {
        StringBuilder buf = new StringBuilder(2048);

        for (String line = rdr.readLine(); line != null; line = rdr.readLine()) {
          buf.append(line);

          if (!line.endsWith(" ")) buf.append(" ");
        }

        dfltPage = buf.toString();
      } finally {
        U.closeQuiet(rdr);
      }
    }
  }
  /** {@inheritDoc} */
  @Override
  public GridDeployment getDeployment(GridDeploymentMetadata meta) {
    assert meta != null;

    assert ctx.config().isPeerClassLoadingEnabled();

    // Validate metadata.
    assert meta.classLoaderId() != null;
    assert meta.senderNodeId() != null;
    assert meta.sequenceNumber() >= -1;
    assert meta.parentLoader() == null;

    if (log.isDebugEnabled())
      log.debug("Starting to peer-load class based on deployment metadata: " + meta);

    while (true) {
      List<SharedDeployment> depsToCheck = null;

      SharedDeployment dep = null;

      synchronized (mux) {
        // Check obsolete request.
        if (isDeadClassLoader(meta)) return null;

        List<SharedDeployment> deps = cache.get(meta.userVersion());

        if (deps != null) {
          assert !deps.isEmpty();

          for (SharedDeployment d : deps) {
            if (d.hasParticipant(meta.senderNodeId(), meta.classLoaderId())
                || meta.senderNodeId().equals(ctx.localNodeId())) {
              // Done.
              dep = d;

              break;
            }
          }

          if (dep == null) {
            GridTuple2<Boolean, SharedDeployment> redeployCheck = checkRedeploy(meta);

            if (!redeployCheck.get1()) {
              // Checking for redeployment encountered invalid state.
              if (log.isDebugEnabled())
                log.debug("Checking for redeployment encountered invalid state: " + meta);

              return null;
            }

            dep = redeployCheck.get2();

            if (dep == null) {
              // Find existing deployments that need to be checked
              // whether they should be reused for this request.
              for (SharedDeployment d : deps) {
                if (!d.isPendingUndeploy() && !d.isUndeployed()) {
                  if (depsToCheck == null) depsToCheck = new LinkedList<SharedDeployment>();

                  if (log.isDebugEnabled()) log.debug("Adding deployment to check: " + d);

                  depsToCheck.add(d);
                }
              }

              // If no deployment can be reused, create a new one.
              if (depsToCheck == null) {
                dep = createNewDeployment(meta, false);

                deps.add(dep);
              }
            }
          }
        } else {
          GridTuple2<Boolean, SharedDeployment> redeployCheck = checkRedeploy(meta);

          if (!redeployCheck.get1()) {
            // Checking for redeployment encountered invalid state.
            if (log.isDebugEnabled())
              log.debug("Checking for redeployment encountered invalid state: " + meta);

            return null;
          }

          dep = redeployCheck.get2();

          if (dep == null)
            // Create peer class loader.
            dep = createNewDeployment(meta, true);
        }
      }

      if (dep != null) {
        if (log.isDebugEnabled())
          log.debug("Found SHARED or CONTINUOUS deployment after first check: " + dep);

        // Cache the deployed class.
        Class<?> cls = dep.deployedClass(meta.className(), meta.alias());

        if (cls == null) {
          U.warn(
              log,
              "Failed to load peer class (ignore if class got undeployed during preloading) [alias="
                  + meta.alias()
                  + ", dep="
                  + dep
                  + ']');

          return null;
        }

        return dep;
      }

      assert meta.parentLoader() == null;
      assert depsToCheck != null;
      assert !depsToCheck.isEmpty();

      /*
       * Logic below must be performed outside of synchronization
       * because it involves network calls.
       */

      // Check if class can be loaded from existing nodes.
      // In most cases this loop will find something.
      for (SharedDeployment d : depsToCheck) {
        // Load class. Note, that remote node will not load this class.
        // The class will only be loaded on this node.
        Class<?> cls = d.deployedClass(meta.className(), meta.alias());

        if (cls != null) {
          synchronized (mux) {
            if (!d.isUndeployed() && !d.isPendingUndeploy()) {
              if (!addParticipant(d, meta)) return null;

              if (log.isDebugEnabled())
                log.debug(
                    "Acquired deployment after verifying it's availability on "
                        + "existing nodes [depCls="
                        + cls
                        + ", dep="
                        + d
                        + ", meta="
                        + meta
                        + ']');

              return d;
            }
          }
        } else if (log.isDebugEnabled()) {
          log.debug(
              "Deployment cannot be reused (class does not exist on participating nodes) [dep="
                  + d
                  + ", meta="
                  + meta
                  + ']');
        }
      }

      // We are here either because all participant nodes failed
      // or the class indeed should have a separate deployment.
      for (SharedDeployment d : depsToCheck) {
        // Temporary class loader.
        ClassLoader temp =
            new GridDeploymentClassLoader(
                GridUuid.randomUuid(),
                meta.userVersion(),
                meta.deploymentMode(),
                true,
                ctx,
                ctxLdr,
                meta.classLoaderId(),
                meta.senderNodeId(),
                meta.sequenceNumber(),
                comm,
                ctx.config().getNetworkTimeout(),
                log,
                ctx.config().getPeerClassLoadingClassPathExclude(),
                0,
                false);

        String path = U.classNameToResourceName(d.sampleClassName());

        // We check if any random class from existing deployment can be
        // loaded from sender node. If it can, then we reuse existing
        // deployment.
        InputStream rsrcIn = temp.getResourceAsStream(path);

        if (rsrcIn != null) {
          // We don't need the actual stream.
          U.closeQuiet(rsrcIn);

          synchronized (mux) {
            if (d.isUndeployed() || d.isPendingUndeploy()) continue;

            // Add new node prior to loading the class, so we attempt
            // to load the class from the latest node.
            if (!addParticipant(d, meta)) {
              if (log.isDebugEnabled())
                log.debug(
                    "Failed to add participant to deployment "
                        + "[meta="
                        + meta
                        + ", dep="
                        + dep
                        + ']');

              return null;
            }
          }

          Class<?> depCls = d.deployedClass(meta.className(), meta.alias());

          if (depCls == null) {
            U.error(
                log,
                "Failed to peer load class after loading it as a resource [alias="
                    + meta.alias()
                    + ", dep="
                    + dep
                    + ']');

            return null;
          }

          if (log.isDebugEnabled())
            log.debug(
                "Acquired deployment class after verifying other class "
                    + "availability on sender node [depCls="
                    + depCls
                    + ", rndCls="
                    + d.sampleClass()
                    + ", sampleClsName="
                    + d.sampleClassName()
                    + ", meta="
                    + meta
                    + ']');

          return d;
        } else if (log.isDebugEnabled())
          log.debug(
              "Deployment cannot be reused (random class could not be loaded from sender node) [dep="
                  + d
                  + ", meta="
                  + meta
                  + ']');
      }

      synchronized (mux) {
        if (log.isDebugEnabled())
          log.debug(
              "None of the existing class-loaders fit (will try to create a new one): " + meta);

        // Check obsolete request.
        if (isDeadClassLoader(meta)) return null;

        // Check that deployment picture has not changed.
        List<SharedDeployment> deps = cache.get(meta.userVersion());

        if (deps != null) {
          assert !deps.isEmpty();

          boolean retry = false;

          for (SharedDeployment d : deps) {
            // Double check if sender was already added.
            if (d.hasParticipant(meta.senderNodeId(), meta.classLoaderId())) {
              dep = d;

              retry = false;

              break;
            }

            // New deployment was added while outside of synchronization.
            // Need to recheck it again.
            if (!d.isPendingUndeploy() && !d.isUndeployed() && !depsToCheck.contains(d))
              retry = true;
          }

          if (retry) {
            if (log.isDebugEnabled()) log.debug("Retrying due to concurrency issues: " + meta);

            // Outer while loop.
            continue;
          }

          if (dep == null) {
            // No new deployments were added, so we can safely add ours.
            dep = createNewDeployment(meta, false);

            deps.add(dep);

            if (log.isDebugEnabled())
              log.debug(
                  "Adding new deployment within second check [dep=" + dep + ", meta=" + meta + ']');
          }
        } else {
          dep = createNewDeployment(meta, true);

          if (log.isDebugEnabled())
            log.debug(
                "Created new deployment within second check [dep=" + dep + ", meta=" + meta + ']');
        }
      }

      if (dep != null) {
        // Cache the deployed class.
        Class<?> cls = dep.deployedClass(meta.className(), meta.alias());

        if (cls == null) {
          U.warn(
              log,
              "Failed to load peer class (ignore if class got undeployed during preloading) [alias="
                  + meta.alias()
                  + ", dep="
                  + dep
                  + ']');

          return null;
        }
      }

      return dep;
    }
  }
  /** {@inheritDoc} */
  @SuppressWarnings("ErrorNotRethrown")
  @Override
  public IpcEndpoint accept() throws IgniteCheckedException {
    while (!Thread.currentThread().isInterrupted()) {
      Socket sock = null;

      boolean accepted = false;

      try {
        sock = srvSock.accept();

        accepted = true;

        InputStream inputStream = sock.getInputStream();
        ObjectInputStream in = new ObjectInputStream(inputStream);

        ObjectOutputStream out = new ObjectOutputStream(sock.getOutputStream());

        IpcSharedMemorySpace inSpace = null;

        IpcSharedMemorySpace outSpace = null;

        boolean err = true;

        try {
          IpcSharedMemoryInitRequest req = (IpcSharedMemoryInitRequest) in.readObject();

          if (log.isDebugEnabled()) log.debug("Processing request: " + req);

          IgnitePair<String> p = inOutToken(req.pid(), size);

          String file1 = p.get1();
          String file2 = p.get2();

          assert file1 != null;
          assert file2 != null;

          // Create tokens.
          new File(file1).createNewFile();
          new File(file2).createNewFile();

          if (log.isDebugEnabled()) log.debug("Created token files: " + p);

          inSpace = new IpcSharedMemorySpace(file1, req.pid(), pid, size, true, log);

          outSpace = new IpcSharedMemorySpace(file2, pid, req.pid(), size, false, log);

          IpcSharedMemoryClientEndpoint ret =
              new IpcSharedMemoryClientEndpoint(inSpace, outSpace, log);

          out.writeObject(
              new IpcSharedMemoryInitResponse(
                  file2, outSpace.sharedMemoryId(), file1, inSpace.sharedMemoryId(), pid, size));

          err = !in.readBoolean();

          endpoints.add(ret);

          return ret;
        } catch (UnsatisfiedLinkError e) {
          throw IpcSharedMemoryUtils.linkError(e);
        } catch (IOException e) {
          if (log.isDebugEnabled())
            log.debug(
                "Failed to process incoming connection "
                    + "(was connection closed by another party):"
                    + e.getMessage());
        } catch (ClassNotFoundException e) {
          U.error(log, "Failed to process incoming connection.", e);
        } catch (ClassCastException e) {
          String msg =
              "Failed to process incoming connection (most probably, shared memory "
                  + "rest endpoint has been configured by mistake).";

          LT.warn(log, null, msg);

          sendErrorResponse(out, e);
        } catch (IpcOutOfSystemResourcesException e) {
          if (!omitOutOfResourcesWarn) LT.warn(log, null, OUT_OF_RESOURCES_MSG);

          sendErrorResponse(out, e);
        } catch (IgniteCheckedException e) {
          LT.error(log, e, "Failed to process incoming shared memory connection.");

          sendErrorResponse(out, e);
        } finally {
          // Exception has been thrown, need to free system resources.
          if (err) {
            if (inSpace != null) inSpace.forceClose();

            // Safety.
            if (outSpace != null) outSpace.forceClose();
          }
        }
      } catch (IOException e) {
        if (!Thread.currentThread().isInterrupted() && !accepted)
          throw new IgniteCheckedException("Failed to accept incoming connection.", e);

        if (!closed)
          LT.error(
              log, null, "Failed to process incoming shared memory connection: " + e.getMessage());
      } finally {
        U.closeQuiet(sock);
      }
    } // while

    throw new IgniteInterruptedCheckedException("Socket accept was interrupted.");
  }