在JavaFX中动态更新TableView时内存泄漏

时间:2015-03-24 21:34:17

标签: java memory-leaks javafx-2 tableview javafx-8

当我在JavaFX项目中动态更新我的表时,我有很多内存泄漏。我有三种方法。按下按钮CreateModel后启动。然后在这个方法的最后,我调用initTable()和initData()init,并将数据放入表中。 当我按下CreateModel几次时,我程序的内存使用量从~100mb增加到250-350mb。当我评论这两种方法时,程序在没有更新表的情况下工作,我没有内存泄漏。

    @FXML
        protected void handleButtonCreateAction(ActionEvent event) throws Throwable {
            processes = Integer.parseInt(textFieldProcesses.getText());
            resources = Integer.parseInt(textFieldResources.getText());

            banker.init(resources, processes, Integer.parseInt(textFieldMaxResourceCount.getText()));
            if(myThread == null) {
                myThread = new MyThread(this, banker);
            } else {
                myThread.stop();
                myThread.finalize();//Bug fix
                myThread = null;
                myThread = new MyThread(this, banker);
            }
            autoModeCheckBox.setSelected(false);
            myThread.setAutoMode(false);
            //TODO: bug when create sleep time from slider is not in Thread


            initColumns();
            initData();
        }

        void initColumns() {
            mainTableView.getColumns().clear();
            mainTableView.getColumns().add(createProcessColumn());
            for (int i = 1; i <= resources; i++) {
                mainTableView.getColumns().add(newResourceColumn(i));
            }
        }

        void initData() {
            tableData = banker.genRows();
            mainTableView.setItems(tableData);

            ObservableList<TableColumn> headerColumnsList = mainTableView.getColumns();
            for(int i = 1; i < headerColumnsList.size(); i++) {
                TableColumn resourceUsageColumn = (TableColumn) headerColumnsList.get(i).getColumns().get(0);
                resourceUsageColumn.setText(String.valueOf(banker.getResourceUsage(i-1)) + "/" + String.valueOf(banker.getResourceCount(i-1)));
            }
        }

        void clearTable() {
            if (tableData != null) {
                tableData.clear();
                //mainTableView.setItems(tableData);
            }
        }

private TableColumn createProcessColumn() {
        TableColumn containerColumn = new TableColumn();//containerColumn

        TableColumn subContainerColumn = new TableColumn();//subContainerColumn

        TableColumn processColumn = new TableColumn("Process");//processColumn
        processColumn.setMinWidth(TABLE_PROCESSES_COLUMN_WIDTH);
        processColumn.setResizable(false);
        processColumn.setSortable(false);

        /*processColumn.setCellValueFactory(new Callback<TableColumn.CellDataFeatures<ObservableList,String>,ObservableValue<String>>() {

            public ObservableValue<String> call(TableColumn.CellDataFeatures<ObservableList, String> param) {
                return new SimpleStringProperty(param.getValue().get(0).toString());//number in param.getValue().get(number) pointed to row number of data in our List
            }

        });*/

        processColumn.setCellFactory(new Callback<TableColumn, TableCell>() { //TODO: If use this type of set CellFactory you can't sort columns

                                         @Override
                                         public TableCell call(TableColumn p) {
                                             return new TableCell() {

                                                 @Override
                                                 public void updateItem(Object item, boolean empty) {
                                                     super.updateItem(item, empty);
                                                     this.setStyle("-fx-background-color:lightgrey");
                                                     if (!isEmpty()) {
                                                         if (!banker.getWorkingProcesses().contains(this.getIndex()))
                                                             this.setStyle("-fx-background-color:darkgray");//if this process finished his work
                                                         setText(tableData.get(this.getIndex()).get(0).toString()); //getIndex return number of this cell in column
                                                     } else {//TODO: Bug fix
                                                         setText(null);
                                                         setStyle(null);
                                                         setEffect(null);
                                                     }
                                                 }

                                             };
                                         }

                                     });

        subContainerColumn.getColumns().add(processColumn);
        containerColumn.getColumns().add(subContainerColumn);
        return containerColumn;
    }

    private TableColumn newResourceColumn(final int index) {
        TableColumn resourceColumn = new TableColumn("Resource" + String.valueOf(index));//resourceColumn

        TableColumn resourceUsageColumn = new TableColumn("-/-");//TODO: rename

        TableColumn allocationColumn = new TableColumn("Alloc");//allocationColumn
        allocationColumn.setMinWidth(TABLE_COLUMN_WIDTH);
        allocationColumn.setPrefWidth(TABLE_COLUMN_WIDTH);
        allocationColumn.setMaxWidth(TABLE_COLUMN_WIDTH);
        allocationColumn.setResizable(false);
        allocationColumn.setSortable(false);
        allocationColumn.setCellFactory(new Callback<TableColumn, TableCell>() {

            @Override
            public TableCell call(TableColumn p) {
                return new TableCell() {

                    @Override
                    public void updateItem(Object item, boolean empty) {
                        super.updateItem(item, empty);
                        if (!isEmpty()) {
                            if (!banker.getWorkingProcesses().contains(this.getIndex())) { //if this process finished his work
                                this.setStyle(TABLE_CELL_FINISHED_COLOR);
                                this.setTextFill(Color.BLACK);
                                this.setEffect(null);
                            }
                            else if ((this.getIndex() == banker.getRequest().getProcess()) && (index == banker.getRequest().getResource()+1)) {//if this cell contained in request
                                this.setStyle(TABLE_ALLOC_CELL_SELECTED_COLOR);
                                this.setTextFill(Color.WHITE);
                                InnerShadow innerShadow = new InnerShadow();
                                innerShadow.setRadius(TABLE_CELL_SHADOW_RADIUS);
                                innerShadow.setColor(Color.gray(0, TABLE_CELL_SHADOW_OPACITY));
                                this.setEffect(innerShadow);
                            }
                            else {//if this cell not contained in request
                                this.setStyle(TABLE_ALLOC_CELL_COLOR);
                                this.setTextFill(Color.BLACK);
                                this.setEffect(null);
                            }
                            setText(tableData.get(this.getIndex()).get(index * 2 - 1).toString()); //getIndex return number of this cell in column
                        } else { //TODO: Bug fix
                            setText(null);
                            setStyle(null);
                            setEffect(null);
                        }
                    }

                };
            }

        });

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