Primefaces Lazytable，将一个Bean用于不同的过滤标准

Question

我有一个Bean，它为不同的实体返回"Notes"。例如，我可以有报价、客户、发票等的票据。

我不想为不同的实体创建多个Bean，而是希望有一个Bean为每个实体返回正确的Notes。我已经在JSF页面中向bean发送了两个信息"entityType"one_answers"objectId"。有了这两个参数，我可以在bean 中过滤我的数据表

目前我有以下代码，在这个例子中是"OFFER"：

<?xml version="1.0" encoding="UTF-8"?>
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:p="http://primefaces.org/ui"
    xmlns:fn="http://java.sun.com/jsp/jstl/functions"
    xmlns:pe="http://primefaces.org/ui/extensions"
    template="/WEB-INF/layout/portal/template.xhtml"
    xmlns:o="http://omnifaces.org/ui"
    xmlns:of="http://omnifaces.org/functions">
    <ui:define name="head" />
    <ui:define name="title">Page</ui:define>
    <ui:define name="content">

        <p:growl id="growl" showDetail="false" sticky="false" life="3000" />
        <div class="ui-g">
            <div class="ui-g-12">
                <div class="card card-w-title">

                    <p:tabView id="offerTab" dynamic="true" cache="false"
                        widgetVar="tabPanel">

                        <p:tab id="note"
                            disabled="#{offerEditController.modeOffer eq 'ADD'}">
                            <f:facet name="title">
                                <i class="fa fa-sticky-note Fs12 MarRight40"></i>
                                <h:outputText value=" Notizen" />
                            </f:facet>
                            <div class="EmptyBox10"></div>

                            <p:outputPanel id="notePanel">
                                <div class="ui-g ui-fluid">

                                    <div class="ui-g-12 ui-lg-5">
                                        <h:form id="noteForm"
                                            rendered="#{noteRequestByObjectController.init('OFFER', offerEditController.offer.id, offerEditController.offer.idHash)}">

                                            <p:dataTable id="noteListDatatable"
                                                value="#{noteRequestByObjectController.lazyModel}"
                                                var="note" widgetVar="noteTable" resizableColumns="false"
                                                multiViewState="false" selectionMode="single"
                                                selection="#{noteRequestByObjectController.selectedNote}"
                                                filteredValue="#{noteRequestByObjectController.filteredNote}"
                                                rows="50" pageLinks="10" paginatorPosition="bottom"
                                                lazy="true" paginator="true" reflow="true"
                                                currentPageReportTemplate="(Eintrag: {startRecord}-{endRecord} von {totalRecords}, Seite: {currentPage} von {totalPages})"
                                                paginatorTemplate="{CurrentPageReport}  {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
                                                rowsPerPageTemplate="50,100,200"
                                                paginatorAlwaysVisible="false"
                                                emptyMessage="Kein Eintrag gefunden">

                                                <f:facet name="header">
                                                    <p:outputPanel id="functionalityPanel"
                                                        style="float:left; margin-top: -3px">
                                                        <p:commandButton value="Neu hinzufügen"
                                                            styleClass="green-btn White" icon="fa fa-plus-circle"
                                                            actionListener="#{noteRequestByObjectController.doCreateNew}"
                                                            update=":offerTab:noteForm:noteListDatatable, :offerTab:addNoteForm"
                                                            resetValues="true" ajax="true">
                                                        </p:commandButton>
                                                    </p:outputPanel>
                                                    <h:outputText id="overviewText"
                                                        value="Übersicht (#{noteRequestByObjectController.numberTotal})" />
                                                    <p:tooltip for="overviewText" position="top"
                                                        value="Die Gesamtzahl der Filterung" />

                                                </f:facet>

                                                <p:ajax event="rowSelect" ajax="true" immediate="true"
                                                    resetValues="true"
                                                    listener="#{noteRequestByObjectController.onSelectNote}"
                                                    update=":offerTab:noteForm, :offerTab:addNoteForm" />

                                                <p:column sortBy="#{note.createDate}" visible="true">
                                                    <f:facet name="header">
                                                        <h:outputText value="Create" />
                                                    </f:facet>

                                                        <h:outputText id="createDateInfo"
                                                            style="margin-left: 5px;" value="#{note.createDate}"
                                                            styleClass="Fright">
                                                            <f:converter converterId="prettyTimeCustomConverter" />
                                                        </h:outputText>

                                                </p:column>
                                            </p:dataTable>
                                        </h:form>
                                    </div>
                                </div>
                            </p:outputPanel>
                            <div class="EmptyBox20"></div>
                        </p:tab>
                    </p:tabView>
                </div>
            </div>
        </div>

    </ui:define>

我的憨豆：-包含init函数和从数据库加载Notes的函数：

   @ViewScoped
@Named
public class NoteRequestByObjectController extends LazyDataModel<Note>
        implements SelectableDataModel<Note>, Serializable {
    private static final long serialVersionUID = 2815796004558360299L;
    private final Logger LOGGER = LoggerFactory.getLogger(NoteRequestByObjectController.class);
    @EJB
    private NoteService noteService;
    @Inject
    private LoginBean loginBean;
    private List<Note> filteredNote;
    private List<Note> selectedNoteList = new ArrayList<Note>();
    private LazyDataModel<Note> lazyModel;
    private List<Note> list;
    private Note selectedNote;
    private List<Boolean> toogleList;
    private List<ObjectForSearchList> searchList = new ArrayList<ObjectForSearchList>();
    private int numberTotal = 0;
    public enum ModeNote {
        EDIT, ADD
    };
    private ModeNote mode;
    private String entityType;
    private String visibleType;
    private Long objectId;
    private String objectIdHash;
    private boolean startLoad = false;
    /**
     * Init
     */
    public boolean init(String currentEntityType, Long currentObjectId, String currentObjectIdHash) {
        try {
            entityType = currentEntityType;
            objectId = currentObjectId;
            objectIdHash = currentObjectIdHash;
            if (objectId == null || objectIdHash == null)
                return true;
            lazyModel = null;
            // SearchList
            initSearchList();
            findNote();
            selectedNote = new Note();
            mode = ModeNote.ADD;
            startLoad = true;
            LOGGER.info("END init");
            return true;
        }
        catch (Exception e) {
            LOGGER.error(ExceptionUtils.getFullStackTrace(e));
        }
        return false;
    }
    /**
     * Die eigentliche Suche
     */
    public void findNote() {
        LOGGER.info("START findNote");
        lazyModel = null;
        if (lazyModel == null) {
            lazyModel = new LazyDataModel<Note>() {
                @Override
                public List<Note> load(int startingAt, int maxPerPage, String sortField, SortOrder sortOrder,
                        Map<String, Object> filters) {
                    try {
                        list = noteService.findAllNoteLazyLoading(searchList, startingAt, maxPerPage, sortField,
                                sortOrder, filters);
                        numberTotal = noteService.countNoteRowsLazyLoading(searchList);
                        lazyModel.setRowCount(numberTotal);
                    } catch (NoteNotFoundException e) {
                        lazyModel.setRowCount(0);
                        numberTotal = 0;
                    } catch (Exception e) {
                        lazyModel.setRowCount(0);
                        numberTotal = 0;
                    }
                    return list;
                }
                @Override
                public Note getRowData(String rowKey) {
                    if (list != null && !list.isEmpty())
                        for (Note note : list) {
                            String s = "Note [id=" + note.getId() + "]";
                            if (s.equals(rowKey))
                                return note;
                        }
                    return null;
                }
                @Override
                public Object getRowKey(Note note) {
                    return note;
                }
            };
        }
    }

代码正在工作，我为每个不同的实体和他的ID获得了该对象的正确Notes。

但我的问题是，如果我在日志中查看的话。init((函数正在调用多次。对于这种情况，是否有任何可能的解决方案来避免每个实体(客户、报价、发票等(都有许多Bean

非常感谢

Answer 1

表单的rendered属性上有init方法，因此每次JSF评估表单是否需要渲染时，都会调用init方法。

您可以将init方法放在viewAction中，类似于以下内容：

<f:view ....>
    <f:metadata>
        <f:viewAction action="#{noteRequestByObjectController.init('OFFER', offerEditController.offer.id, offerEditController.offer.idHash)}"/>
    </f:metadata>