[JBoss Seam] - Here is a Richfaces Ajax Datascroler and Seam Example
by supernovasoftware.com
I use the following to view large tables where fetching the all the results is not feasible. It has about 1 million rows.
It does assume that you object implements the interface Idable shown next.
|
| import java.io.IOException;
| import java.io.Serializable;
| import java.util.ArrayList;
| import java.util.HashMap;
| import java.util.List;
| import java.util.Map;
|
| import javax.faces.context.FacesContext;
|
| import org.ajax4jsf.model.DataVisitor;
| import org.ajax4jsf.model.ExtendedDataModel;
| import org.ajax4jsf.model.Range;
| import org.ajax4jsf.model.SequenceRange;
| import org.jboss.seam.ScopeType;
| import org.jboss.seam.annotations.Logger;
| import org.jboss.seam.annotations.Out;
| import org.jboss.seam.log.Log;
|
| import my.package.Idable;
|
| public abstract class BaseExtendedDataModel<T,ID extends Serializable> extends ExtendedDataModel implements BaseExtendedDataModelDAO<T, ID>{
|
| private @Logger Log log;
|
| @Out(scope=ScopeType.CONVERSATION, required=false)
| public List<T> listRow;
|
| private ID currentId;
| private Map<ID, T> wrappedData = new HashMap<ID, T>();
| private List<ID> wrappedKeys;
| private Long rowCount; // better to buffer row count locally
|
| public abstract Long getCount();
| public abstract List<T> getList(Integer firstRow, Integer maxResults);
| public abstract T findById(ID id);
|
| public void wrap(FacesContext context, DataVisitor visitor, Range range, Object argument, List<T> list) throws IOException
| {
| wrappedKeys = new ArrayList<ID>();
| wrappedData = new HashMap<ID, T>();
| for (T row : list)
| {
| Idable idable = (Idable) row;
| ID id = (ID) idable.getId();
| wrappedKeys.add(id);
| wrappedData.put(id, row);
| visitor.process(context, id, argument);
| }
| }
|
| public boolean hasById(ID id)
| {
| for (T row : listRow)
| {
| Idable idable = (Idable) row;
| Long rowId = (Long) idable.getId();
| if (rowId.equals(id))
| {
| return true;
| }
| }
| return false;
| }
|
| @Override
| public void walk(FacesContext context, DataVisitor visitor, Range range, Object argument) throws IOException
| {
| int firstRow = ((SequenceRange) range).getFirstRow();
| int maxResults = ((SequenceRange) range).getRows();
| wrap(context, visitor, range, argument, getList(firstRow, maxResults));
| }
|
| /*
| * This method normally called by Visitor before request Data Row.
| */
| @Override
| public void setRowKey(Object key)
| {
| this.currentId = (ID) key;
| }
|
| @Override
| public int getRowCount()
| {
| if(rowCount == null)
| return (rowCount = this.getCount()).intValue();
| else
| return rowCount.intValue();
| }
|
| @Override
| public boolean isRowAvailable()
| {
| if (currentId == null) {
| return false;
| } else {
| return hasById(currentId);
| }
| }
|
| /**
| * This is main way to obtain data row. It is intensively used by framework.
| * We strongly recommend use of local cache in that method.
| */
| @Override
| public Object getRowData() {
| if (currentId == null) {
| return null;
| } else {
| T ret = wrappedData.get(currentId);
| if (ret == null) {
| ret = this.findById(currentId);
| wrappedData.put(currentId, ret);
| return ret;
| } else {
| return ret;
| }
| }
| }
|
| /**
| * Unused rudiment from old JSF staff.
| */
| @Override public Object getWrappedData() { throw new UnsupportedOperationException(); }
| @Override public int getRowIndex() { throw new UnsupportedOperationException(); }
| @Override public void setRowIndex(int rowIndex) { throw new UnsupportedOperationException(); }
| @Override public void setWrappedData(Object data) { throw new UnsupportedOperationException(); }
|
| /**
| * Unused update data.
| */
| // @Override public void update() { throw new UnsupportedOperationException(); }
|
| /**
| * TODO if this is never called by the framework why is it necessary.
| */
| @Override public Object getRowKey() { if (true) throw new UnsupportedOperationException(); return currentId; }
|
| }
|
| public interface BaseExtendedDataModelDAO<T, ID> {
| |
| | }
|
|
Idable interface
| public interface Idable
| {
| public Long getId();
| }
|
I extend the base class as shown below.
| import java.util.List;
|
| import org.jboss.seam.annotations.In;
| import org.jboss.seam.annotations.Name;
|
| import mypackage.general.access.Access;
|
| @Name("accessExtendedDataModel")
| public class AccessExtendedDataModel extends BaseExtendedDataModel<Access, Long>
| {
| @In(create=true) AccessDAO accessDAO;
|
| @Override
| public Long getCount()
| {
| return accessDAO.getCount();
| }
|
| @Override
| public Access findById(Long id)
| {
| return accessDAO.findById(id);
| }
|
| @Override
| public List<Access> getList(Integer firstRow, Integer maxResults)
| {
| return listRow = accessDAO.getRange(firstRow, maxResults);
| }
|
Then in the facelets page
| <a4j:form>
| <rich:datascroller for="accessList" />
| <rich:spacer height="10" />
| <rich:dataTable id="accessList"
| value="#{accessExtendedDataModel}"
| var="accessL"
| styleClass="f_table"
| rowClasses="tr0,tr1"
| rows="30">
| <rich:column id="id">
| <f:facet name="header">id</f:facet>
| <h:outputText value="#{accessL.id}" />
| </rich:column>
| <rich:column id="User">
| <f:facet name="header">User</f:facet>
| <h:outputText value="#{accessL.usr.usr}" />
| </rich:column>
| </rich:dataTable>
| </a4j:form>
|
The scroller is now connected to the datatable. This is a first pass and was adapted for an example in the Richfaces cvs I took a while back.
The paging is all done with Ajax and only 30 objects are loaded at a time.
Any suggestions for improvement are most welcome.
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18 years, 4 months
[JBoss jBPM] - Re: jbpm variables not saved
by apdo
I continue my experimentation and here is my obervations.
using the following method to display the form I am able to set variable values. the form is open with these value however only the description is saved when submiting the form. I think it is more a seam issue or probably misunderstanding. I will probably post something related to this in the seam forum. I think we can consider this discussion close in the context of jbpm.
thanks,
@StartTask
public String displayForm() {
org.jboss.seam.bpm.BusinessProcess process = org.jboss.seam.bpm.BusinessProcess.instance();
org.jbpm.graph.exe.ProcessInstance pinstance = org.jboss.seam.bpm.ProcessInstance.instance();
org.jboss.seam.bpm.TaskInstance.instance().setVariable("variable1", "my comments");
pinstance.getContextInstance().createVariable("summary", "sum value");
System.out.println("APD displayForm called");
return "/todoform.xhtml";
}
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18 years, 4 months
[JBoss jBPM] - Process Definition XML Validation Problems
by caleb.powell＠intelliware.c
Hi,
we are trying to parse a very simple process definition xml file. We are using the following environment:
-jbpm 3.2.2ga
-XercesImpl 2.2.1 paser on the Classpath
-Java 1.4.2_13
When we attempt to load the xml, the validation is failing. We suspect that there is nothing wrong with our xml file, and in fact, the problem lies with the xsd. This is the xml we are trying to parse:
<process-definition xmlns="urn:jbpm.org:jpdl-3.2">
| <start-state>
| <transition to='s' />
| </start-state>
| <state name='s'>
| <transition to='end' />
| </state>
| <end-state name='end' />
| </process-definition>
We get the following exception from jBPM:
anonymous wrote : org.jbpm.jpdl.JpdlException: [[ERROR] line 366: cos-ct-extends.1.4.2.2.2.2.1: Error for type '#AnonType_assignment'. The content type of a derived type and that of its base must both be mixed or element-only., [ERROR] line 1: cvc-complex-type.4: Attribute 'name' must appear on element 'process-definition'.]
| at org.jbpm.jpdl.xml.JpdlXmlReader.readProcessDefinition(JpdlXmlReader.java:172)
| at org.jbpm.graph.def.ProcessDefinition.parseXmlString(ProcessDefinition.java:151)
We've seen this problem posted before with no responses. Does anyone know why this is happening? Is it a problem with the xsd or are we doing something wrong?
Thanks,
Caleb
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18 years, 4 months