Server side pagination(using richfaces 4.2.2)
i m override the methods present in the ExtendedDataModel to do true pagination(server side pagination).
Code(PaginationDataModel) :
import java.io.Serializable;
import java.util.ArrayList;
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.logging.Logger;
public class PaginationDataModel extends ExtendedDataModel<HashMap> implements Serializable {
private static final long serialVersionUID = 1L;
ArrayList<HashMap> mDataList = new ArrayList<HashMap>();
HashMap mAnswerMap;
private Integer mRowKey;
public PaginationDataModel(HashMap answerMap) {
super();
mAnswerMap=answerMap;
}
@Override
public void setRowKey(Object o) {
mRowKey = (Integer) o;
}
@Override
public Object getRowKey() {
return mRowKey;
}
@Override
public HashMap getRowData() {
return mDataList.get(mRowKey);
}
@Override
public int getRowIndex() {
return -1;
}
@Override
public Object getWrappedData() {
throw new UnsupportedOperationException();
}
@Override
public boolean isRowAvailable() {
return mRowKey != null;
}
@Override
public void setRowIndex(int arg0) {
throw new UnsupportedOperationException();
}
@Override
public void setWrappedData(Object arg0) {
throw new UnsupportedOperationException();
}
@Override
public int getRowCount() {
String getListCountUrl = mAnswerMap.get("Object::Count::Url").toString();
org.jboss.resteasy.client.ClientRequest clientRequest = new org.jboss.resteasy.client.ClientRequest(getListCountUrl);
org.jboss.resteasy.client.ClientResponse<DataDetail> clientResponse = null;
try {
clientResponse = clientRequest.get(DataDetail.class);
} catch (Exception exception) {
}
mLog.debug(mClassName+ " :: "+methodName+" :: Exited ");
return clientResponse.getEntity(int.class);
}
@Override
public void walk(FacesContext context, DataVisitor visitor, Range range, Object argument) {
final StringBuffer methodName = new StringBuffer("walk");
mLog.debug(mClassName+ " :: "+methodName+" :: Entered ");
SequenceRange sequenceRange = (SequenceRange) range;
try{
if (sequenceRange.getFirstRow() >= 0 && sequenceRange.getRows() > 0) {
String getListUrl = mAnswerMap.get("Object::DataList::Url")+"&startplace="+sequenceRange.getFirstRow()+"&range="+sequenceRange.getRows();
org.jboss.resteasy.client.ClientRequest clientRequest = new org.jboss.resteasy.client.ClientRequest(getListUrl);
org.jboss.resteasy.client.ClientResponse<DataDetail> clientResponse = null;
clientResponse = clientRequest.get(DataDetail.class);
mDataList=clientResponse.getEntity(DataDetail.class).getDataList();
}
for(int index = 0; index < mDataList.size(); index++) {
visitor.process(context,index, argument);
}
}catch (Exception exception) {
}
}
}
ManagedBean(in ViewScope) :
public void getSampleList(String param1,long param2) throws Exception
{
org.jboss.resteasy.client.ClientRequest clientRequest;
QuestionHashMap answerMap=new QuestionHashMap();
try{
String sampleUrl=constants.getValueOf("sampleUrl");
String sampleUrl1=constants.getValueOf("sampleUrl1");
clientRequest = new org.jboss.resteasy.client.ClientRequest(sampleUrl);
clientRequest.queryParameter("param2", param2);
clientRequest.queryParameter("param1", param1);
answerMap.put("Object::DataList::Url",clientRequest.getUri());
clientRequest=new org.jboss.resteasy.client.ClientRequest(sampleUrl11);
clientRequest.queryParameter("param2", param2);
clientRequest.queryParameter("param1", param1);
answerMap.put("Object::Count::Url",clientRequest.getUri());
mDataModel=new PaginationDataModel(answerMap);
this.setDataModel(mDataModel);
}catch (Exception exception) {
}
}
Here the getRowCount() and walk() method is called more number of times.
In which order or how the methods [setRowKey,getRowKey,walk,isRowAvailable,getRowCount,getRowData,getRowIndex,setRowIndex ]
are executed?
Why the getRowCount() and walk() called more number of times?(in my case walk method called 3 times,getRowCount() method called 8 times)
Thanks ,
Sabarinath.
