/
ModelCacheUsingPageFactory.java
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/
ModelCacheUsingPageFactory.java
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package de.invesdwin.nowicket.application.filter.internal;
import javax.annotation.concurrent.ThreadSafe;
import org.apache.commons.lang3.BooleanUtils;
import org.apache.wicket.Component;
import org.apache.wicket.IPageFactory;
import org.apache.wicket.MetaDataKey;
import org.apache.wicket.Page;
import org.apache.wicket.RestartResponseException;
import org.apache.wicket.core.request.handler.PageProvider;
import org.apache.wicket.core.request.handler.RenderPageRequestHandler;
import org.apache.wicket.request.component.IRequestablePage;
import org.apache.wicket.request.mapper.parameter.PageParameters;
import org.slf4j.ext.XLogger.Level;
import de.invesdwin.nowicket.application.IPageFactoryHook;
import de.invesdwin.nowicket.application.PageFactory;
import de.invesdwin.nowicket.application.filter.AWebApplication;
import de.invesdwin.nowicket.generated.guiservice.GuiTasksHolder;
import de.invesdwin.nowicket.util.RequestCycles;
@ThreadSafe
public class ModelCacheUsingPageFactory implements IPageFactory {
public static final MetaDataKey<Boolean> NO_CACHE_KEY = new MetaDataKey<Boolean>() {
};
public static final String NO_CACHE_PARAM = "noCache";
private static final org.slf4j.ext.XLogger LOG = org.slf4j.ext.XLoggerFactory
.getXLogger(ModelCacheUsingPageFactory.class);
private final IPageFactory delegate;
public ModelCacheUsingPageFactory(final IPageFactory delegate) {
this.delegate = delegate;
}
public static <C extends IRequestablePage> C postProcessUsedPage(final Object newModelObject, final C usedPage) {
if (usedPage instanceof Page) {
final Page cUsedPage = (Page) usedPage;
//execute guitasks that were created for the new page on the used page
RequestCycles.setPage(cUsedPage);
if (cUsedPage.getDefaultModelObject() != null && usedPage instanceof IPageFactoryHook) {
final IPageFactoryHook hook = (IPageFactoryHook) usedPage;
hook.onPageModelRefresh(newModelObject);
}
}
return usedPage;
}
@Override
public <C extends IRequestablePage> C newPage(final Class<C> pageClass, final PageParameters parameters) {
final C newPage = delegate.newPage(pageClass, parameters);
final C usedPage = tryPageFactoryCache(newPage);
usedPage.getPageParameters().mergeWith(newPage.getPageParameters()); //update params
return postProcessUsedPage(extractNewModelObject(newPage), usedPage);
}
@Override
public <C extends IRequestablePage> C newPage(final Class<C> pageClass) {
final C newPage = delegate.newPage(pageClass);
final C usedPage = tryPageFactoryCache(newPage);
usedPage.getPageParameters().mergeWith(newPage.getPageParameters()); //update params
return postProcessUsedPage(extractNewModelObject(newPage), usedPage);
}
private Object extractNewModelObject(final IRequestablePage newPage) {
if (newPage instanceof Page) {
final Page cNewPage = (Page) newPage;
return cNewPage.getDefaultModelObject();
} else {
return null;
}
}
private <C extends IRequestablePage> C tryPageFactoryCache(final C newPage) {
final C usedPage = tryPageFactoryCacheInternal(newPage);
/*
* copy gui tasks from the constructor of the newly created page to the cached page instance for execution
*/
if (usedPage != newPage && usedPage instanceof Page && newPage instanceof Page) {
final Page cUsedPage = (Page) usedPage;
final Page cNewPage = (Page) newPage;
GuiTasksHolder.get(cUsedPage).setGuiTasks(GuiTasksHolder.get(cNewPage).getGuiTasks());
}
return usedPage;
}
@SuppressWarnings("unchecked")
private <C extends IRequestablePage> C tryPageFactoryCacheInternal(final C newPage) {
if (newPage instanceof Page) {
final Page cNewPage = (Page) newPage;
if (isCacheDisabledForPage(cNewPage)) {
//copy gui tasks to execute on the new page
GuiTasksHolder.get(cNewPage).setGuiTasks(GuiTasksHolder.get().getGuiTasks());
return newPage;
}
final Object modelObject = cNewPage.getDefaultModelObject();
if (modelObject != null) {
try {
final Page page = PageFactory.get().getRegisteredPage(modelObject);
if (page != null) {
return (C) page;
}
} catch (final Throwable t) {
LOG.catching(Level.WARN, new RuntimeException(
"Not a generated model page or no suitable constructor available, falling back to default created page.",
t));
return newPage;
}
}
}
return newPage;
}
public static boolean isCacheDisabledForPage(final Page newPage) {
if (BooleanUtils.isTrue(newPage.getMetaData(NO_CACHE_KEY))) {
return true;
}
final PageParameters pageParameters = newPage.getPageParameters();
final String noCacheStr = pageParameters.get(NO_CACHE_PARAM).toString();
if (noCacheStr != null) {
final boolean noCache = BooleanUtils.toBoolean(noCacheStr);
if (noCache) {
newPage.setMetaData(NO_CACHE_KEY, true);
}
pageParameters.remove(NO_CACHE_PARAM);
return noCache;
}
return false;
}
@Override
public <C extends IRequestablePage> boolean isBookmarkable(final Class<C> pageClass) {
return delegate.isBookmarkable(pageClass);
}
public static RenderPageRequestHandler onStalePageException() {
final Page page = RequestCycles.getPage();
return onStalePageException(page);
}
public static RenderPageRequestHandler onStalePageException(final Page page) {
if (page == null) {
return null;
}
final PageParameters pageParameters = new PageParameters(page.getPageParameters());
if (!pageParameters.getNamedKeys().contains(NO_CACHE_PARAM)) {
pageParameters.add(NO_CACHE_PARAM, true);
}
final IPageFactory pageFactory = AWebApplication.get().getPageFactory();
final Page newPage = pageFactory.newPage(page.getClass(), pageParameters);
return new RenderPageRequestHandler(new PageProvider(newPage));
}
public static void onNewWindow(final Component component, final Page page) {
if (page == null) {
return;
}
final PageParameters pageParameters = new PageParameters(page.getPageParameters());
if (!pageParameters.getNamedKeys().contains(NO_CACHE_PARAM)) {
pageParameters.add(NO_CACHE_PARAM, true);
}
component.setResponsePage(page.getClass(), pageParameters);
}
public static void onNewWindowRestart(final Component component, final Page page) {
if (page == null) {
return;
}
final PageParameters pageParameters = new PageParameters(page.getPageParameters());
if (!pageParameters.getNamedKeys().contains(NO_CACHE_PARAM)) {
pageParameters.add(NO_CACHE_PARAM, true);
}
throw new RestartResponseException(page.getClass(), pageParameters);
}
}