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BaseSortableDataProvider.java
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BaseSortableDataProvider.java
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/*
* Copyright (c) 2010-2013 Evolveum
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.evolveum.midpoint.web.component.data;
import com.evolveum.midpoint.model.api.ModelInteractionService;
import com.evolveum.midpoint.model.api.ModelService;
import com.evolveum.midpoint.model.api.TaskService;
import com.evolveum.midpoint.model.api.WorkflowService;
import com.evolveum.midpoint.prism.query.ObjectPaging;
import com.evolveum.midpoint.prism.query.ObjectQuery;
import com.evolveum.midpoint.prism.query.OrderDirection;
import com.evolveum.midpoint.schema.SchemaConstantsGenerated;
import com.evolveum.midpoint.task.api.TaskManager;
import com.evolveum.midpoint.util.logging.Trace;
import com.evolveum.midpoint.util.logging.TraceManager;
import com.evolveum.midpoint.web.page.PageBase;
import com.evolveum.midpoint.web.security.MidPointApplication;
import com.evolveum.midpoint.web.util.WebMiscUtil;
import org.apache.commons.lang.Validate;
import org.apache.wicket.Component;
import org.apache.wicket.extensions.markup.html.repeater.data.sort.SortOrder;
import org.apache.wicket.extensions.markup.html.repeater.util.SortParam;
import org.apache.wicket.extensions.markup.html.repeater.util.SortableDataProvider;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import java.io.Serializable;
import java.util.*;
/**
* @author lazyman
*/
public abstract class BaseSortableDataProvider<T extends Serializable> extends SortableDataProvider<T, String> {
private static final Trace LOGGER = TraceManager.getTrace(BaseSortableDataProvider.class);
private Component component;
private List<T> availableData;
private ObjectQuery query;
// after this amount of time cached size will be removed
// from cache and replaced by new value, time in seconds
private Map<Serializable, CachedSize> cache = new HashMap<Serializable, CachedSize>();
private int cacheCleanupThreshold = 60;
private boolean useCache;
public BaseSortableDataProvider(Component component) {
this(component, false, true);
}
public BaseSortableDataProvider(Component component, boolean useCache) {
this(component, useCache, true);
}
public BaseSortableDataProvider(Component component, boolean useCache, boolean useDefaultSortingField) {
Validate.notNull(component, "Component must not be null.");
this.component = component;
this.useCache = useCache;
if (useDefaultSortingField) {
setSort("name", SortOrder.ASCENDING);
}
}
protected ModelService getModel() {
MidPointApplication application = (MidPointApplication) MidPointApplication.get();
return application.getModel();
}
protected TaskManager getTaskManager() {
MidPointApplication application = (MidPointApplication) MidPointApplication.get();
return application.getTaskManager();
}
protected TaskService getTaskService() {
MidPointApplication application = (MidPointApplication) MidPointApplication.get();
return application.getTaskService();
}
protected ModelInteractionService getModelInteractionService() {
MidPointApplication application = (MidPointApplication) MidPointApplication.get();
return application.getModelInteractionService();
}
protected WorkflowService getWorkflowService() {
MidPointApplication application = (MidPointApplication) MidPointApplication.get();
return application.getWorkflowService();
}
public List<T> getAvailableData() {
if (availableData == null) {
availableData = new ArrayList<T>();
}
return availableData;
}
@Override
public IModel<T> model(T object) {
return new Model<T>(object);
}
protected PageBase getPage() {
if (component instanceof PageBase) {
return (PageBase) component;
}
if (component.getPage() instanceof PageBase) {
return (PageBase) component.getPage();
}
throw new IllegalStateException("Component is not instance of '" + PageBase.class.getName()
+ "' or is not placed on page of that instance.");
}
public ObjectQuery getQuery() {
return query;
}
public void setQuery(ObjectQuery query) {
this.query = query;
}
/**
* Flag method for {@link TablePanel}. If true navigation panel with paging "X to Y from Z results is shown",
* otherwise only "previous and next" simple paging is used.
*
* @return By defaults it returns true.
*/
public boolean isSizeAvailable() {
return true;
}
protected ObjectPaging createPaging(long first, long count) {
SortParam sortParam = getSort();
if (sortParam != null) {
OrderDirection order;
if (sortParam.isAscending()) {
order = OrderDirection.ASCENDING;
} else {
order = OrderDirection.DESCENDING;
}
return ObjectPaging.createPaging(WebMiscUtil.safeLongToInteger(first), WebMiscUtil.safeLongToInteger(count),
(String) sortParam.getProperty(), SchemaConstantsGenerated.NS_COMMON, order);
} else {
return ObjectPaging.createPaging(WebMiscUtil.safeLongToInteger(first), WebMiscUtil.safeLongToInteger(count));
}
}
public void clearCache() {
cache.clear();
getAvailableData().clear();
}
public int getCacheCleanupThreshold() {
return cacheCleanupThreshold;
}
public void setCacheCleanupThreshold(int cacheCleanupThreshold) {
Validate.isTrue(cacheCleanupThreshold > 0, "Cache cleanup threshold must be bigger than zero.");
this.cacheCleanupThreshold = cacheCleanupThreshold;
}
@Override
public Iterator<? extends T> iterator(long first, long count) {
Iterator<? extends T> iterator = internalIterator(first, count);
saveProviderPaging(getQuery(), createPaging(first, count));
return iterator;
}
protected void saveProviderPaging(ObjectQuery query, ObjectPaging paging) {
}
protected abstract Iterator<? extends T> internalIterator(long first, long count);
@Override
public long size() {
LOGGER.trace("begin::size()");
if (!useCache) {
return internalSize();
}
long size;
CachedSize cachedSize = getCachedSize(cache);
if (cachedSize != null) {
long timestamp = cachedSize.getTimestamp();
if (System.currentTimeMillis() - timestamp > cacheCleanupThreshold * 1000) {
//recreate
size = internalSize();
addCachedSize(cache, new CachedSize(size, System.currentTimeMillis()));
} else {
LOGGER.trace("Size returning from cache.");
size = cachedSize.getSize();
}
} else {
//recreate
size = internalSize();
addCachedSize(cache, new CachedSize(size, System.currentTimeMillis()));
}
LOGGER.trace("end::size()");
return size;
}
protected abstract int internalSize();
protected CachedSize getCachedSize(Map<Serializable, CachedSize> cache) {
return cache.get(query);
}
protected void addCachedSize(Map<Serializable, CachedSize> cache, CachedSize newSize) {
cache.put(query, newSize);
}
public static class CachedSize implements Serializable {
private long timestamp;
private long size;
private CachedSize(long size, long timestamp) {
this.size = size;
this.timestamp = timestamp;
}
public long getSize() {
return size;
}
public long getTimestamp() {
return timestamp;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CachedSize that = (CachedSize) o;
if (size != that.size) return false;
if (timestamp != that.timestamp) return false;
return true;
}
@Override
public int hashCode() {
int result = (int) (timestamp ^ (timestamp >>> 32));
result = 31 * result + (int) (size ^ (size >>> 32));
return result;
}
@Override
public String toString() {
return "CachedSize(size=" + size + ", timestamp=" + timestamp + ")";
}
}
}