public static IEnumerable <T> Take <T>(this IEnumerable <T> items, IPagingRequest paging)
{
if (items == null)
{
return(items);
}
return(items.Skip((paging.PageIndex - 1) * paging.PageSize).Take(paging.PageSize));
}
public static IQueryable <T> Paging <T>(this IQueryable <T> source, object obj)
{
IPagingRequest p = obj as IPagingRequest;
if (p != null)
{
return(source.Skip(p.PageIndex * p.PageSize).Take(p.PageSize));
}
return(source);
}
public virtual void Populate()
{
var localRequest = new Object();
lock (currentRequestLock)
{
currentRequest = localRequest;
}
if (GuiThreadHelper.IsInGuiThread())
{
IFilterDescriptor filterDescriptor = GetFilterDescriptor();
IList <ISortDescriptor> sortDescriptors = GetSortDescriptors();
IPagingRequest pagingRequest = GetPagingRequest();
Object[] contextInformation = GetContextInformation();
Model.IsBusy = true;
ThreadPool.Queue((GenericViewModel <T> model) =>
{
CacheContext.ExecuteWithCache <Object>(CacheProvider.GetCurrentCache(), delegate()
{
ConfigureCacheWithEagerLoads(Cache);
PopulateAsync(model, filterDescriptor, sortDescriptors, pagingRequest, contextInformation, Cache, localRequest);
return(null);
});
}, Model);
}
else
{
IFilterDescriptor filterDescriptor = null;
IList <ISortDescriptor> sortDescriptors = null;
IPagingRequest pagingRequest = null;
Object[] contextInformation = null;
GuiThreadHelper.InvokeInGuiAndWait(delegate()
{
filterDescriptor = GetFilterDescriptor();
sortDescriptors = GetSortDescriptors();
pagingRequest = GetPagingRequest();
contextInformation = GetContextInformation();
Model.IsBusy = true;
});
CacheContext.ExecuteWithCache <Object>(CacheProvider.GetCurrentCache(), delegate()
{
ConfigureCacheWithEagerLoads(Cache);
PopulateAsync(Model, filterDescriptor, sortDescriptors, pagingRequest, contextInformation, Cache, localRequest);
return(null);
});
}
}
public PagingService(DbContext _db, IPagingRequest value, string tableName = "")
{
TableName = string.IsNullOrWhiteSpace(tableName) ? typeof(T).Name : tableName;
db = _db;
#region 缓存每张表的列，用于检测orderby的合法性
if (!Columns.ContainsKey(tableName))
{
Columns[tableName] = typeof(T).GetProperties().Select(x => x.Name).ToList();
}
#endregion
this.value = value;
}
/// <summary>
/// 如果PageIndex小于1视为1，如果PageSize大于100视为100。
/// </summary>
/// <param name="request"></param>
public static void PagingTrim(this IPagingRequest request)
{
if (request == null)
{
return;
}
if (request.PageIndex < 1)
{
request.PageIndex = 1;
}
if (request.PageSize > 100)
{
request.PageSize = 100;
}
}
public abstract IPagingResponse Populate(IFilterDescriptor filterDescriptor, IList <ISortDescriptor> sortDescriptors, IPagingRequest pagingRequest, params Object[] contextInformation);
public virtual IPagingResponse Refresh(IList <IDataChangeEntry> itemsToRefresh, IFilterDescriptor filterDescriptor, IList <ISortDescriptor> sortDescriptors, IPagingRequest pagingRequest, params Object[] contextInformation)
{
return(Populate(filterDescriptor, sortDescriptors, pagingRequest, contextInformation));
}
public PagedList(IQueryable <T> source, IPagingRequest request)
: this(source, request.Page, request.PageSize)
{
}
public static IQueryable <T> Paging <T>(this IQueryable <T> source, IPagingRequest pagingRequest)
{
return(source.Skip(pagingRequest.PageIndex * pagingRequest.PageSize).Take(pagingRequest.PageSize));
}
public static IPagedList <TEntity> GetAllPagedByGuid <TEntity>(this IPagingRepository <TEntity> repository, IPagingRequest request)
where TEntity : BaseEntityWithGuidKey
{
return(repository.FindWithPaging(request, x => x.Id));
}
public static IPagedList <TestEntity> Create(IList <TestEntity> entities = null, IPagingRequest request = null)
{
entities = entities ?? CreateEntities();
request = request ?? new PagingRequest();
return(entities.AsQueryable().ToPagedList(request));
}
public TestablePagedList(IQueryable <TestEntity> source, IPagingRequest request) : base(source, request)
{
}
protected virtual void PopulateAsync(GenericViewModel <T> model, IFilterDescriptor filterDescriptor, IList <ISortDescriptor> sortDescriptors, IPagingRequest pagingRequest, Object[] contextInformation, ICache cache, Object localRequest)
{
lock (currentRequestLock)
{
// Early check here, but more important check in the finally-SyncContext.
// We will not update the ViewModel, if this request is not the current request (hence Populate was recalled
// since this request was initiated).
// An example where this is important would be a screen, where the user can enter search criteria and start
// a corresponding search, while the screen is still loading data from a preceeding request. In this case, the
// result of the second search could be retrieved before the first one, leading to wrong data in the screen.
//
// ToDo: Is there a scenario where the same VMDCC is used with multiple VMs or different Caches?
// If so, localRequest and currentRequest must contain the VM and Cache references to compare them!
if (!Object.ReferenceEquals(localRequest, currentRequest))
{
return;
}
}
IList <T> initialEntities = null;
IPagingResponse pagingResponse = null;
try
{
if (hasPagedViewModel)
{
pagingResponse = ((IPagingRefresher <T>)Refresher).Populate(filterDescriptor, sortDescriptors, pagingRequest, contextInformation);
initialEntities = new List <T>();
foreach (Object obj in pagingResponse.Result)
{
initialEntities.Add((T)obj);
}
}
else
{
if (filterDescriptor != null || sortDescriptors != null)
{
contextInformation = new Object[2];
contextInformation[0] = filterDescriptor;
contextInformation[1] = sortDescriptors;
}
initialEntities = ((IRefresher <T>)Refresher).Populate(contextInformation);
}
}
catch (Exception e)
{
if (Log.ErrorEnabled)
{
Log.Error(e);
}
}
finally
{
GuiThreadHelper.InvokeInGui(delegate()
{
lock (currentRequestLock)
{
if (!Object.ReferenceEquals(localRequest, currentRequest))
{
return;
}
}
try
{
if (IsRefreshedDataValid(contextInformation))
{
if (initialEntities != null)
{
if (ToBeCreatedOnTop)
{
// ToBeCreated entities are never part of the initialEntities, so no doublette check necessary
foreach (T entity in model.Objects)
{
if ((entity is IDataObject) && ((IDataObject)entity).ToBeCreated)
{
initialEntities.Insert(0, entity);
}
}
}
model.Clear();
for (int a = 0, size = initialEntities.Count; a < size; a++)
{
T item = initialEntities[a];
model.InsertAt(a, item);
}
}
// Important to update the sorting states (if the provider disables gridviews own sorting mechanism):
if (hasPagedViewModel)
{
UpdatePagingInformation(pagingResponse);
}
UpdateAfterDCE();
}
}
catch (Exception ex)
{
if (Log.ErrorEnabled)
{
Log.Error(ex);
}
}
finally
{
model.IsBusy = false;
}
});
}
}
public virtual void DataChanged(IDataChange dataChange, DateTime dispatchTime, long sequenceId)
{
dataChange = dataChange.Derive(InterestedEntityTypes);
if (dataChange.IsEmpty)
{
return;
}
ISet <Object> directObjectsToDelete = null;
ISet <Type> requestedTypes = new HashSet <Type>();
IDictionary <Type, IEntityMetaData> typeToMetaDataDict = new Dictionary <Type, IEntityMetaData>();
GuiThreadHelper.InvokeInGuiAndWait(delegate()
{
IList <T> entities = Model.Objects;
for (int i = entities.Count; i-- > 0;)
{
Object entity = entities[i];
requestedTypes.Add(entity.GetType());
}
});
IList <IDataChangeEntry> dataChangeEntries = dataChange.Inserts;
for (int a = dataChangeEntries.Count; a-- > 0;)
{
requestedTypes.Add(dataChangeEntries[a].EntityType);
}
dataChangeEntries = dataChange.Updates;
for (int a = dataChangeEntries.Count; a-- > 0;)
{
requestedTypes.Add(dataChangeEntries[a].EntityType);
}
dataChangeEntries = dataChange.Deletes;
for (int a = dataChangeEntries.Count; a-- > 0;)
{
requestedTypes.Add(dataChangeEntries[a].EntityType);
}
IList <IEntityMetaData> metaDatas = EntityMetaDataProvider.GetMetaData(ListUtil.ToList(requestedTypes));
foreach (IEntityMetaData metaData in metaDatas)
{
typeToMetaDataDict[metaData.EntityType] = metaData;
}
bool consistsOnlyOfDirectDeletes = false;
if (dataChange.Deletes.Count > 0)
{
consistsOnlyOfDirectDeletes = true;
foreach (IDataChangeEntry deleteEntry in dataChange.Deletes)
{
if (deleteEntry is DirectDataChangeEntry)
{
if (directObjectsToDelete == null)
{
directObjectsToDelete = new IdentityHashSet <Object>();
}
directObjectsToDelete.Add(((DirectDataChangeEntry)deleteEntry).Entry);
}
else
{
consistsOnlyOfDirectDeletes = false;
}
}
}
IList <T> interestingEntities = null;
Object[] contextInformation = GetContextInformation();
IFilterDescriptor filterDescriptor = GetFilterDescriptor();
IList <ISortDescriptor> sortDescriptors = GetSortDescriptors();
IPagingRequest pagingRequest = GetPagingRequest();
IPagingResponse pagingResponse = null;
List <IDataChangeEntry> modifiedEntries = new List <IDataChangeEntry>();
modifiedEntries.AddRange(dataChange.All);
if (!consistsOnlyOfDirectDeletes)
{
interestingEntities = CacheContext.ExecuteWithCache(CacheProvider.GetCurrentCache(), delegate()
{
ConfigureCacheWithEagerLoads(Cache);
if (Refresher is IPagingRefresher <T> )
{
interestingEntities = new List <T>();
pagingResponse = ((IPagingRefresher <T>)Refresher).Refresh(modifiedEntries, filterDescriptor, sortDescriptors, pagingRequest, contextInformation);
foreach (Object obj in pagingResponse.Result)
{
interestingEntities.Add((T)obj);
}
return(interestingEntities);
}
else
{
if (filterDescriptor != null || sortDescriptors != null)
{
contextInformation = new Object[2];
contextInformation[0] = filterDescriptor;
contextInformation[1] = sortDescriptors;
}
return(((IRefresher <T>)Refresher).Refresh(modifiedEntries, contextInformation));
}
});
}
GuiThreadHelper.InvokeInGuiAndWait(delegate()
{
IList <T> entities = Model.Objects;
ISet <T> entitiesToAdd = null;
ISet <T> entitiesToRemove = null;
IDictionary <T, T> entitiesToReplace = null;
IDictionary <IObjRef, T> oldObjRefToOldEntityMap = null;
bool mergeModel = false;
if (interestingEntities != null && interestingEntities.Count > 0)
{
entitiesToAdd = new IdentityHashSet <T>(interestingEntities);
entitiesToRemove = new IdentityHashSet <T>(entities);
entitiesToReplace = new IdentityDictionary <T, T>();
oldObjRefToOldEntityMap = new Dictionary <IObjRef, T>();
mergeModel = true;
}
for (int i = entities.Count; i-- > 0;)
{
T oldEntity = entities[i];
if (directObjectsToDelete != null && directObjectsToDelete.Contains(oldEntity))
{
if (entitiesToRemove != null)
{
entitiesToRemove.Remove(oldEntity);
}
Model.RemoveAt(i);
continue;
}
Type oldEntityType = ProxyHelper.GetRealType(oldEntity.GetType());
PrimitiveMember idMember = typeToMetaDataDict[oldEntityType].IdMember;
Object oldEntityId = idMember.GetValue(oldEntity, false);
if (oldEntityId == null)
{
if (entitiesToRemove != null)
{
entitiesToRemove.Remove(oldEntity);
}
// Unpersisted object. This object should not be removed
// only because of a background DCE
continue;
}
bool entryRemoved = false;
foreach (IDataChangeEntry deleteEntry in dataChange.Deletes)
{
if (deleteEntry is DirectDataChangeEntry)
{
continue;
}
Object id = deleteEntry.Id;
if (!EqualsItems(oldEntityType, oldEntityId, deleteEntry.EntityType, id))
{
continue;
}
if (entitiesToRemove != null)
{
entitiesToRemove.Remove(oldEntity);
}
Model.RemoveAt(i);
entryRemoved = true;
break;
}
if (entryRemoved)
{
continue;
}
if (mergeModel)
{
IObjRef oldObjRef = new ObjRef(oldEntityType, ObjRef.PRIMARY_KEY_INDEX, oldEntityId, null);
T existingOldEntity = DictionaryExtension.ValueOrDefault(oldObjRefToOldEntityMap, oldObjRef);
if (existingOldEntity == null)
{
oldObjRefToOldEntityMap.Add(oldObjRef, oldEntity);
}
else if (!Object.ReferenceEquals(existingOldEntity, oldEntity))
{
// Force duplicate key exception
oldObjRefToOldEntityMap.Add(oldObjRef, oldEntity);
}
}
}
if (oldObjRefToOldEntityMap != null && oldObjRefToOldEntityMap.Count > 0)
{
IDictionary <IObjRef, T> newObjRefToNewEntityMap = new Dictionary <IObjRef, T>();
for (int a = interestingEntities.Count; a-- > 0;)
{
T newEntity = interestingEntities[a];
Type newEntityType = ProxyHelper.GetRealType(newEntity.GetType());
PrimitiveMember idMember = typeToMetaDataDict[newEntityType].IdMember;
Object newEntityId = idMember.GetValue(newEntity, false);
IObjRef newObjRef = new ObjRef(newEntityType, ObjRef.PRIMARY_KEY_INDEX, newEntityId, null);
newObjRefToNewEntityMap.Add(newObjRef, newEntity);
}
DictionaryExtension.Loop(oldObjRefToOldEntityMap, delegate(IObjRef objRef, T oldEntity)
{
T newEntity = DictionaryExtension.ValueOrDefault(newObjRefToNewEntityMap, objRef);
if (newEntity == null)
{
// Nothing to do if current oldEntity has no corresponding newEntity
return;
}
entitiesToAdd.Remove(newEntity);
if (!Object.ReferenceEquals(oldEntity, newEntity) &&
(dataChange.IsLocalSource || !(oldEntity is IDataObject) || !((IDataObject)oldEntity).ToBeUpdated))
{
entitiesToReplace[oldEntity] = newEntity;
}
entitiesToRemove.Remove(oldEntity);
});
}
if (mergeModel)
{
for (int a = entities.Count; a-- > 0;)
{
T item = entities[a];
if (entitiesToRemove.Contains(item))
{
Model.RemoveAt(a);
continue;
}
T replacingItem = DictionaryExtension.ValueOrDefault(entitiesToReplace, item);
if (replacingItem != null)
{
Model.Replace(a, replacingItem);
continue;
}
}
IEnumerator <T> enumerator = entitiesToAdd.GetEnumerator();
while (enumerator.MoveNext())
{
T entityToAdd = enumerator.Current;
Model.Add(entityToAdd);
}
if (hasPagedViewModel)
{
UpdatePagingInformation(pagingResponse);
}
UpdateAfterDCE();
}
});
}
public virtual IPagingResponse FindTestEntities(IFilterDescriptor filterDescriptor, ISortDescriptor[] sortDescriptors, IPagingRequest pagingRequest)
{
IList <Object> allIdsOfTypeInCache = PersistenceMock.GetAllIds <TestEntity>();
IList <Object> result = Cache.GetObjects(typeof(TestEntity), allIdsOfTypeInCache);
PagingResponse pagingResponse = new PagingResponse();
if (pagingRequest != null)
{
pagingResponse.Number = pagingRequest.Number;
}
pagingResponse.Result = result;
return(pagingResponse);
}
public static PagedList <T> ToPagedList <T>(this IQueryable <T> source, IPagingRequest request)
{
return(new PagedList <T>(source, request));
}
