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com.backendless.FootprintsManager Maven / Gradle / Ivy
Android SDK used by developers to provide Backendless API in apps.
package com.backendless;
import com.backendless.exceptions.BackendlessException;
import com.backendless.geo.GeoPoint;
import com.backendless.utils.ReflectionUtil;
import weborb.reader.AnonymousObject;
import weborb.reader.ArrayType;
import weborb.reader.NamedObject;
import java.util.*;
/**
* If server sends object object with fields a, b, c
* and the client's class declares only fields a, b, then this class saves
* field c in memory in order to send it with the next user's request.
*/
public class FootprintsManager
{
private static final FootprintsManager instance = new FootprintsManager();
private static Set marked = new HashSet(); //for cyclic entities
public final Inner Inner = new Inner();
private final Map persistenceCache = new WeakHashMap();
private FootprintsManager()
{
}
public static FootprintsManager getInstance()
{
return instance;
}
public Footprint getEntityFootprint( Object entity )
{
return persistenceCache.get( entity );
}
public String getObjectId( Object entity )
{
if( persistenceCache.containsKey( entity ) )
{
return getEntityFootprint( entity ).getObjectId();
}
return null;
}
public String getMeta( Object entity )
{
if( persistenceCache.containsKey( entity ) )
{
return getEntityFootprint( entity ).get__meta();
}
return null;
}
public Date getCreated( Object entity )
{
if( persistenceCache.containsKey( entity ) )
{
return getEntityFootprint( entity ).getCreated();
}
return null;
}
public Date getUpdated( Object entity )
{
if( persistenceCache.containsKey( entity ) )
{
return getEntityFootprint( entity ).getUpdated();
}
return null;
}
public class Inner
{
/**
* Puts missing properties like objectId, ___meta etc. into entity map.
*
* @param entity entity object
* @param entityMap entity map
*/
public void putMissingPropsToEntityMap( Object entity, Map entityMap )
{
//put objectId if exists in cache
if( !entityMap.containsKey( Persistence.DEFAULT_OBJECT_ID_FIELD ) )
{
String objectId = getObjectId( entity );
if( objectId != null )
{
entityMap.put( Persistence.DEFAULT_OBJECT_ID_FIELD, objectId );
}
}
//put __meta if exists in cache
if( !entityMap.containsKey( Persistence.DEFAULT_META_FIELD ) )
{
String meta = getMeta( entity );
if( meta != null )
{
entityMap.put( Persistence.DEFAULT_META_FIELD, meta );
}
}
}
/**
* When the object is created on server, client gets new instance of it. In order to remember the system fields
* (objectId, __meta etc.) it is required to duplicate the old instance in cache.
*
* @param serializedEntity entity's map used to iterate through fields and duplicate footprints recursively
* @param persistedEntity entity from server
* @param initialEntity entity on which a method was called (.save(), .create() etc.)
*/
void duplicateFootprintForObject( Map serializedEntity, Object persistedEntity,
Object initialEntity )
{
//to avoid endless recursion
if( marked.contains( persistedEntity ) )
{
return;
}
else
{
marked.add( persistedEntity );
}
try
{
//iterate through fields in the object and duplicate entities recursively
Set> entries = serializedEntity.entrySet();
for( Map.Entry entry : entries )
{
if( entry.getValue() instanceof Map )
{
// retrieve persisted entity's field value
Object persistedEntityFieldValue = ReflectionUtil.getFieldValue( persistedEntity, entry.getKey() );
// retrieve initial entity's field value
Object initialEntityFieldValue = ReflectionUtil.getFieldValue( initialEntity, entry.getKey() );
// duplicate footprint recursively
duplicateFootprintForObject( (Map) entry.getValue(), persistedEntityFieldValue, initialEntityFieldValue );
}
else if( entry.getValue() instanceof Collection )
{
// TODO: discuss and decide what to do with GeoPoints here
if( ((Collection) entry.getValue()).iterator().next() instanceof GeoPoint )
{
continue;
}
// retrieve persisted entity's field value (which is collection)
Collection persistedEntityFieldValue = (Collection) ReflectionUtil.getFieldValue( persistedEntity, entry.getKey() );
// retrieve initial entity's field value (which is collection)
Collection initialEntityFieldValue = (Collection) ReflectionUtil.getFieldValue( initialEntity, entry.getKey() );
Collection mapCollection = (Collection) entry.getValue();
// recursively duplicate footprint for each object in collection
Iterator persistedEntityFieldValueIterator = persistedEntityFieldValue.iterator();
Iterator initialEntityFieldValueIterator = initialEntityFieldValue.iterator();
Iterator mapCollectionIterator = mapCollection.iterator();
while( initialEntityFieldValueIterator.hasNext() )
{
duplicateFootprintForObject( (Map) mapCollectionIterator.next(), persistedEntityFieldValueIterator.next(), initialEntityFieldValueIterator.next() );
}
}
}
Footprint footprint = persistenceCache.get( initialEntity );
if( footprint != null )
{
persistenceCache.put( persistedEntity, footprint );
}
}
catch( NoSuchFieldException e )
{
throw new BackendlessException( e );
}
finally
{
marked.remove( persistedEntity );
}
}
/**
* Updates footprint for entity.
*
* @param serialized entity's map used to iterate through fields and update footprints recursively
* @param newEntity entity from server
* @param oldEntity entity on which a method was called (.save(), .create() etc.)
*/
void updateFootprintForObject( Map serialized, Object newEntity, Object oldEntity )
{
//to avoid endless recursion
if( marked.contains( newEntity ) )
{
return;
}
else
{
marked.add( newEntity );
}
try
{
//update footprints recursively
Set> entries = serialized.entrySet();
for( Map.Entry entry : entries )
{
String key = entry.getKey();
String upperKey = entry.getKey().substring( 0, 1 ).toUpperCase().concat( entry.getKey().substring( 1 ) );
if( entry.getValue() instanceof Map )
{
//find getter method and call it to get object property
Object newEntityField;
try
{
newEntityField = ReflectionUtil.getFieldValue( newEntity, key );
}
catch( NoSuchFieldException nfe )
{
//try to find field with first letter in uppercase
newEntityField = ReflectionUtil.getFieldValue( newEntity, upperKey );
}
Object oldEntityField;
try
{
oldEntityField = ReflectionUtil.getFieldValue( oldEntity, key );
}
catch( NoSuchFieldException nfe )
{
//try to find field with first letter in uppercase
oldEntityField = ReflectionUtil.getFieldValue( oldEntity, upperKey );
}
updateFootprintForObject( (Map) entry.getValue(), newEntityField, oldEntityField );
}
else if( entry.getValue() instanceof Collection )
{
Collection valueCollection = (Collection) entry.getValue();
Iterator valueIterator = valueCollection.iterator();
if( valueIterator.hasNext() && valueIterator.next() instanceof GeoPoint )
{
continue;
}
Collection newObjectCollection;
try
{
newObjectCollection = (Collection) ReflectionUtil.getFieldValue( newEntity, key );
}
catch( NoSuchFieldException nfe )
{
//try to find field with first letter in uppercase
newObjectCollection = (Collection) ReflectionUtil.getFieldValue( newEntity, upperKey );
}
Collection oldObjectCollection;
try
{
oldObjectCollection = (Collection) ReflectionUtil.getFieldValue( oldEntity, key );
}
catch( NoSuchFieldException nfe )
{
//try to find field with first letter in uppercase
oldObjectCollection = (Collection) ReflectionUtil.getFieldValue( oldEntity, upperKey );
}
Collection mapCollection = (Collection) entry.getValue();
Iterator mapCollectionIterator = mapCollection.iterator();
Iterator oldObjectCollectionIterator = oldObjectCollection.iterator();
Iterator newObjectCollectionIterator = newObjectCollection.iterator();
while( oldObjectCollectionIterator.hasNext() )
{
updateFootprintForObject( (Map) mapCollectionIterator.next(), newObjectCollectionIterator.next(), oldObjectCollectionIterator.next() );
}
}
}
Footprint footprint = persistenceCache.get( newEntity );
persistenceCache.put( oldEntity, footprint );
removeFootprintForObject( serialized, newEntity );
}
catch( NoSuchFieldException e )
{
throw new BackendlessException( e );
}
finally
{
marked.remove( newEntity );
}
}
/**
* Removes entity's footprint from cache.
*
* @param serializedEntity entity's map used to iterate through fields and remove footprints recursively
* @param entity entity to be removed
*/
void removeFootprintForObject( Map serializedEntity, Object entity )
{
//to avoid endless recursion
if( marked.contains( entity ) )
{
return;
}
else
{
marked.add( entity );
}
try
{
//iterate through object's properties and remove footprints recursively
Set> entries = serializedEntity.entrySet();
for( Map.Entry entry : entries )
{
if( entry.getValue() instanceof Map )
{
// retrieve entity field value
Object entityFieldValue = ReflectionUtil.getFieldValue( entity, entry.getKey() );
// remove footprints recursively
removeFootprintForObject( (Map) entry.getValue(), entityFieldValue );
}
else if( entry.getValue() instanceof Collection )
{
// retrieve entity field value (which is collection)
Collection entityFieldValue = (Collection) ReflectionUtil.getFieldValue( entity, entry.getKey() );
Collection mapCollection = (Collection) entry.getValue();
// remove footprints recursively for each object in collection
Iterator objectCollectionIterator = entityFieldValue.iterator();
Iterator mapCollectionIterator = mapCollection.iterator();
while( objectCollectionIterator.hasNext() )
{
removeFootprintForObject( (Map) mapCollectionIterator.next(), objectCollectionIterator.next() );
}
}
}
persistenceCache.remove( entity );
}
catch( NoSuchFieldException e )
{
throw new BackendlessException( e );
}
finally
{
marked.remove( entity );
}
}
/**
* Puts saved entity's footprint to cache.
* Key - instance, value - footprint, initialized from instance.
* Footprint is just an object, containing only fields
* objectId, created, updated, meta.
*
* @param instance saved object received from server
* @param entity IAdaptingType
*/
public void putEntityFootprintToCache( Object instance, Object entity )
{
//to avoid endless recursion
if( marked.contains( entity ) )
{
return;
}
else
{
marked.add( entity );
}
try
{
if( instance instanceof BackendlessCollection )
{
AnonymousObject typedObject = (AnonymousObject) ((NamedObject) entity).getTypedObject();
ArrayType dataArray = (ArrayType) typedObject.getProperties().get( "data" );
Object[] instances = ((BackendlessCollection) instance).getCurrentPage().toArray();
putEntityFootprintToCache( instances, dataArray );
}
else if( entity instanceof NamedObject )
{
putEntityFootprintToCache( instance, ((NamedObject) entity).getTypedObject() );
}
else if( entity instanceof AnonymousObject )
{
putEntityFootprintToCache( instance, ((AnonymousObject) entity).getProperties() );
}
else if( entity instanceof ArrayType )
{
Object[] entities = (Object[]) ((ArrayType) entity).getArray();
Object[] arrayInstance = instance instanceof List ? ((List) instance).toArray() : (Object[]) instance;
for( int i = 0; i < arrayInstance.length; i++ )
{
putEntityFootprintToCache( arrayInstance[ i ], entities[ i ] );
}
}
else
{
Map e = (Map) entity;
for( Map.Entry entityEntry : e.entrySet() )
{
Object entityEntryValue = entityEntry.getValue();
if( entityEntryValue instanceof NamedObject || entityEntryValue instanceof ArrayType )
{
Object innerInstance = ReflectionUtil.getFieldValue( instance, entityEntry.getKey() );
putEntityFootprintToCache( innerInstance, entityEntry.getValue() );
}
}
Map cachedEntity = (Map) entity;
persistenceCache.put( instance, Footprint.initFromEntity( cachedEntity ) );
}
}
catch( Exception e )
{/*Error in caching process should not fail application*/
}
marked.remove( entity );
}
}
}
