DbCache (android-data-storage 1.1.0 API)

java.lang.Object
- xiaofei.library.datastorage.database.DbCache

所有已实现的接口:

IDbOperation
```
public class DbCache
extends java.lang.Object
implements IDbOperation
```
Created by Xiaofei on 15/11/9. This class is used as the database cache. It is thread-safe. In this framework, the DatabaseStorage class is an implementation of the IDataStorage interface. In the DatabaseStorage class, the storage has two level, a high level which is the memory cache and a low level which is the database file. A loading operation first searches the high level for the specified data. If the search is successful, the loading operation succeeds. Otherwise, the low level loads the specified data from the database file (if it exists), and the high level stores it in the memory cache and return it as the search result. Any following loading operation of the same data obtains the data from the memory cache and thus avoids the heavy-overhead operations of database. Each operation is performed both in the high level and the low level. The memory cache has an excellent performance, so the effect of the operation is immediate. The overhead of database operation is heavy, so the operation is performed asynchronously. To avoiding any exception when operating the database, this class uses a single-thread executor to perform database operations sequentially. Before any operation, a sync operation is performed to check whether the high level has the data of the specified class, and if it does not, the low level simply load all the data of the specified class from the database.

方法概要

All Methods Instance Methods Concrete Methods
限定符和类型	方法和说明
`void`	`clearTable()` Delete all the objects in the table.
`void`	`close()` Close the database.
`boolean`	`containsObject(java.lang.Class clazz, java.lang.String objectId)` Return true if the table contains the object of the specified class and the specified object id.
`<T> void`	`deleteAllObjects(java.lang.Class<T> clazz)` Delete all the object of the specified class.
`void`	`deleteObject(java.lang.Class clazz, java.lang.String objectId)` Delete the object of the specified class and the specified object id.
`<T> void`	`deleteObjects(java.lang.Class<T> clazz, Condition<T> condition)`
`<T> void`	`deleteObjects(java.lang.Class<T> clazz, java.util.List<java.lang.String> objectIds)` Delete the objects of the specified class and the specified object ids.
`<T> java.util.List<<any>>`	`getAllObjects(java.lang.Class<T> clazz)` Return all the objects of the specified class.
`<T> T`	`getObject(java.lang.Class<T> clazz, java.lang.String objectIds)` Return the objects of the specified class and the specified object ids.
`<T> java.util.List<<any>>`	`getObjects(java.lang.Class<T> clazz, Condition<T> condition)` Return the objects of the specified class, which satisfy the condition.
`<T> void`	`insertObject(T object, java.lang.String objectId)` Insert the object of the specified object id.
`<T> void`	`insertObjects(java.util.List<T> objects, java.util.List<java.lang.String> objectIds)` Insert the objects of the specified object ids.
`<T> void`	`replaceObjects(java.lang.Class<T> clazz, java.util.List<java.lang.String> oldObjectIds, java.util.List<T> newObjects, java.util.List<java.lang.String> newObjectIds)` Replace the objects of the old object ids with the objects of the new object ids.
`void`	`updateAllObjects()`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 方法详细资料
  - close
```
public void close()
```
    从接口复制的说明: IDbOperation
    
    Close the database.
    
    指定者:
    
    close 在接口中 IDbOperation
  - deleteObject
```
public void deleteObject(java.lang.Class clazz,
                         java.lang.String objectId)
```
    从接口复制的说明: IDbOperation
    
    Delete the object of the specified class and the specified object id.
    
    指定者:
    
    deleteObject 在接口中 IDbOperation
  - deleteAllObjects
```
public <T> void deleteAllObjects(java.lang.Class<T> clazz)
```
    从接口复制的说明: IDbOperation
    
    Delete all the object of the specified class.
    
    指定者:
    
    deleteAllObjects 在接口中 IDbOperation
  - deleteObjects
```
public <T> void deleteObjects(java.lang.Class<T> clazz,
                              java.util.List<java.lang.String> objectIds)
```
    从接口复制的说明: IDbOperation
    
    Delete the objects of the specified class and the specified object ids.
    
    指定者:
    
    deleteObjects 在接口中 IDbOperation
  - deleteObjects
```
public <T> void deleteObjects(java.lang.Class<T> clazz,
                              Condition<T> condition)
```
  - containsObject
```
public boolean containsObject(java.lang.Class clazz,
                              java.lang.String objectId)
```
    从接口复制的说明: IDbOperation
    
    Return true if the table contains the object of the specified class and the specified object id. Return false otherwise.
    
    指定者:
    
    containsObject 在接口中 IDbOperation
    
    返回:
  - insertObject
```
public <T> void insertObject(T object,
                             java.lang.String objectId)
```
    从接口复制的说明: IDbOperation
    
    Insert the object of the specified object id. If the table contains an object of the same id, it replace the old one with the new one.
    
    指定者:
    
    insertObject 在接口中 IDbOperation
  - insertObjects
```
public <T> void insertObjects(java.util.List<T> objects,
                              java.util.List<java.lang.String> objectIds)
```
    从接口复制的说明: IDbOperation
    
    Insert the objects of the specified object ids. If the table contains an object of the same id, it replace the old one with the new one.
    
    指定者:
    
    insertObjects 在接口中 IDbOperation
  - getAllObjects
```
public <T> java.util.List<<any>> getAllObjects(java.lang.Class<T> clazz)
```
    从接口复制的说明: IDbOperation
    
    Return all the objects of the specified class. The result is a list of pairs, whose first element is the object id and the second element is the corresponding object.
    
    指定者:
    
    getAllObjects 在接口中 IDbOperation
    
    返回:
  - getObject
```
public <T> T getObject(java.lang.Class<T> clazz,
                       java.lang.String objectIds)
```
    从接口复制的说明: IDbOperation
    
    Return the objects of the specified class and the specified object ids.
    
    指定者:
    
    getObject 在接口中 IDbOperation
    
    返回:
  - getObjects
```
public <T> java.util.List<<any>> getObjects(java.lang.Class<T> clazz,
                                            Condition<T> condition)
```
    从接口复制的说明: IDbOperation
    
    Return the objects of the specified class, which satisfy the condition.
    
    指定者:
    
    getObjects 在接口中 IDbOperation
    
    返回:
  - replaceObjects
```
public <T> void replaceObjects(java.lang.Class<T> clazz,
                               java.util.List<java.lang.String> oldObjectIds,
                               java.util.List<T> newObjects,
                               java.util.List<java.lang.String> newObjectIds)
```
    从接口复制的说明: IDbOperation
    
    Replace the objects of the old object ids with the objects of the new object ids.
    
    指定者:
    
    replaceObjects 在接口中 IDbOperation
  - clearTable
```
public void clearTable()
```
    从接口复制的说明: IDbOperation
    
    Delete all the objects in the table.
    
    指定者:
    
    clearTable 在接口中 IDbOperation
  - updateAllObjects
```
public void updateAllObjects()
```

类 DbCache

方法概要

从类继承的方法 java.lang.Object

方法详细资料

close

deleteObject

deleteAllObjects

deleteObjects

deleteObjects

containsObject

insertObject

insertObjects

getAllObjects

getObject

getObjects

replaceObjects

clearTable

updateAllObjects