MetastoreCursor (BookKeeper Java API (version 4.15.0-SNAPSHOT))

All Superinterfaces:

java.lang.AutoCloseable, java.io.Closeable

All Known Implementing Classes:

InMemoryMetastoreCursor
```
public interface MetastoreCursor
extends java.io.Closeable
```
A Metastore Cursor.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface MetastoreCursor.ReadEntriesCallback
A callback for reading entries.

Field Summary

Fields
Modifier and Type Field Description

static MetastoreCursor EMPTY_CURSOR

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`asyncReadEntries(int numEntries, MetastoreCursor.ReadEntriesCallback callback, java.lang.Object ctx)`	Asynchronously read entries from the cursor, up to the specified `numEntries`.
`boolean`	`hasMoreEntries()`	Is there any entries left in the cursor to read.
`java.util.Iterator<MetastoreTableItem>`	`readEntries(int numEntries)`	Read entries from the cursor, up to the specified `numEntries`.

Methods inherited from interface java.io.Closeable
close

- Field Detail
  - EMPTY_CURSOR
```
static final MetastoreCursor EMPTY_CURSOR
```
- Method Detail
  - hasMoreEntries
```
boolean hasMoreEntries()
```
    Is there any entries left in the cursor to read.
    
    Returns:
    
    true if there is entries left, false otherwise.
  - readEntries
```
java.util.Iterator<MetastoreTableItem> readEntries(int numEntries)
                                            throws MSException
```
    Read entries from the cursor, up to the specified numEntries. The returned list can be smaller.
    
    Parameters:
    
    numEntries - maximum number of entries to read
    
    Returns:
    
    the iterator of returned entries.
    
    Throws:
    
    MSException - when failed to read entries from the cursor.
  - asyncReadEntries
```
void asyncReadEntries(int numEntries,
                      MetastoreCursor.ReadEntriesCallback callback,
                      java.lang.Object ctx)
```
    Asynchronously read entries from the cursor, up to the specified numEntries.
    
    Parameters:
    
    numEntries - maximum number of entries to read
    
    callback - callback object
    
    ctx - opaque context
    
    See Also:
    
    readEntries(int)