blob: 42e2b07d5ca5a6f2d906afcbcd5ee1ec8b56fe40 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
package spark.storage
import java.nio.ByteBuffer
/**
* An interface for writing JVM objects to some underlying storage. This interface allows
* appending data to an existing block, and can guarantee atomicity in the case of faults
* as it allows the caller to revert partial writes.
*
* This interface does not support concurrent writes.
*/
abstract class BlockObjectWriter(val blockId: String) {
var closeEventHandler: () => Unit = _
def open(): BlockObjectWriter
def close() {
closeEventHandler()
}
def isOpen: Boolean
def registerCloseEventHandler(handler: () => Unit) {
closeEventHandler = handler
}
/**
* Flush the partial writes and commit them as a single atomic block. Return the
* number of bytes written for this commit.
*/
def commit(): Long
/**
* Reverts writes that haven't been flushed yet. Callers should invoke this function
* when there are runtime exceptions.
*/
def revertPartialWrites()
/**
* Writes an object.
*/
def write(value: Any)
/**
* Size of the valid writes, in bytes.
*/
def size(): Long
}
|
