public abstract class**UploadDataProvider** extends Object  
implements Closeable  
Abstract class allowing the embedder to provide an upload body to[UrlRequest](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UrlRequest.html). It supports both non-chunked (size known in advanced) and chunked (size not known in advance) uploads. Be aware that not all servers support chunked uploads.

An upload is either always chunked, across multiple uploads if the data ends up being sent more than once, or never chunked.  

### Public Constructor Summary

|---|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
|   | [UploadDataProvider](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataProvider.html#UploadDataProvider())() |

### Public Method Summary

|---------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| void          | [close](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataProvider.html#close())() Called when this UploadDataProvider is no longer needed by a request, so that resources (like a file) can be explicitly released.                                                                                                                      |
| abstract long | [getLength](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataProvider.html#getLength())() If this is a non-chunked upload, returns the length of the upload.                                                                                                                                                                             |
| abstract void | [read](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataProvider.html#read(org.chromium.net.UploadDataSink,%20java.nio.ByteBuffer))([UploadDataSink](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataSink.html)uploadDataSink, ByteBuffer byteBuffer) Reads upload data into`byteBuffer`. |
| abstract void | [rewind](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataProvider.html#rewind(org.chromium.net.UploadDataSink))([UploadDataSink](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataSink.html)uploadDataSink) Rewinds upload data.                                                          |

### Inherited Method Summary

From class java.lang.Object  

|------------------|---------------------------|
| Object           | clone()                   |
| boolean          | equals(Object arg0)       |
| void             | finalize()                |
| final Class\<?\> | getClass()                |
| int              | hashCode()                |
| final void       | notify()                  |
| final void       | notifyAll()               |
| String           | toString()                |
| final void       | wait(long arg0, int arg1) |
| final void       | wait(long arg0)           |
| final void       | wait()                    |

From interface java.io.Closeable  

|---------------|---------|
| abstract void | close() |

From interface java.lang.AutoCloseable  

|---------------|---------|
| abstract void | close() |

## Public Constructors

#### public**UploadDataProvider**()

<br />

## Public Methods

#### public void**close**()

Called when this UploadDataProvider is no longer needed by a request, so that resources (like a file) can be explicitly released.  

##### Throws

| IOException | if any IOException occurred during the process. This will cause the request to fail if it is not yet complete; otherwise it will be logged. |
|-------------|---------------------------------------------------------------------------------------------------------------------------------------------|

#### public abstract long**getLength**()

If this is a non-chunked upload, returns the length of the upload. Must always return -1 if this is a chunked upload.  

##### Returns

- the length of the upload for non-chunked uploads, -1 otherwise.  

##### Throws

| IOException | if any IOException occurred during the process. |
|-------------|-------------------------------------------------|

#### public abstract void**read**([UploadDataSink](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataSink.html)uploadDataSink, ByteBuffer byteBuffer)

Reads upload data into`byteBuffer`. Upon completion, the buffer's position is updated to the end of the bytes that were read. The buffer's limit is not changed. Each call of this method must be followed be a single call, either synchronous or asynchronous, to`uploadDataSink`:[UploadDataSink.onReadSucceeded(boolean)](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataSink.html#onReadSucceeded(boolean))on success or[UploadDataSink.onReadError(Exception)](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataSink.html#onReadError(java.lang.Exception))on failure. Neither read nor rewind will be called until one of those methods or the other is called. Even if the associated[UrlRequest](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UrlRequest.html)is canceled, one or the other must still be called before resources can be safely freed. Throwing an exception will also result in resources being freed and the request being errored out.  

##### Parameters

| uploadDataSink | The object to notify when the read has completed, successfully or otherwise. |
|   byteBuffer   |  The buffer to copy the read bytes into. Do not change byteBuffer's limit.   |
|----------------|------------------------------------------------------------------------------|

##### Throws

| IOException | if any IOException occurred during the process.[UrlRequest.Callback.onFailed(UrlRequest, UrlResponseInfo, CronetException)](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UrlRequest.Callback.html#onFailed(org.chromium.net.UrlRequest,%20org.chromium.net.UrlResponseInfo,%20org.chromium.net.CronetException))will be called with the thrown exception set as the cause of the[CallbackException](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/CallbackException.html). |
|-------------| |

#### public abstract void**rewind**([UploadDataSink](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataSink.html)uploadDataSink)

Rewinds upload data. Each call must be followed be a single call, either synchronous or asynchronous, to`uploadDataSink`:[UploadDataSink.onRewindSucceeded()](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataSink.html#onRewindSucceeded())on success or[UploadDataSink.onRewindError(Exception)](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataSink.html#onRewindError(java.lang.Exception))on failure. Neither read nor rewind will be called until one of those methods or the other is called. Even if the associated[UrlRequest](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UrlRequest.html)is canceled, one or the other must still be called before resources can be safely freed. Throwing an exception will also result in resources being freed and the request being errored out.

If rewinding is not supported, this should call[UploadDataSink.onRewindError(Exception)](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UploadDataSink.html#onRewindError(java.lang.Exception)). Note that rewinding is required to follow redirects that preserve the upload body, and for retrying when the server times out stale sockets.  

##### Parameters

| uploadDataSink | The object to notify when the rewind operation has completed, successfully or otherwise. |
|----------------|------------------------------------------------------------------------------------------|

##### Throws

| IOException | if any IOException occurred during the process.[UrlRequest.Callback.onFailed(UrlRequest, UrlResponseInfo, CronetException)](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/UrlRequest.Callback.html#onFailed(org.chromium.net.UrlRequest,%20org.chromium.net.UrlResponseInfo,%20org.chromium.net.CronetException))will be called with the thrown exception set as the cause of the[CallbackException](https://developer.android.com/develop/connectivity/cronet/reference/org/chromium/net/CallbackException.html). |
|-------------| |