After an object is uploaded, Object Storage Service (OSS) can send a callback request to the application server. To configure upload callback, you need to only add the related callback parameters to the upload request that is sent to OSS. This topic describes how to configure upload callback.
Note Compared with simple upload, the upload with callback configured requires the client to wait for a longer period of time to process a callback request and response.
Sample code
The following sample code provides an example on how to configure upload callback:
// Construct an upload request.
// Specify the name of the bucket, the full path of the object, and the full path of the local file. In this example, the name of the bucket is examplebucket, the full path of the object is exampledir/exampleobject.txt, and the full path of the local file is /storage/emulated/0/oss/examplefile.txt.
// Do not include the bucket name in the full path of the object.
PutObjectRequest put = new PutObjectRequest("examplebucket", "exampledir/exampleobject.txt", "/storage/emulated/0/oss/examplefile.txt");
put.setCallbackParam(new HashMap<String, String>() {
{
put("callbackUrl", "http://oss-demo.aliyuncs.com:23450");
put("callbackHost", "yourCallbackHost");
put("callbackBodyType", "application/json");
put("callbackBody", "{\"mimeType\":${mimeType},\"size\":${size}}");
}
});
OSSAsyncTask task = oss.asyncPutObject(put, new OSSCompletedCallback<PutObjectRequest, PutObjectResult>() {
@Override
public void onSuccess(PutObjectRequest request, PutObjectResult result) {
Log.d("PutObject", "UploadSuccess");
// Obtain the returned callback information. You can obtain the callback information only if you specify servercallback in the request.
String serverCallbackReturnJson = result.getServerCallbackReturnBody();
Log.d("servercallback", serverCallbackReturnJson);
}
@Override
public void onFailure(PutObjectRequest request, ClientException clientExcepion, ServiceException serviceException) {
// Handle exceptions.
}
});
The following sample code provides an example on how to configure custom parameters:
put.setCallbackParam(new HashMap<String, String>() {
{
put("callbackUrl", "http://oss-demo.aliyuncs.com:23450");
put("callbackHost", "yourCallbackHost");
put("callbackBodyType", "application/json");
put("callbackBody", "{\"object\":${object},\"size\":${size},\"my_var1\":${x:var1},\"my_var2\":${x:var2}}");
}
});
put.setCallbackVars(new HashMap<String, String>() {
{
put("x:var1", "value1");
put("x:var2", "value2");
}
});