Package org.zkoss.zk.au

Interface AuWriter

All Known Implementing Classes:

HttpAuWriter

public interface AuWriter

Represents a writer that is used to send the output back to the client, when processing AuRequest.

To use the writer, open(java.lang.Object, java.lang.Object) must be called first. And, close(java.lang.Object, java.lang.Object) after all responses are written.

Since:

3.0.1

Author:

tomyeh

See Also:

• AuWriters.setImplementationClass(java.lang.Class)

Method Summary

Modifier and Type	Method	Description
void	close(Object request, Object response)	Closes the writer and flush the result to client.
Object	complete()	Indicates the writing has been completed.
AuWriter	open(Object request, Object response)	Initializes the writer.
void	resend(Object prevContent)	Resend the content of the previous request returned by complete().
void	setCompress(boolean compress)	Sets whether to compress the output with GZIP.
void	write(Collection<AuResponse> responses)	Generates a list of responses to the output.
void	write(AuResponse response)	Generates the specified the response to the output.
void	writeResponseId(int resId)	Generates the response ID to the output.

Method Details

setCompress

void setCompress(boolean compress)

Sets whether to compress the output with GZIP.

Default: true.

Since:

3.6.3

open

AuWriter open(Object request,
 Object response)
       throws IOException

Initializes the writer.

Parameters:

request - the request (HttpServletRequest if HTTP)

response - the response (HttpServletResponse if HTTP)

Returns:

this object

Throws:

IOException

Since:

6.0.0 (the signature is simplified)

close

void close(Object request,
 Object response)
    throws IOException

Closes the writer and flush the result to client.

Parameters:

request - the request (HttpServletRequest if HTTP)

response - the response (HttpServletResponse if HTTP)

Throws:

IOException

complete

Object complete()
         throws IOException

Indicates the writing has been completed. Invokes this method before close(java.lang.Object, java.lang.Object), if the caller supports the resend mechanism. The caller usually stores the return value to a desktop by DesktopCtrl.responseSent(java.lang.String, java.lang.Object)).

Unlike close(java.lang.Object, java.lang.Object), this method must be called in an activated execution.

Once this method is called, the caller shall not invoke any other write method. It shall invoke only close(java.lang.Object, java.lang.Object) to end the writer.

Throws:

IOException

Since:

5.0.4

resend

void resend(Object prevContent)
     throws IOException

Resend the content of the previous request returned by complete().

The content is usually stored to a desktop by DesktopCtrl.responseSent(java.lang.String, java.lang.Object), and retrieved by DesktopCtrl.getLastResponse(java.lang.String).

Once this method is called, the caller shall not invoke any other write method nor complete(). It shall invoke only close(java.lang.Object, java.lang.Object) to end the writer.

Parameters:

prevContent - the previous content returned by close(java.lang.Object, java.lang.Object) of the previous AuWriter.

Throws:

IllegalArgumentException - if prevContent is null.

IllegalStateException - if any of write methods (such as write(org.zkoss.zk.au.AuResponse)) is called.

IOException

Since:

5.0.4

writeResponseId

void writeResponseId(int resId)
              throws IOException

Generates the response ID to the output.

Throws:

IOException

Since:

3.5.0

See Also:

• DesktopCtrl.getResponseId(boolean)

write

void write(AuResponse response)
    throws IOException

Generates the specified the response to the output.

Throws:

IOException

write

void write(Collection<AuResponse> responses)
    throws IOException

Generates a list of responses to the output.

Throws:

IOException