Examples of com.vaadin.server.StreamVariable

com.vaadin.server.StreamVariable

StreamVariable is a special kind of variable whose value is streamed to an {@link OutputStream} provided by the {@link #getOutputStream()} method. E.g.in web terminals {@link StreamVariable} can be used to send large files frombrowsers to the server without consuming large amounts of memory.

Note, writing to the {@link OutputStream} is not synchronized by the terminal(to avoid stalls in other operations when eg. streaming to a slow network service or file system). If UI is changed as a side effect of writing to the output stream, developer must handle synchronization manually.

@author Vaadin Ltd. @since 6.5 @see PaintTarget#addVariable(VariableOwner,String,StreamVariable)

        Map<String, StreamVariable> map = pidToNameToStreamVariable
                .get(connectorId);
        if (map == null) {
            return null;
        }
        StreamVariable streamVariable = map.get(variableName);
        return streamVariable;
    }

Examples of com.vaadin.server.StreamVariable

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