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;
    }

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                streamVariable);
        assertTrue(targetUrl.startsWith("app://APP/UPLOAD/-1/"
                + owner.getConnectorId() + "/myName/"));


        ConnectorTracker tracker = owner.getUI().getConnectorTracker();
        StreamVariable streamVariable2 = tracker.getStreamVariable(
                owner.getConnectorId(), variableName);
        assertSame(streamVariable, streamVariable2);
    }

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                    if (files != null) {
                        consoleString += "<br>" + files.length + " file(s):";
                        for (Html5File file : files) {
                            consoleString += "<br>" + file.getFileName();
                            file.setStreamVariable(new StreamVariable() {


                                @Override
                                public void streamingStarted(
                                        StreamingStartEvent event) {
                                }

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    @Test
    public void getStreamVariable_streamingFailed_endUploadIsCalled() {
        TestUpload upload = new TestUpload();
        upload.startUpload();
        StreamVariable variable = upload.getStreamVariable();
        try {
            variable.streamingFailed(new TestStreamingErrorEvent());
        } catch (Exception e) {
        }
        Assert.assertFalse(upload.isUploading());
    }

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                                                    + file.getFileName()
                                                    + " was too large, not transferred to the server side.");
                            continue;
                        }


                        StreamVariable streamVariable = new StreamVariable() {


                            @Override
                            public OutputStream getOutputStream() {
                                return new NullOutputStream();
                            }

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                    for (Html5File html5File : files2) {
                        String fileName = html5File.getFileName();
                        // int bytes = html5File.getFileSize();
                        final ByteArrayOutputStream bas = new ByteArrayOutputStream();


                        StreamVariable streamVariable = new StreamVariable() {


                            @Override
                            public OutputStream getOutputStream() {
                                return bas;
                            }

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            Html5File[] files = wtr.getFiles();
            if (files != null) {
                for (Html5File html5File : files) {
                    l.setCaption(html5File.getFileName());
                    html5File.setStreamVariable(new StreamVariable() {
                        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();


                        @Override
                        public OutputStream getOutputStream() {
                            return byteArrayOutputStream;

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        String connectorId = parts[1];
        String variableName = parts[2];


        // These are retrieved while session is locked
        ClientConnector source;
        StreamVariable streamVariable;


        session.lock();
        try {
            UI uI = session.getUIById(Integer.parseInt(uiId));
            UI.setCurrent(uI);

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

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        String connectorId = parts[1];
        String variableName = parts[2];


        // These are retrieved while session is locked
        ClientConnector source;
        StreamVariable streamVariable;


        session.lock();
        try {
            UI uI = session.getUIById(Integer.parseInt(uiId));
            UI.setCurrent(uI);

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