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File viewer for Vaadin

Log viewer / glogg

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Log viewer/watcher glogg

This add-on works similarly to the popular log viewer software called glogg.

Enables:

• Viewing huge files, especially logs, without performance or ram usage loss
• Monitoring changes in displayed files and dynamically extending the content
• File search
• Dynamic extension of search results with changes in files (new entries)

Requires @Push enabled for stable and comfortable work

Each file is indexed before being displayed and only a part is streamed on demand (50 rows per request when scrolling). Files are not stored in memory.

Styling

Since the extension uses default vaadin components, all used components have been made available for modification via getters.

If you want to display the entire log line without text-wrapping, you need to extend your style file vaadin-grid.css about this entry:

:host([theme~='log']) [part~='cell']:not([part~='details-cell']) {
    white-space: break-spaces;
}

Additional configuration

• You can disable/hide polling configuration and also search bar. To do that you have to pass configuration to the constructor of the FileViewer

    FileViewer viewer = new FileViewer(new FileViewerConfig(){

            @Override
            public boolean pollingEnabled() {
                return false;
            }

            @Override
            public int pollingInterval() {
                return 1;
            }

            @Override
            public boolean searchViewVisible() {
                return false;
            }
        });

Layout structure

|---------------------------------------------------------------|
|                FileViewer - VerticalLayout                    |
|  |---------------------------------------------------------|  |
|  |              PollingMenuBar  - MenuBar                  |  |
|  |---------------------------------------------------------|  |
|  |               FileTabSheet  - TabSheet                  |  |
|  |  |---------------------------------------------------|  |  |
|  |  |               FileTab  -  Div                     |  |  |
|  |  |  |---------------------------------------------|  |  |  |
|  |  |  |          FileContentGrid - Grid             |  |  |  |
|  |  |  |---------------------------------------------|  |  |  |
|  |  |  |      FileSearchLayout - VerticalLayout      |  |  |  |
|  |  |  |  |---------------------------------------|  |  |  |  |
|  |  |  |  |       SearchBarFields - MenuBar       |  |  |  |  |
|  |  |  |  |---------------------------------------|  |  |  |  |
|  |  |  |  |        SearchResultGrid - Grid        |  |  |  |  |
|  |  |  |  |---------------------------------------|  |  |  |  |
|  |  |  |                                             |  |  |  |
|  |  |  | --------------------------------------------|  |  |  |
|  |  |---------------------------------------------------|  |  |
|  |---------------------------------------------------------|  |
|---------------------------------------------------------------|

Sample code

FileViewer viewer = new FileViewer();

viewer.openFile(new File("...).toPath());
viewer.openFile(new File("...").toPath());

add(viewer);

Links

• View on GitHub

Compatibility