Reading Cell Values in Multiple Threads Simultaneously

Needing to read cell values in multiple threads simultaneously is a common requirement. This article explains how to use Aspose.Cells for this purpose.

To read cell values in more than one thread simultaneously, set Cells.setMultiThreadReading(boolean) to true. If you do not, you might get the wrong cell values.

The following code:

1. Creates a workbook.
2. Adds a worksheet.
3. Populates the worksheet with string values.
4. It then creates two threads that simultaneously read values from random cells. If the values read are correct, nothing happens. If the values read are incorrect, then a message is displayed.

If you comment this line:

testWorkbook.getWorksheets().get(0).getCells().setMultiThreadReading(true);

then the following message is displayed:

if (s !== "R" + row + "C" + col)
{
    console.log("This message box will show up when cells read values are incorrect.");
}

Otherwise, the program runs without showing any message which means all values read from cells are correct.

const path = require("path");
const AsposeCells = require("aspose.cells.node");

const dataDir = path.join(__dirname, "data");

let testWorkbook;

const threadLoop = () => {
    const random = Math.random;
    while (true) {
        try {
            const row = Math.floor(random() * 10000);
            const col = Math.floor(random() * 100);
            const s = testWorkbook.getWorksheets().get(0).getCells().get(row, col).getStringValue();
            if (s !== "R" + row + "C" + col) {
                console.log("This message will show up when cells read values are incorrect.");
            }
        } catch (e) {}
    }
};

const testMultiThreadingRead = () => {
    testWorkbook = new AsposeCells.Workbook();
    testWorkbook.getWorksheets().clear();
    testWorkbook.getWorksheets().add("Sheet1");

    for (let row = 0; row < 10000; row++)
        for (let col = 0; col < 100; col++)
            testWorkbook.getWorksheets().get(0).getCells().get(row, col).setValue("R" + row + "C" + col);

    // Uncommenting this line will enable multi-threaded reading    
    //testWorkbook.getWorksheets().get(0).getCells().setMultiThreadReading(true);

    const myThread1 = setInterval(threadLoop, 0);
    const myThread2 = setInterval(threadLoop, 0);

    setTimeout(() => {
        clearInterval(myThread1);
        clearInterval(myThread2);
    }, 5 * 1000);
};

testMultiThreadingRead();