* up the necessary in-memory cache information.
   *
   * The initialization time may vary depending on the journal file size and the current actual
   * cache size. The application needs to be aware of calling this function during the
   * initialization phase and preferably in a background worker thread.
   *

I'll show you some concrete examples in the next chapters.

---

Then the next concepts to consider are all about the program running your actual API (e.g. Uvicorn).

## Program and Process { #program-and-process }

We will talk a lot about the running "**process**", so it's useful to have clarity about what it means, and what's the difference with the word "**program**".

   */
  private static final long UNEXPECTED_HANG_DELAY_MILLIS = 10000;

  /**
   * Various scenarios to be generated for each method under test. The actual scenario generation
   * (determining which scenarios are applicable to which methods and what the outcome should be)
   * takes place in {@link #addTests(TestSuite, Method)}.
   */
  private enum Scenario {

        // Data: bitSize / 8 bytes
        long predictedSize = bf.bitSize() / 8 + 6;
        assertThat(bf.serializedSize()).isEqualTo(predictedSize);

        // Serialize and measure actual size
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        bf.writeTo(out);
        int actualSize = out.size();
        assertThat(bf.serializedSize()).isEqualTo(actualSize);

public abstract class ServerMessageBlock2 implements CommonServerMessageBlock {

    /*
     * These are all the smbs supported by this library. This includes requests
     * and well as their responses for each type however the actual implementations
     * of the readXxxWireFormat and writeXxxWireFormat methods may not be in
     * place. For example at the time of this writing the readXxxWireFormat

```

        queryFieldConfig.highlightedFields = null;

        // When highlightedFields is null, the method should handle it gracefully
        // or throw an exception. Test the actual behavior.
        queryFieldConfig.highlightedFields(stream -> {
            // If it doesn't throw NPE, it should provide an empty stream
            assertEquals(0, stream.count());
        });
    }

        cmdList.add("test");
        cmdList.add("command");

        File propFile = new File(tempDir, "test.properties");

        // Mock ComponentUtil.getSystemProperties() to return actual system properties
        Properties systemProps = System.getProperties();

        // Set a system property
        System.setProperty("test.prop", "test.value");

        SMBUtil.writeInt8(1000000, buffer, 20); // Total allocation units
        SMBUtil.writeInt8(500000, buffer, 28); // Caller available units
        SMBUtil.writeInt8(600000, buffer, 36); // Actual available units
        SMBUtil.writeInt4(512, buffer, 44); // Sectors per unit
        SMBUtil.writeInt4(4096, buffer, 48); // Bytes per sector

        int result = response.readBytesWireFormat(buffer, bufferIndex);

        int wireCommentOffset = actualCommentOffset + converterValue;
        SMBUtil.writeInt4(wireCommentOffset, buffer, bufferIndex);
        bufferIndex += 4;

        // Write comment at actual offset
        byte[] commentBytes = comment.getBytes(StandardCharsets.US_ASCII);
        System.arraycopy(commentBytes, 0, buffer, actualCommentOffset, commentBytes.length);