File I/O Integration

Learn how to capture the performance of file I/O operations.

Capturing transactions requires that you first set up performance monitoring if you haven't already.

Sentry file I/O integration provides the SentryFileInputStream/SentryFileOutputStream and SentryFileReader/SentryFileWriter, which create a span for each File read/write operation.

The file I/O Integration is available under the core Java SDK package.

Copied
<dependency>
    <groupId>io.sentry</groupId>
    <artifactId>sentry</artifactId>
    <version
  >7.9.0</version>
</dependency>

For other dependency managers, see the central Maven repository.

To instrument FileInputStream/FileOutputStream the SDK provides drop-in replacements such as SentryFileInputStream/SentryFileOutputStream.

Old:

Copied
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

File file1 = new File("file1.txt");
File file2 = new File("file2.txt");
try (FileInputStream fis = new FileInputStream(file1)) {
  byte[] buffer = new byte[1024];
  try (FileOutputStream fos = new FileOutputStream(file2)) {
    int read;
    while (true) {
      read = fis.read(buffer);
      if (read == -1) {
        break;
      }
      fos.write(buffer, 0, read);
    }
  }
}

New:

Copied
import io.sentry.instrumentation.file.SentryFileInputStream;
import io.sentry.instrumentation.file.SentryFileOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

File file1 = new File("file1.txt");
File file2 = new File("file2.txt");
try (FileInputStream fis = new SentryFileInputStream(file1)) {
  byte[] buffer = new byte[1024];
  try (FileOutputStream fos = new SentryFileOutputStream(file2)) {
    int read;
    while (true) {
      read = fis.read(buffer);
      if (read == -1) {
        break;
      }
      fos.write(buffer, 0, read);
    }
  }
}

Similarly, FileReader/FileWriter can be instrumented through SentryFileReader/SentryFileWriter:

Old:

Copied
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

File file1 = new File("file1.txt");
File file2 = new File("file2.txt");
try (FileReader reader = new FileReader(file1)) {
  char[] buffer = new char[1024];
  try (FileWriter writer = new FileWriter(file2, true)) {
    int read;
    while (true) {
      read = reader.read(buffer, 0, buffer.length);
      if (read == -1) {
        break;
      }
      writer.write(buffer, 0, buffer.length);
    }
    writer.flush();
  }
}

New:

Copied
import io.sentry.instrumentation.file.SentryFileReader;
import io.sentry.instrumentation.file.SentryFileWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

File file1 = new File("file1.txt");
File file2 = new File("file2.txt");
try (FileReader reader = new SentryFileReader(file1)) {
  char[] buffer = new char[1024];
  try (FileWriter writer = new SentryFileWriter(file2, true)) {
    int read;
    while (true) {
      read = reader.read(buffer, 0, buffer.length);
      if (read == -1) {
        break;
      }
      writer.write(buffer, 0, buffer.length);
    }
    writer.flush();
  }
}
Help improve this content
Our documentation is open source and available on GitHub. Your contributions are welcome, whether fixing a typo (drat!) or suggesting an update ("yeah, this would be better").