Master the error processing and abnormal mechanism of Flatbuffers Java API
Master the error processing and abnormal mechanism of Flatbuffers Java API
Flatbuffers is an efficient cross -platform serialization library that can generate compact binary data and make the read and write data more efficient.When using the Java API of Flatbuffers, you need to master the error processing and abnormal mechanism to ensure the stability and reliability of the code.This article will introduce errors and abnormalities when using Flatbuffers, and provide some Java code examples.
1. Error treatment
In the process of using Flatbuffers, some errors may be encountered, such as files cannot be opened, read and write errors.In order to be able to discover and deal with these errors in time, we can use the abnormal processing mechanism in Java.
When reading or writing data with Flatbuffers, you can capture and process the IOEXception exception.Below is an example code that read Flatbuffers data:
import java.io.FileInputStream;
import java.io.IOException;
import com.google.flatbuffers.FlatBufferBuilder;
import com.google.flatbuffers.FlatBufferBuilder.ByteBufferFactory;
import com.google.flatbuffers.Table;
public class FlatBuffersExample {
public static void main(String[] args) {
try(FileInputStream fis = new FileInputStream("data.bin")) {
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
ByteBufferFactory factory = new ByteBufferFactory() {
@Override
public java.nio.ByteBuffer newByteBuffer(int capacity) {
return java.nio.ByteBuffer.allocateDirect(capacity);
}
};
FlatBufferBuilder fbb = new FlatBufferBuilder(factory);
fbb.clear();
fbb.putByteBuffer(java.nio.ByteBuffer.wrap(buffer));
// Read Flatbuffers data
// ...
} catch (IOException e) {
e.printStackTrace();
}
}
}
In the above code, IOEXception exception was captured through the TRY-CATCH block, and an anomalous information was printed with the E.printStacktrace () method.By processing abnormalities, the program can avoid collapse when errors and corresponding errors.
2. Anomalial mechanism
In addition to using IOEXCETION for error processing, custom abnormalities can also be thrown out under certain circumstances.For example, errors occur when reading or parsing Flatbuffers data, you can throw a custom Flatbuffersexception anomaly.
The following is a custom Flatbuffersexception example, which inherits the Exception class:
public class FlatBuffersException extends Exception {
public FlatBuffersException(String message) {
super(message);
}
public FlatBuffersException(String message, Throwable cause) {
super(message, cause);
}
}
When reading or parsing data with Flatbuffers, if an error occurs, you can throw a Flatbuffersexception anomaly.For example:
import java.io.FileInputStream;
import java.io.IOException;
import com.google.flatbuffers.FlatBufferBuilder;
import com.google.flatbuffers.FlatBufferBuilder.ByteBufferFactory;
import com.google.flatbuffers.Table;
public class FlatBuffersExample {
public static void main(String[] args) throws FlatBuffersException {
try(FileInputStream fis = new FileInputStream("data.bin")) {
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
ByteBufferFactory factory = new ByteBufferFactory() {
@Override
public java.nio.ByteBuffer newByteBuffer(int capacity) {
return java.nio.ByteBuffer.allocateDirect(capacity);
}
};
FlatBufferBuilder fbb = new FlatBufferBuilder(factory);
fbb.clear();
fbb.putByteBuffer(java.nio.ByteBuffer.wrap(buffer));
// Read Flatbuffers data
if (errorOccurs) {
throw new FlatBuffersException("Error reading FlatBuffers data");
}
} catch (IOException e) {
throw new FlatBuffersException("Error reading file", e);
}
}
}
In the above code, an error occurs when reading the Flatbuffers data, and a custom Flatbuffersexception will be thrown out.By throwing an exception, the error message can be passed to the call party, and the caller can handle the corresponding processing according to the situation.
Summarize:
This article introduces errors and abnormalities when using Flatbuffers's Java API.By capturing and processing IOEXception exceptions, the program can avoid the collapse of the program and perform errors.In addition, you can customize abnormalities and throw abnormalities according to the situation to provide more detailed error information.Reasonable error treatment and abnormal mechanism are very important for ensuring the stability and reliability of the code.
