AWS Lambda - 回调（"some error type"）等同于 Java 8
AWS Lambda - callback("some error type") equivalent in Java 8
如何让 lambda 函数在 Java 8 中报告失败？
我发现这在 Node.js 中是可能的。
http://docs.aws.amazon.com/lambda/latest/dg/nodejs-prog-model-handler.html
Using the Callback Parameter
The Node.js runtime v4.3 supports the optional callback parameter. You
can use it to explicitly return information back to the caller. The
general syntax is:
callback(Error error, Object result);
Where:
error – is an optional parameter that you can use to provide results
of the failed Lambda function execution. When a Lambda function >succeeds, you can pass null as the first parameter.
result – is an optional parameter that you can use to provide the result of a successful function execution. The result provided must be
JSON.stringify compatible. If an error is provided, this parameter is
ignored.
Note
Using the callback parameter is optional. If you don't use the
optional callback parameter, the behavior is same as if you called the
callback() without any parameters. You can specify the callback in
your code to return information to the caller.
If you don't use callback in your code, AWS Lambda will call it
implicitly and the return value is null.
When the callback is called (explicitly or implicitly), AWS Lambda
continues the Lambda function invocation until the Node.js event loop
is empty.
The following are example callbacks:
callback(); // Indicates success but no information returned to
the caller. callback(null); // Indicates success but no information
returned to the caller. callback(null, "success"); // Indicates
success with information returned to the caller. callback(error);
// Indicates error with error information returned to the caller.
AWS Lambda treats any non-null value for the error parameter as a
handled exception.
只是抛出一个异常，不要在任何地方捕获它。任何未捕获的异常都会导致 Lambda 失败。您可以通过 Java 查看有关如何在 AWS Lambda 中报告故障的更多信息：https://docs.aws.amazon.com/lambda/latest/dg/java-exceptions.html
public TestResponse handleRequest(TestRequest request, Context context) throws RuntimeException {
throw new RuntimeException("Error");
}
请注意 throws 声明，该声明允许在方法外抛出未处理的异常。
如何让 lambda 函数在 Java 8 中报告失败？
我发现这在 Node.js 中是可能的。
http://docs.aws.amazon.com/lambda/latest/dg/nodejs-prog-model-handler.html
Using the Callback Parameter
The Node.js runtime v4.3 supports the optional callback parameter. You can use it to explicitly return information back to the caller. The general syntax is:
callback(Error error, Object result);Where:
error – is an optional parameter that you can use to provide results of the failed Lambda function execution. When a Lambda function >succeeds, you can pass null as the first parameter.
result – is an optional parameter that you can use to provide the result of a successful function execution. The result provided must be JSON.stringify compatible. If an error is provided, this parameter is ignored.
Note
Using the callback parameter is optional. If you don't use the optional callback parameter, the behavior is same as if you called the callback() without any parameters. You can specify the callback in your code to return information to the caller.
If you don't use callback in your code, AWS Lambda will call it implicitly and the return value is null.
When the callback is called (explicitly or implicitly), AWS Lambda continues the Lambda function invocation until the Node.js event loop is empty.
The following are example callbacks:
callback(); // Indicates success but no information returned tothe caller. callback(null); // Indicates success but no informationreturned to the caller. callback(null, "success"); // Indicatessuccess with information returned to the caller. callback(error);
// Indicates error with error information returned to the caller.AWS Lambda treats any non-null value for the error parameter as a handled exception.
只是抛出一个异常，不要在任何地方捕获它。任何未捕获的异常都会导致 Lambda 失败。您可以通过 Java 查看有关如何在 AWS Lambda 中报告故障的更多信息：https://docs.aws.amazon.com/lambda/latest/dg/java-exceptions.html
public TestResponse handleRequest(TestRequest request, Context context) throws RuntimeException {
throw new RuntimeException("Error");
}
请注意 throws 声明，该声明允许在方法外抛出未处理的异常。