mantra | A professional web animation tool for everyone | Animation library
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QUESTION
Thinking that I wanted to clear out old logs, I made the mistake of deleting my Lambda's "Log Stream" on CloudWatch.
The result, as I should have expected if I was awake, is that now CloudWatch isn't getting the Lambda's console logs at all. Oops.
The log group still exists. I can see how to create a new log stream.
What I haven't been able to find on the web is clear instructions to get the existing Lambda to output to this new stream... ie, to repair what I did.
Can someone provide instructions or a pointer to them, please? I'm sure I'm not the only one who's made this mistake, so I think it's an answer worth having on tap.
UPDATE: Decided to try recovering by creating an entirely new Lambda, running the same code and configured the same way, expecting that it would Just Work; my understanding was that a new Lambda binds to a CloudWatch group automagically.
Then I ran my test, clicked the twist-arrow to see the end of the output, and hit "Click here to view the corresponding CloudWatch log group.". It opened Cloudwatch looking at the expected log group name -- with a big red warning that this group did not exist. Clicking "(Logs)" at the top of the test output gave the same behavior.
I tried creating the group manually, but now I'm back where I was -- lambda runs, I get local log output, but the logs are not reaching CloudWatch.
So it looks like there's something deeper wrong. CloudWatch is still getting logs from the critical lambda (the one driving my newly-released Alexa skill), and the less-critical one (scheduled update for the skill's database) is running OK so I don't absolutely need its logs right now -- but I need to figure this out so I can read them if that background task ever breaks.
Since this is now looking like real Unexpected Behavior rather than user error, I'll take it to the AWS forums and post here if they come up with an answer. On that system, the question is now at https://repost.aws/questions/QUDzF2c_m0TPCwl3Ufa527Wg/lambda-logging-to-cloud-watch-seems-to-be-broken
Programmer's mantra: "If it was easy, they wouldn't need us..."
...ANSWER
Answered 2022-Mar-25 at 21:09After a Lambda function is executed, you can go to the Monitoring tab and click View logs in CloudWatch -- it will take you to the location where the logs should be present.
If you know that the function has executed but no logs are appearing, then confirm that your Lambda function has the AWSLambdaBasicExecutionRole
assigned to the IAM Role being used by the Lambda function. This grants permission for the Lambda function to write to CloudWatch Logs.
QUESTION
I want to write a simple method to print an array - looking like an array - with its elements in the terminal, independent of whether it is an int[], boolean[], String[], double[] etc.
The String info
parameter is just meant to output some answer phrase with the array shown, like "The wanted array is { .... }"
.
I am aware that in Java
- unspecified parameter types should be handled with extreme care
- primitive variable types cannot easily be used with generic data types
- the usual answer for accepting different parameter types is overloading (which I finally did),
but the only difference between the different versions of the method printArray(...)
is the variable type of the array handed over in the parameter list.
I also tried to hand over an object[] pArray
as a parameter, but then it would only accept integer arrays, or give a runtime error message.
A similar concept is addressed in the answers to the former post Parameter For All Primitive Types of Java?, but - although it is pretty much the same question - the answers don't give solutions for arrays of simple primitives. They only answer
- ways to find out, which parameter type was used, or
- are limited to object types (including wrapper classes) or Number-objects, but which both don't solve my problem.
Looking at this the mantra "avoid code duplication" seems to be so obviously violated that I believe there must be a better solution.
Can anyone help me with this? Here is the code:
...ANSWER
Answered 2022-Feb-12 at 01:27Yes. But the only common ancestral type for all arrays1 is Object
. You can use that and java.lang.reflect.Array
. Also since printArray
has no state, you might as well make it static
like
QUESTION
My question is this, where do I put the methods mentioned above? Because in each component in which I want to use the Redux store, I need to basically repeat the mantra of,
...ANSWER
Answered 2021-Nov-29 at 16:45The answer is, don't.
bindActionCreators
was really only ever used internally by the React-Redux connect
function and not generally used by app code.
Today, with the React-Redux hooks API, we recommend just manually writing:
QUESTION
I am unable to get the data from mantra aeps device in OnActivityResult. I am successfully sending the PID options and device is also blanking and scanning the finger but not getting the data. I am using below code to get the data.
String result = data.getStringExtra("PIDDATA");
...ANSWER
Answered 2021-Oct-05 at 11:34First of all you are using the wrong name. It should be
QUESTION
TL;DR I want to have the functionality where a channel has two extra fields that tell the producer whether it is allowed to send to the channel and if so tell the producer what value the consumer expects. Although I know how to do it with shared memory, I believe that this approach goes against Go's ideology of "Do not communicate by sharing memory; instead, share memory by communicating."
Context:
I wish to have a server S that runs (besides others) three goroutines:
- Listener that just receives UDP packets and sends them to the demultplexer.
- Demultiplexer that takes network packets and based on some data sends it into one of several channels
- Processing task which listens to one specific channel and processes data received on that channel.
To check whether some devices on the network are still alive, the processing task will periodically send out nonces over the network and then wait for k seconds. In those k seconds, other participants of my protocol that received the nonce will send a reply containing (besides other information) the nonce. The demultiplexer will receive the packets from the listener, parse them and send them to the processing_channel
. After the k seconds elapsed, the processing task processes the messages pushed onto the processing_channel
by the demultiplexer.
I want the demultiplexer to not just blindly send any response (of the correct type) it received onto the the processing_channel
, but to instead check whether the processing task is currently even expecting any messages and if so which nonce value it expects. I made this design decision in order to drop unwanted packets a soon as possible.
My approach:
In other languages, I would have a class with the following fields (in pseudocode):
...ANSWER
Answered 2021-May-22 at 17:31Yes, the approach described by you doesn't align with Golang's Idiomatic way of implementation. And you have rightly pointed out that in the above approach you are communicating by sharing memory.
To achieve this in Go's Idiomatic way, one of the approaches could be that your Demultiplexer
"remembers" all the processing_channels
that are expecting nonce and the corresponding type of the nonce. Whenever a processing_channels
is ready to receive a reply, it sends a signal to the Demultiplexe
saying that it is expecting a reply.
Since Demultiplexer
is at the center of all the communication it can maintain a mapping between a processing_channel
& the corresponding nonce it expects. It can also maintain a "registry" of all the processing_channels
which are expecting a reply.
In this approach, we are Sharing memory by communicating
For communicating that a processing_channel
is expecting a reply, the following struct
can be used:
QUESTION
I want to sort a json data using javascript, the condition is user will enter a input value and based on the input value occurrence in json array I want to display a output. for example: If user input is userInput ="Man" & the json data is
...ANSWER
Answered 2021-May-20 at 17:56The easiest way would be to go through the list of strings and make a new array full of the strings that start with the user input. Then we can sort the matches and append the array of none matching strings to this list.
QUESTION
This is probably a pretty straight forward question but for some reason I haven't been able to find an answer on the great interwebs so far.
When using global variables, I know global variables are bad and should for the most part be avoided, but on those rare occasions where a global variable gets the job done best, should the global variable be both declared and initialized at once? I have been recently trying to drill into my head the mantra "always initialize variables upon declaration when possible" since this usually saves many headaches later and is encouraged with C++. Does this rule apply to global variables as well though?
If you initialize a variable in its global scope when declaring it, how does this affect the program? Is this best practice?
You're advice is very much appreciated!
...ANSWER
Answered 2021-Feb-27 at 17:47Yes, you do want to initialize global variables. As @paladin commented, if you do not initialize them, the compiler will attempt to initialize them with the default values. Consider this simple example:
QUESTION
I have this html-code generated from a xml-file which is generated from latex code and I can't change the html output. I work on an indological edition of an anient yoga text. I not just want to have a nice latex document for printing my edition. I want to also have a web edition simultanously. So my lualatex code is processed putting out an xml-file which a xslt2 processor processes to an html file. This is the html:
...ANSWER
Answered 2021-Jan-31 at 18:02Do you need such a result?
QUESTION
Multiple, perhaps most, language implementations that include a compiler at runtime neglect to garbage-collect discarded code (See, for example julia, where this leads to memory leaks in applications like genetic-programming)
My preliminary tests indicate that Chez Scheme does not leak memory here, but I would like to know with greater certainty, since I don't even know if f
and g
actually get compiled. (The old mantra: "Tests can only prove the presence of bugs, not their absence")
The test I tried: f
and g
call each other, and their definitions get replaced at runtime.
ANSWER
Answered 2020-Dec-24 at 07:31Given the importance of both procedures and garbage collection to Scheme, I would be surprised if Chez Scheme did not try to garbage collect any dynamically created objects. The R6RS Standard says [emphasis mine]:
All objects created in the course of a Scheme computation, including procedures and continuations, have unlimited extent. No Scheme object is ever destroyed. The reason that implementations of Scheme do not (usually!) run out of storage is that they are permitted to reclaim the storage occupied by an object if they can prove that the object cannot possibly matter to any future computation.
A procedure is an object, and any object may be garbage collected if the implementation can prove that the computation will not need it again. This is not a requirement, but that goes for any object, not just for procedures.
The Chez Scheme manual seems definitive, though (Chez Scheme Version 9 User's Guide, p. 82):
Since all Scheme objects, including code objects, can be relocated or even reclaimed by the garbage collector....
In the 1990s Kent Dybvig wrote a paper together with David Eby and Carl Bruggeman which may be of interest here, called Don’t Stop the BIBOP: Flexible and Efficient Storage Management for Dynamically Typed Languages, which describes the garbage collection strategy implemented in Chez Scheme. In the paper some time is spent discussing "code objects" and in particular how they are segregated and treated differently during the garbage collection process (since they may contain pointers to other objects).
QUESTION
This is my script, I wanna log in to google using selenium.
...ANSWER
Answered 2020-Dec-24 at 13:59Based on my testing, it turns out that this problem is caused by VNC that I am using. I don't know the exact problem. However, the error I mentioned above didn't occur and my script was running normally after I install this package:
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