Computer data logging is the process of recording events in a computer program, usually with a certain scope, in order to provide an audit trail that can be used to understand the activity of the system and to diagnose problems.

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473 views

Is storing stack traces in database recommended?

The current system I am working on goes through a set of documents & performs some logic using the metadata of the document. If the metadata of a document is fishy..it throws an exception. The ...
2
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2answers
145 views

Where should tests' log files go?

My application has a rather non-trivial, yet standard, log configuration. It includes a console appender and a rolling size-based file appender. When I'm running the tests, thru the IDE or with ...
3
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1answer
87 views

An extensible logging architecture for Android?

The end goal is to have a variety of data sets that can all be graphically plotted against eachother. All data should correspond to a date, so that when plotted against each other, they show the ...
1
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1answer
983 views

How to design a log() method that can easily be accessed from the outside of the Console class?

Recently my team has programmed a custom developer console in a video game which can easily be hidden or displayed, because it's more comfortable and less of a hassle. The Console class contains a ...
2
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2answers
305 views

When is it okay to log filename/line information for errors?

We have a closed-source commercial C++ application. Some of our logged error messages are in plain English like "ERROR: could not read file 'foo'". While others use a macro to print filename/line ...
3
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5answers
2k views

Is SQLite a sensible option for data logging?

I am trying to setup a small data-logging application under linux. The data arrives via serial port, and from there it should be pumped to logging and to graphical display. The logging functionality ...
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2answers
4k views

How to do logging in console application [closed]

I have a simple console application that will be deployed as a scheduled job. Below is its pseudo code Main(string[] args) { //get xml string from database Reports reports = ...
1
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3answers
453 views

Maintaining log stream after file name change

I'm trying to log to a file and move it about every 30 seconds. I'm using the os.rename function (which I do from a supervisord process) in python to move the current log to a timestamped log (which ...
2
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1answer
353 views

What is the best way to track / record the current programming project you work on? [duplicate]

I have been in this problem for long time and I want to know how it's done in real / big companies project? Suppose I have the project to build a website. Now I divide the project into sub tasks and ...
1
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1answer
85 views

Is there any reason not to include issue numbers in debug logs?

I was going through the answers to this question: What information must never appear in logs? And noticed that nobody mentioned this particular attribute. It's something I find useful- whenever any ...
-1
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3answers
393 views

Good logging technique for small projects on Java [duplicate]

When I'm coding small projects, I often use System.out.println to print valuable info. It's simple, easy and gets me info. The only drawback I found is that there is no simple way to disable parts of ...
1
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2answers
251 views

Event based logging. Is it a good idea and is it ok to pass a handle to a “logged” object?

Hi I have fairly complex program that is doing computations in a quite large loop. I want to log some basic statistic about the run to be able to analyze its performance over time and vs loop number. ...
2
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3answers
138 views

Forcing logger/appender to output line logged at lower than its current level?

Consider the following scenario: I am writing a Dispatcher Servlet that delegates processing to various handlers depending on the request URL; the handler objects having previously registered ...
1
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2answers
593 views

log4cxx: is it a stable option to include as part of distributed library? [closed]

We are porting our Java API library to C++. (Our target platforms are Linux and Windows.) Since we have minimal C++ experience, the learning curve has been pretty steep, but overall we have been able ...
3
votes
3answers
1k views

C++ log every function and parameter values

I want to log every function call and parameter value in my C++ app. Is there a generic approach for this task ? (3rd part library, VAR_ARGS etc.)
4
votes
2answers
2k views

Design pattern for logging changes in parent/child objects saved to database

I’ve got a 2 database tables in parent/child relationship as one-many. I’ve got three classes representing the data in these two tables: Parent Class { Public int ID {get; set;} .. other ...
1
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1answer
239 views

How to unit test a class which is just an adapter that logs input and output to a third-party library?

I have the following (in C#, but the question could also apply to Java): public interface ILibraryAdapter { string Property1 { get; } string Method1(string param1); ... } public class ...
4
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2answers
545 views

Log design approach

Logging was always a nightmare for me! Now I have to implement it again for a proxy system. In this proxy application, some systems ask proxy system to call some other services. What I have to log is ...
5
votes
2answers
215 views

Is it fine to use logs in the Helper Methods?

I have been doubting for a long time whether or not to have a logger in methods (usually helper methods) like the one below. Whether we can print it in the method or print the response where the ...
1
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1answer
611 views

What factors should I consider when logging a (JSF) web-app?

I've recently read the article The Problem with logging and was wondering about my current logging strategy. Usualy I use Log4J in my projects and just have to decide which line/attributes I would ...
0
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1answer
153 views

Design patterns to avoiding breaking the SRP while performing heavy data logging

A class that performs both computations and data logging seems to have at least two responsibilities. Given a system for which the specifications require heavy data logging, what kind of design ...
1
vote
3answers
869 views

Opinions on logging in multiprocess applications

We have written an application that spawns at least 9 parallel processes. All processes generate a lot of logging information. Currently we are using Pythons QueueHandler to consolidate all logs ...
1
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1answer
133 views

Strategy for clients to retrieve real-time log from HTTP server

I have an HTTP Server Service application which has its own logging mechanism. It's written in Delphi. I would like to provide a way for multiple clients to connect to this service and get a real-time ...
18
votes
4answers
9k views

What is the correct way to handle debug output in Java?

As my current Java projects grow bigger and bigger, I feel a likewise growing need to insert debug output in several points of my code. To enable or disable this feature appropriately, depending on ...
6
votes
3answers
2k views

Exception Handling Frequency/Log Detail

I am working on a fairly complex .NET application that interacts with another application. Many single-line statements are possible culprits for throwing an Exception and there is often nothing I can ...
5
votes
2answers
424 views

Logging in JSON Effect on Performance

I see more and more articles about logging in JSON. You can also find one on NodeJS blog. Why does everyone like it so much? I can only see more operations getting involved: A couple new objects ...
4
votes
1answer
988 views

Best Creational Pattern for loggers in a multi-threaded system?

This is a follow up question on my past questions : Concurrency pattern of logger in multithreaded application As suggested by others, I am putting this question separately. As the learning from ...
7
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2answers
573 views

Concurrency pattern of logger in multithreaded application

The context: We are working on a multi-threaded (Linux-C) application that follows a pipeline model. Each module has a private thread and encapsulated objects which do processing of data; and each ...
10
votes
7answers
14k views

Best practices for logging user actions in production

I was planning on logging a lot of different stuff in my production environment, things like when a user: Logs In, Logs Off Change Profile Edit Account settings Change password ... etc Is this a ...
2
votes
1answer
506 views

tail-like view on HTML logfiles

I'm working on an application that creates HTML log files. I'm tired of having to manually reload and scroll to the bottom in the browser to see the latest entries. A solution that does not really ...
5
votes
2answers
163 views

Database Change Auditing - Part of or Abstracted from ORM / Application Layer?

My fellow developers and I are at a crossroads in how to go about continuing our auditing of database changes. Most of our applications log changes via INSERT, UPDATE, and DELETE triggers. A few of ...
7
votes
6answers
2k views

Rules and advice for logging?

In my organization we've put together some rules / guildelines about logging that I would like to know if you can add to or comment. We use Java but you may comment in general about loggin - rules ...
7
votes
5answers
314 views

Is there a pattern or logical structure I can follow for Event Log Numbers?

What are some ideas or structure I can use when assigning EventID to events that will be saved to the Windows Event Log? Some options I've considered Sequential (0... int.Max) Multiple of ...
6
votes
4answers
370 views

Logging errors caused by exceptions deep in the application

What are best-practices for logging deep within an application's source? Is it bad practice to have multiple event log entries for a single error? For example, let's say that I have an ETL system ...
1
vote
3answers
549 views

Logging asynchronously - how should it be done?

In many of the services I work on there are a lot of logging being done. The services are WCF services(mostly) which use the .NET EventLogger class. I'm in the process of improving these services' ...
21
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2answers
1k views

Should You Log From Library Code?

If I am developing a Java library, is it good practice to issue log statements from within the library's code? Having logging within the library will make debugging and troubleshooting more ...
1
vote
3answers
94 views

Communicating details of method result?

I have code like this (pseudocode) foreach(Box box in boxes) { if(boxFilter.PassesFilter(box)) { // do something useful } else { Log.Log(format("Box %s was rejected", ...
5
votes
3answers
319 views

What should I do with production error logs?

We have a PHP intranet site that we run with warning/error logging on (as it's not under heavy load and there's a number of bugs/bad code left to find). Because the site is relatively unstable and in ...
10
votes
6answers
1k views

Need to make my code more readable to the other programers in my team

I am working a project in delphi 7 and I am creating a installer for the application, there are Three main parts. PostgreSQL installation/uninstallation myapplication ( setup of myapplication is ...
18
votes
6answers
40k views

Why doesn't “object reference not set to an instance of an object” tell us which object?

We're launching a system, and we sometimes get the famous exception NullReferenceException with the message Object reference not set to an instance of an object. However, in a method where we have ...
3
votes
2answers
195 views

What percentage of code and runtime do you typically allow for testing?

When I write code, a certain amount of it is just for the purpose of logging, tracing, or otherwise "testing" what the program is doing. This not unit testing; this is not when it is running in ...
2
votes
3answers
84 views

Allowing the user to specify the location of a logfile

I'm working on an application, and adding logging, but now I'm stuck. I want to allow (not force!) the user to set the location of the logfile. Basically, my problem is: logger initialization ...
7
votes
2answers
471 views

How should I handle logging when I create libraries for others?

All. I am creating some libraries for other teams in my company. They all have different logging mechanisms. I want to provide trace information of what my libraries are doing. What should I to ...
13
votes
2answers
1k views

Is it more sensible to log exceptions in a catch-all or in a base exception class?

I'm in the process of refactoring a fairly large web app. One of the major issues is inconsistent error handling and I'm trying to come up with a sensible strategy. I've created a custom error ...
3
votes
3answers
179 views

Filesystems that use logging: If you're writing the data in the log (on disk), and in the actual locations themselves (also on disk) then…?

Aren't you essentially writing the same data twice, to the disk? Doesn't this cause a slowdown of a factor of ~2x? What optimizations can be made to minimize the cost of having to write things twice? ...
46
votes
9answers
4k views

What are some patterns and anti-patterns of application logging? [closed]

I recently had to investigate a field issue for our large enterprise application. I was horrified by the logs that I had to comb through in an attempt to find the problem and at the end of the day the ...
5
votes
3answers
265 views

Multitasking how to keep track of what you're doing

I'm in a long debugging task, I need to figure out where to hook up some extra functionality I need. It's cumbersome work, and I've been debugging 2 whole days, and I'm on my third, but I work in ...
7
votes
11answers
696 views

Is it practical to use Twitter for service logs?

Recently my boss suggested that we post logs of our service that is hosted on Windows Azure into twitter. His idea is that it's conveniently readable and if Azure cloud fails logs persist. He also ...
2
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2answers
1k views

Centralized and decentralized logging mechanisms

I've worked different kind of applications both having centralized and decentralized logging mechanisms. I feel centralized logging mechanism is good to see the proper flow of code and timing of ...
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votes
3answers
310 views

What's the meaning of “the Sun defect” and how does it differ from the more generic “NIH syndrome”? [closed]

I hear people talking about the "Sun defect", often giving the whole mess around logging as an example. How is it different from the not-invented-here syndrome, which means uselessly duplicating ...