All Questions
52 questions
1
vote
3
answers
406
views
Singleton MongoClient instance provider
A Java service that connects to MongoDB in production, but opened connection count is too much. It affects on MongoDb performance, so I have come up with a solution that provides only one ...
- 162
2
votes
0
answers
157
views
SharedPreferences singleton wrapper
I was wondering wether my implementation of the PreferenceService below is thread safe or could cause memory leaks.
Android Studio gives me the warning "Do not place Android context classes in ...
- 121
1
vote
1
answer
103
views
Using enum for singleton implementations to choose way of doing something
I have this service that reads emails from a mailbox as they come and I want to extract its contents in a map structure. For now I am interested only in the actual email (no images or attachments).
I ...
- 191
4
votes
3
answers
7k
views
Simple Publisher Subscriber in Java
I am new to Java and had some difficulty creating this simple Publisher Subscriber class. It finally seems to be working and I wanted to check if I have been following best practices and see if there ...
- 171
0
votes
2
answers
1k
views
Storing singleton instances in a generic utils class
In one of my java projects I use singletons a lot and I was looking for a way to reduce repeating code. I made a SingletonUtils class that accepts a class and ...
- 135
3
votes
1
answer
2k
views
Implementation of an OkHttp singleton for Android
I'm new to Android programming. I am going to make lots of HTTP requests: 500, 1k, 2k, 10k.
I have tried to create a singleton class for OkHttp. I wrote this:
...
- 33
3
votes
1
answer
3k
views
Attempting to make my properties an enum based singleton
I was attempting to implement my first singleton using an enum, was a bit of a struggle for me and I'm not sure if its right and more importantly thread safe?
Property provider enum:
...
- 161
3
votes
1
answer
4k
views
Static class for constants with reference to java resources
I want to store the colors I use in the colors.xml file. In addition to using them in an xml-layout, I also want to use these colors in my Java code, when drawing ...
- 143
0
votes
2
answers
295
views
Create another Singleton object from a Singleton class
I want to create a singleton object of a third party caching library (ThirdPartyKVStore). But I don't want to reference this class all over the place from where I ...
- 101
0
votes
3
answers
6k
views
Java Singleton getter/setter
I've created working setters/getters for an application, that will use a few different classes. This classes will use one class, that will store all data. I know, when I will use a standard ...
- 53
1
vote
1
answer
1k
views
Singleton with a volatile and synchronized instance
I created a singleton to have a unique instance of ExecutorService in my application.
I whould like to know which is the better of the two classes below.
First one :
...
- 113
1
vote
2
answers
4k
views
Java MongoDB client as a singleton
Is below code a valid Singleton design pattern for Mongodb in Java?
Please suggest any improvements.
...
- 163
5
votes
1
answer
1k
views
Singletons with eager and lazy instantiation
I've found more than one implementation of the Singleton Pattern in Java (more like 5-6). I want to know if both of the following snippets of code (written by me) are valid implementations of ...
- 127
3
votes
1
answer
3k
views
Log4j Singleton
I'm trying to design and develop a singleton class that will handle resolution and configuration of log4j (not log4j2). The basic idea is to have a single class, reusable in any application, that ...
- 191
1
vote
1
answer
124
views
Is this a good and simple example for Singleton Pattern [closed]
This is a scenario where we keep a single instance(as in Singleton Pattern) to get the configuration of an application.
Below is the main class and i set values to the configuarion values here and ...
- 113