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Using an ArrayList as a datasource in an ephemeral Spring Boot project

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0

I am building a REST provider with Spring Boot. It is ephemeral by design i.e. the data can be lost when the application is killed. So, I decided to use an ArrayList to make CRUD operations on: it should be like a singleton -created with the app and used along the way.

I have this rest controller, with the service layer autowired:

@RestController
public class MyController 

 @Autowired
 private MyServiceInterface myService;

 @GetMapping(produces = MediaType.APPLICATION_JSON_VALUE)
 public List<MyEntity> retrieveAll() 
 return myService.getAll();
 

 @PostMapping(consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
 public MyEntity create(@RequestBody MyEntity entity) 
 return myService.insert(entity);
 

and the MyService implementing MyServiceInterface is as follows:

@Service
public class MyService implements MyServiceInterface 

 // This is my ArrayList to live while the Spring Boot app runs
 private List<MyEntity> myList = new ArrayList<MyEntity>();

 @Override
 public MyEntity insert(MyEntity entity) 
 this.myList.add(entity);
 return entity;
 

 @Override
 public List<MyEntity> getAll() 
 return this.myList;
 

So, is it fine to use a humble private myList object in the serive class as shown above, or should I take a different approach (inject that myList after assigning it as a @Bean, add @Configuration or whatsoever Spring stuff)?

EDIT: Not to sail away from my concern, my primary point is not discussing databases instead of lists, but how to declare a variable used by multiple methods of a Spring Bean.

java spring spring-boot

share|improve this question

edited Mar 8 at 23:01

vahdet

asked Mar 8 at 22:07

vahdetvahdet

2,29951636

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Forgot to state that, just added to question: any kind of database (in-memo, rdbms, so on) is not allowed
  
  – vahdet
  Mar 8 at 22:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  isn't your list an in memory list? you also do not want to use an array list because it's not thread safe
  
  – Taugenichts
  Mar 8 at 22:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Apart from the thread-safety (which is a good point of yours), I mean third party in-memory data grid solutions.
  
  – vahdet
  Mar 8 at 22:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unless you need to share data across multiple instances of your program, I think any kind of data grid is overkill. Data structures that just need to exist ephemerally inside a single process are a great use of Python's build in data structures. You can deal with the thread safety without bringing in complexity of some sort of data grid module. - if you ARE talking about sharing across processes, then Redis is a great solution. Very simple to use. But it requires external setup. Not at all necessary for a single process that doesn't need to preserve it's data across restarts.
  
  – Steve
  Mar 8 at 22:23
  
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  ah, ok. well, it doesn't matter much how your list comes into existence. No need to fancy it up with spring injection unless there's some external reason to do that, like mocking for testing or something like that. whatever gets it done is probably fine. In terms of thread safety, it depends on how efficient you need to be. A basic solution is that you can turn many non-thread-safe java classes into thread safe ones with something like this: List newList = Collections.synchronizedList(new ArrayList());
  
  – Steve
  Mar 8 at 22:31
  

  
  
  
  

 | 
show 7 more comments

0

I am building a REST provider with Spring Boot. It is ephemeral by design i.e. the data can be lost when the application is killed. So, I decided to use an ArrayList to make CRUD operations on: it should be like a singleton -created with the app and used along the way.

I have this rest controller, with the service layer autowired:

@RestController
public class MyController 

 @Autowired
 private MyServiceInterface myService;

 @GetMapping(produces = MediaType.APPLICATION_JSON_VALUE)
 public List<MyEntity> retrieveAll() 
 return myService.getAll();
 

 @PostMapping(consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
 public MyEntity create(@RequestBody MyEntity entity) 
 return myService.insert(entity);
 

and the MyService implementing MyServiceInterface is as follows:

@Service
public class MyService implements MyServiceInterface 

 // This is my ArrayList to live while the Spring Boot app runs
 private List<MyEntity> myList = new ArrayList<MyEntity>();

 @Override
 public MyEntity insert(MyEntity entity) 
 this.myList.add(entity);
 return entity;
 

 @Override
 public List<MyEntity> getAll() 
 return this.myList;
 

So, is it fine to use a humble private myList object in the serive class as shown above, or should I take a different approach (inject that myList after assigning it as a @Bean, add @Configuration or whatsoever Spring stuff)?

EDIT: Not to sail away from my concern, my primary point is not discussing databases instead of lists, but how to declare a variable used by multiple methods of a Spring Bean.

java spring spring-boot

share|improve this question

edited Mar 8 at 23:01

vahdet

asked Mar 8 at 22:07

vahdetvahdet

2,29951636

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Forgot to state that, just added to question: any kind of database (in-memo, rdbms, so on) is not allowed
  
  – vahdet
  Mar 8 at 22:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  isn't your list an in memory list? you also do not want to use an array list because it's not thread safe
  
  – Taugenichts
  Mar 8 at 22:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Apart from the thread-safety (which is a good point of yours), I mean third party in-memory data grid solutions.
  
  – vahdet
  Mar 8 at 22:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unless you need to share data across multiple instances of your program, I think any kind of data grid is overkill. Data structures that just need to exist ephemerally inside a single process are a great use of Python's build in data structures. You can deal with the thread safety without bringing in complexity of some sort of data grid module. - if you ARE talking about sharing across processes, then Redis is a great solution. Very simple to use. But it requires external setup. Not at all necessary for a single process that doesn't need to preserve it's data across restarts.
  
  – Steve
  Mar 8 at 22:23
  
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  ah, ok. well, it doesn't matter much how your list comes into existence. No need to fancy it up with spring injection unless there's some external reason to do that, like mocking for testing or something like that. whatever gets it done is probably fine. In terms of thread safety, it depends on how efficient you need to be. A basic solution is that you can turn many non-thread-safe java classes into thread safe ones with something like this: List newList = Collections.synchronizedList(new ArrayList());
  
  – Steve
  Mar 8 at 22:31
  

  
  
  
  

 | 
show 7 more comments

I am building a REST provider with Spring Boot. It is ephemeral by design i.e. the data can be lost when the application is killed. So, I decided to use an ArrayList to make CRUD operations on: it should be like a singleton -created with the app and used along the way.

I have this rest controller, with the service layer autowired:

@RestController
public class MyController 

 @Autowired
 private MyServiceInterface myService;

 @GetMapping(produces = MediaType.APPLICATION_JSON_VALUE)
 public List<MyEntity> retrieveAll() 
 return myService.getAll();
 

 @PostMapping(consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
 public MyEntity create(@RequestBody MyEntity entity) 
 return myService.insert(entity);
 

and the MyService implementing MyServiceInterface is as follows:

@Service
public class MyService implements MyServiceInterface 

 // This is my ArrayList to live while the Spring Boot app runs
 private List<MyEntity> myList = new ArrayList<MyEntity>();

 @Override
 public MyEntity insert(MyEntity entity) 
 this.myList.add(entity);
 return entity;
 

 @Override
 public List<MyEntity> getAll() 
 return this.myList;
 

So, is it fine to use a humble private myList object in the serive class as shown above, or should I take a different approach (inject that myList after assigning it as a @Bean, add @Configuration or whatsoever Spring stuff)?

EDIT: Not to sail away from my concern, my primary point is not discussing databases instead of lists, but how to declare a variable used by multiple methods of a Spring Bean.

java spring spring-boot

share|improve this question

edited Mar 8 at 23:01

vahdet

asked Mar 8 at 22:07

vahdetvahdet

2,29951636

@RestController
public class MyController 

 @Autowired
 private MyServiceInterface myService;

 @GetMapping(produces = MediaType.APPLICATION_JSON_VALUE)
 public List<MyEntity> retrieveAll() 
 return myService.getAll();
 

 @PostMapping(consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
 public MyEntity create(@RequestBody MyEntity entity) 
 return myService.insert(entity);
 

@Service
public class MyService implements MyServiceInterface 

 // This is my ArrayList to live while the Spring Boot app runs
 private List<MyEntity> myList = new ArrayList<MyEntity>();

 @Override
 public MyEntity insert(MyEntity entity) 
 this.myList.add(entity);
 return entity;
 

 @Override
 public List<MyEntity> getAll() 
 return this.myList;
 

share|improve this question

edited Mar 8 at 23:01

vahdet

asked Mar 8 at 22:07

vahdetvahdet

2,29951636

share|improve this question

edited Mar 8 at 23:01

vahdet

asked Mar 8 at 22:07

vahdetvahdet

2,29951636

asked Mar 8 at 22:07

vahdetvahdet

2,29951636

asked Mar 8 at 22:07

vahdetvahdet

2,29951636