barber | custom view styling library for Android

You can do this:

I suggest something like the following, based on the assumption that the borrower's ID exists in the accounts array.

I'm not sure what you want to sort by, but the code below assumes you are sorting by company in ascending order; if it is not the case, you may adapt to fit your needs.

I'm not familiar with the business rules in your scenario, so this is a little bit of guess-work and a few assumptions which you can verify.

I assume the 'Add Product Inventory' Use Case is about adding products to an inventory of all products. For our purposes to answer your question, I don't think it matters whether this Use Case relates to adding one product, multiple products, managing products (e.g. editing or removing them), whether the inventory already exists or not, or if the Inventory is a separate thing to the Products on it, but answers to those questions are not 100% clear from your model and you may consider clarifying those points.

I also assume that a Product needs to be on the Inventory in order that it can be Purchased. If that is the case, then I think what you are asking is about this very point -- how do I represent the fact that the Product needs to be Added to the Inventory before it can be Purchased? If that is what you're asking, then you can represent that using a simple 'dependency' relationship which would run from the Purchase Product Use Case to the Add Product Inventory Use Case as per below. This states that the Product Purchase is somehow dependent on Add Product, but does not go further in explaining that relationship. Alternatively, you could use a preceedes relationship running instead from the Add to the Purchase. I don't think extend is the correct relationship -- the steps of Add Product don't need to be factored in every time you Purchase Product, the dependency is on the objective of Add Product having first been achieved, not the steps.

Excluding boilerplate code

You should call sectionList.add(new Section(document.getString("date"),apnmntList)); inside onComplete() call back method. Because this is a call back method is suspended and control jumps to execute code after call back code block. One more thing you should initialize apnmntList before for loop, because new list has to be saved for each Section. I have made changes to onComplete() method, just have a look :

You need to ensure that adapter has been given a value, before you call adapter.startListening on it.

That means that in onStart you need to ensure the adapter exists:

There are several mistakes in your program:

1. In the client code, you are calling sem_wait(pillow) and sem_post(pillow);, although the variable pillow has not been initialized. This causes undefined behavior. In order to initialize a semaphore, you can use the functions sem_init or sem_open.
2. In the client code, you release the mutex queue immediately after acquiring it. Instead, you should only release it when you are finished with the queue operation.
3. In the client code, you call push(waitroom, id) twice, the second call being immediately after the first call. This does not make sense.
4. In the barber's main loop, you are releasing the mutexes queue and barber without acquiring them beforehand, then acquire them afterwards. A mutex should normally first be acquired, then released, not the other way around. Use sem_wait for acquiring the mutex, sem_post for releasing it. EDIT: Meanwhile, I believe that you are using the semaphore barber for signalling purposes, not as a mutex. In that case, it is correct to call sem_post without having called sem_wait beforehand.
5. You are not checking the return value of sem_wait. For example, it is possible that the function fails due to being interrupted by a signal handler.
6. It is not safe to use the function printf in a signal handler. See this link for more information.
7. You are not waiting for the child processes to finish, before terminating the parent process.