Tag: git

Improve Git Monorepo Performance

Today, I was exploring source code of the Gitlab project and experienced poor performance of the git status command. Gitlab is an open source alternative to Github.

Below is the output of git status command

 time git status

On branch master
Your branch is ahead of 'origin/master' by 1 commit.
  (use "git push" to publish your local commits)

nothing to commit, working tree clean
git status  0.20s user 1.13s system 88% cpu 1.502 total

The total here is the number of seconds it took for the command to complete.

The same was the case for the git add command.

time git add .

git add .  0.21s user 1.11s system 115% cpu 1.146 total

So both commands took more than a second to finish.

These commands are slow because they need to search the entire worktree looking for changes. When the worktree is very large, Git needs to do a lot of work.

Continue reading “Improve Git Monorepo Performance”

TIL #3: Exclude null fields in Spring Boot REST JSON API, Serializing Enum value with Jackson, and Change remote for a branch in Git

The three things that I learned today are mentioned below.

Learning 1: Exclude null fields in Spring Boot REST JSON API response

Spring Boot uses Jackson to convert to JSON. Spring Boot allows you to configure through a configuration property whether you want to include null values or not. By default, serialised JSON will include null values as well. To remove null values, you should use following property add it to your application.properties.

spring.jackson.default-property-inclusion=NON_NULL

If you are using Java 8 or Google’s Gauva and want to exclude Optional type as well then you should use NON_ABSENT value.

spring.jackson.default-property-inclusion=NON_ABSENT

To learn about all the values, you should look at Jackson’s com.fasterxml.jackson.annotation.JsonInclude.Include enumeration.

Learning 2: Serializing Enum value with Jackson

The second learning that I had today was around how to properly serialize enum values in Jackson. I had enum shown below

public enum Status {
    SUCCESS("success"), ERROR("error");

    private final String status;

    Status(String status) {
        this.status = status;
    }
}

I wanted my JSON structure to be as shown below.

{
  "status": "success"
}

To achieve that you have to Jackson’s @JsonCreator and @JsonValue annotation as shown below.

public enum Status {
    SUCCESS("success"), ERROR("error");

    private final String status;

    @JsonCreator
    Status(String status) {
        this.status = status;
    }

    @JsonValue
    public String getStatus() {
        return this.status;
    }
}

Learning 3: Change remote of a branch in Git

$ git branch develop --set-upstream-to=upstream/develop

You can view remote tracked by local branch using the following command.

$ git branch -lvv