Doing that in separated functions that don't share logic or variables together is more difficult as you would need to store values in global variables or similar tricks.

Because of that, it's now recommended to instead use the `lifespan` as explained above.

## Technical Details { #technical-details }

Just a technical detail for the curious nerds. 🤓

	cred, owner, s3Err := validateAdminSignature(ctx, r, "")
	if s3Err != ErrNone {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL)
		return
	}

	// Now we have all the key names, for each of them, check whether the policy grants permission for
	// the user to list it. Filter in place to leave only allowed keys.
	n := 0
	for _, k := range allKeys {

	return cs.processors["raw"]
}

func (p *processor) Execute(db *DB) *DB {
	// call scopes
	for len(db.Statement.scopes) > 0 {
		db = db.executeScopes()
	}

	var (
		curTime           = time.Now()
		stmt              = db.Statement
		resetBuildClauses bool
	)

	if len(stmt.BuildClauses) == 0 {
		stmt.BuildClauses = p.Clauses
		resetBuildClauses = true
	}

* And many other things...

All these, while minimizing code repetition.

## First Steps { #first-steps }

Let's see a very simple example. It will be so simple that it is not very useful, for now.

But this way we can focus on how the **Dependency Injection** system works.

### Create a dependency, or "dependable" { #create-a-dependency-or-dependable }

Let's first focus on the dependency.

	// Distinguish these cases using the column number, since we don't
	// see the space itself. Note that text/scanner reports the position at the
	// end of the token. It's where you are now, and you just read this token.
	if tok == '(' && in.Stack.Col() == prevCol+1 {
		// Macro has arguments. Scan list of formals.
		acceptArg := true
		args = []string{} // Zero length but not nil.
	Loop:
		for {

	}

	if config.Logger == nil {
		config.Logger = logger.Default
	}

	if config.NowFunc == nil {
		config.NowFunc = func() time.Time { return time.Now().Local() }
	}

	if dialector != nil {
		config.Dialector = dialector
	}

	if config.Plugins == nil {
		config.Plugins = map[string]Plugin{}
	}

	if config.cacheStore == nil {

    }

    /**
     * Add or replace an artifact. This method is now deprecated. Use the @{MavenProjectHelper} to attach artifacts to a
     * project. In spite of the 'throws' declaration on this API, this method has never thrown an exception since Maven
     * 3.0.x. Historically, it logged and ignored a second addition of the same g/a/v/c/t. Now it replaces the file for

			"user":   user,
			"cmd":    s.Method,
			"param":  s.Filepath,
			"source": source,
		},
	}
}

func (m *sftpMetrics) log(s *sftp.Request, user string) func(sz int64, err error) {
	startTime := time.Now()
	source := getSource(2)
	return func(sz int64, err error) {
		globalTrace.Publish(sftpTrace(s, startTime, source, user, err, sz))
	}
}

// NewSFTPDriver initializes sftp.Handlers implementation of following interfaces

    private MessageBuilder builder() {
        return messageBuilderFactory.builder();
    }

    private void logStats(MavenSession session) {
        infoLine('-');

        Instant finish = MonotonicClock.now();

        Duration time = Duration.between(session.getRequest().getStartInstant(), finish);

        String wallClock = session.getRequest().getDegreeOfConcurrency() > 1 ? " (Wall Clock)" : "";

            }
            printWriter.accept(sb.toString());
        }
    }

    @Override
    public final Options interpolate(UnaryOperator<String> callback) {
        try {
            // now that we have properties, interpolate all arguments
            Interpolator interpolator = createInterpolator();
            CommandLine.Builder commandLineBuilder = CommandLine.builder();