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package liquibase;

/**
 * An alternative to {@link SingletonScopeManager} which manages a separate Scope per thread.


 * Integrations that would prefer to use this scope manager can call Scope.setScopeManager(new ThreadLocalScopeManager()).
 * 


 * The value of Scope.getCurrentScope() at the time of the ThreadLocalScopeManger's creation will be the basis of all scopes created after setScopeManager() is changed,
 * so you will generally want to setScopeManager as soon as possible.
 *
 * @deprecated ScopeManager now uses ThreadLocal to prevent concurrent modification issues. This class is no longer needed.
 */
@Deprecated
@SuppressWarnings("java:S5164")
public class ThreadLocalScopeManager extends ScopeManager {

    private final Scope rootScope;
    private final ThreadLocal threadLocalScopes = new ThreadLocal<>();

    public ThreadLocalScopeManager() {
        this(Scope.getCurrentScope());
    }

    public ThreadLocalScopeManager(Scope rootScope) {
        this.rootScope = rootScope;
    }

    @Override
    public synchronized Scope getCurrentScope() {
        Scope current = threadLocalScopes.get();

        if (current == null) {
            threadLocalScopes.set(rootScope);
            current = rootScope;
        }

        return current;
    }

    @Override
    protected synchronized void setCurrentScope(Scope scope) {
        this.threadLocalScopes.set(scope);
    }
    @Override
    protected Scope init(Scope scope) throws Exception {
        return rootScope;
    }


}