AbstractReferenceCounted Class — netty Architecture

Source Code

common/src/main/java/io/netty/util/AbstractReferenceCounted.java lines 23–77

public abstract class AbstractReferenceCounted implements ReferenceCounted {

    private final RefCnt refCnt = new RefCnt();

    @Override
    public int refCnt() {
        return RefCnt.refCnt(refCnt);
    }

    /**
     * An unsafe operation intended for use by a subclass that sets the reference count of the object directly
     */
    protected void setRefCnt(int refCnt) {
        RefCnt.setRefCnt(this.refCnt, refCnt);
    }

    @Override
    public ReferenceCounted retain() {
        RefCnt.retain(refCnt);
        return this;
    }

    @Override
    public ReferenceCounted retain(int increment) {
        RefCnt.retain(refCnt, increment);
        return this;
    }

    @Override
    public ReferenceCounted touch() {
        return touch(null);
    }

    @Override
    public boolean release() {
        return handleRelease(RefCnt.release(refCnt));
    }

    @Override
    public boolean release(int decrement) {
        return handleRelease(RefCnt.release(refCnt, decrement));
    }

    private boolean handleRelease(boolean result) {
        if (result) {
            deallocate();
        }
        return result;
    }

    /**
     * Called once {@link #refCnt()} is equals 0.
     */
    protected abstract void deallocate();
}