This [sample factory](https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PrintEvents.java) creates a unique ID for each call and uses that ID to differentiate calls in log messages.

```java
class PrintingEventListener extends EventListener {
  public static final Factory FACTORY = new Factory() {

        return ls;
    }

    // ===================================================================================
    //                                                                         Unique Info
    //                                                                         ===========
    @Override
    public boolean hasPrimaryKey() {
        return false;
    }

    @Override

        return ls;
    }

    // ===================================================================================
    //                                                                         Unique Info
    //                                                                         ===========
    @Override
    public boolean hasPrimaryKey() {
        return false;
    }

    @Override

        return ls;
    }

    // ===================================================================================
    //                                                                         Unique Info
    //                                                                         ===========
    @Override
    public boolean hasPrimaryKey() {
        return false;
    }

    @Override

        return ls;
    }

    // ===================================================================================
    //                                                                         Unique Info
    //                                                                         ===========
    @Override
    public boolean hasPrimaryKey() {
        return false;
    }

    @Override

	globalLocalDrivesMu.RUnlock()

	quorum := (len(localDrives) / 2)

	buckets = make([]BucketInfo, 0, 32)
	healBuckets := xsync.NewMapOf[string, VolInfo]()

	// lists all unique buckets across drives.
	if err := listAllBuckets(ctx, localDrives, healBuckets, quorum); err != nil {
		return nil, err
	}

	// include deleted buckets in listBuckets output

     * validates the image format, applies scaling and cropping transformations,
     * and writes the resulting thumbnail to the output file.</p>
     *
     * @param thumbnailId the unique identifier for the thumbnail
     * @param outputFile the file where the generated thumbnail will be saved
     * @return true if the thumbnail was successfully generated, false otherwise
     */
    @Override

        return ls;
    }

    // ===================================================================================
    //                                                                         Unique Info
    //                                                                         ===========
    @Override
    public boolean hasPrimaryKey() {
        return false;
    }

    @Override

        return ls;
    }

    // ===================================================================================
    //                                                                         Unique Info
    //                                                                         ===========
    @Override
    public boolean hasPrimaryKey() {
        return false;
    }

    @Override

   * many individual lookups. Note that {@link LoadingCache#getAll} will defer to individual calls
   * to {@link LoadingCache#get} if this method is not overridden.
   *
   * @param keys the unique, non-null keys whose values should be loaded
   * @return a map from each key in {@code keys} to the value associated with that key; <b>may not
   *     contain null values</b>
   * @throws Exception if unable to load the result