public void addRuntime(SingleStreamRuntime singleStreamRuntime) {
        overallProcessingMode = ProcessingMode.findUpdatedProcessingMode(overallProcessingMode,
                singleStreamRuntime.getProcessingMode());
        singleStreamRuntimeList.add(singleStreamRuntime);
    }
StreamRuntime implementation to represent Join streams.
modules/siddhi-core/src/main/java/io/siddhi/core/query/input/stream/join/JoinStreamRuntime.java