sPFFramework/src/main/java/it/polimi/spf/framework/search/SearchScheduler.java
private void sendSearchSignal(String queryId) {
		log(TAG, "handler is asking for a search signal");
		QueryInfo qd = queries.get(queryId);
		if (qd != null) {
			performer.sendSearchSignal(qd);
		}
	}
private void sendSearchSignal(String queryId) {
		log(TAG, "handler is asking for a search signal");
		QueryInfo qd = queries.get(queryId);
		if (qd != null) {
			performer.sendSearchSignal(qd);
		}
	}
Emits the search signal through the {@link SearchPerformer} object.

@param queryId
the query for which the search signal has to be emitted.