Method getMetrics

bindings/java/JavaWorkload.cpp:446–478

	}

	void getMetrics(jobject workload, const std::string& workloadName, std::vector<FDBPerfMetric>& result) {
		auto clazz = getClass(workloadName.c_str());
		auto perfMetricClass = getClass("Lcom/apple/foundationdb/testing/PerfMetric;");
		auto nameId = getField(perfMetricClass, "name", "Ljava/lang/String;");
		auto valueId = getField(perfMetricClass, "value", "D");
		auto averagedId = getField(perfMetricClass, "averaged", "Z");
		auto formatCodeId = getField(perfMetricClass, "formatCode", "Ljava/lang/String;");
		auto v = env->CallObjectMethod(workload, getMethod(clazz, "getMetrics", "()Ljava/util/List;"));
		checkException();
		auto listClass = getClass("java/util/List");
		auto iter = env->CallObjectMethod(v, getMethod(listClass, "iterator", "()Ljava/util/Iterator;"));
		checkException();
		auto iterClass = getClass("java/util/Iterator");
		auto hasNextM = getMethod(iterClass, "hasNext", "()Z");
		auto nextM = getMethod(iterClass, "next", "()Ljava/lang/Object;");
		jboolean hasNext = env->CallBooleanMethod(iter, hasNextM);
		checkException();
		while (hasNext) {
			auto perfMetric = env->CallObjectMethod(iter, nextM);
			checkException();
			auto name = jtoStr(jstring(env->GetObjectField(perfMetric, nameId)));
			checkException();
			auto value = env->GetDoubleField(perfMetric, valueId);
			checkException();
			auto averaged = env->GetBooleanField(perfMetric, averagedId);
			checkException();
			auto formatCode = jtoStr(jstring(env->GetObjectField(perfMetric, formatCodeId)));
			result.emplace_back(FDBPerfMetric{ name, value, bool(averaged), formatCode });
			hasNext = env->CallBooleanMethod(iter, hasNextM);
			checkException();
		}
		return;
	}

	jobject createDatabase(jobject workload, FDBDatabase* db) {
		auto executor = env->CallObjectMethod(workload,