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#ifndef QPID_SYS_LATENCYMETRIC_H
#define QPID_SYS_LATENCYMETRIC_H
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#ifdef QPID_LATENCY_METRIC
#include "qpid/sys/IntegerTypes.h"
namespace qpid {
namespace sys {
/** Use this base class to add a timestamp for latency to an object */
struct LatencyMetricTimestamp {
LatencyMetricTimestamp() : latency_metric_timestamp(0) {}
static void initialize(const LatencyMetricTimestamp&);
static void clear(const LatencyMetricTimestamp&);
int64_t latency_metric_timestamp;
};
/**
* Record average latencies, report on destruction.
*
* For debugging only, use via macros below so it can be compiled out
* of production code.
*/
class LatencyMetric {
public:
/** msg should be a string literal. */
LatencyMetric(const char* msg, int64_t skip_=0);
~LatencyMetric();
void record(const LatencyMetricTimestamp& start);
private:
void report();
const char* message;
int64_t count, total, skipped, skip;
};
}} // namespace qpid::sys
#define QPID_LATENCY_INIT(x) ::qpid::sys::LatencyMetricTimestamp::initialize(x)
#define QPID_LATENCY_CLEAR(x) ::qpid::sys::LatencyMetricTimestamp::clear(x)
#define QPID_LATENCY_RECORD(msg, x) do { \
static ::qpid::sys::LatencyMetric metric__(msg); metric__.record(x); \
} while (false)
#define QPID_LATENCY_RECORD_SKIP(msg, x, skip) do { \
static ::qpid::sys::LatencyMetric metric__(msg, skip); metric__.record(x); \
} while (false)
#else /* defined QPID_LATENCY_METRIC */
namespace qpid { namespace sys {
class LatencyMetricTimestamp {};
}}
#define QPID_LATENCY_INIT(x) (void)x
#define QPID_LATENCY_CLEAR(x) (void)x
#define QPID_LATENCY_RECORD(msg, x) (void)x
#define QPID_LATENCY_RECORD_SKIP(msg, x, skip) (void)x
#endif /* defined QPID_LATENCY_METRIC */
#endif /*!QPID_SYS_LATENCYMETRIC_H*/
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