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rocksdb/thrift/lib/cpp/test/loadgen/TerminalMonitor.h

85 lines
2.7 KiB

/*
* 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.
*/
#ifndef THRIFT_TEST_LOADGEN_TERMINALMONITOR_H_
#define THRIFT_TEST_LOADGEN_TERMINALMONITOR_H_ 1
#include "thrift/lib/cpp/test/loadgen/Monitor.h"
namespace apache { namespace thrift { namespace loadgen {
/**
* A Monitor object that prints statistics to a terminal.
*
* It handles printing header lines, and re-printing the header whenever it
* scrolls off of the screen.
*/
class TerminalMonitor : public Monitor {
public:
TerminalMonitor();
virtual void redisplay(uint64_t intervalUsec);
/**
* Initialize monitoring information.
*
* This method is called immediately after all of the Workers have started,
* just before the initial monitoring interval. It can be used to get
* initial counter values from all of the Workers, so that statistics
* reported in the first call to printInfo() are accurate.
*
* If subclasses override initializeInfo(), they should make sure to call
* TerminalMonitor::initializeInfo() in their method.
*/
virtual void initializeInfo();
/**
* Print header lines.
*
* This is called when monitoring first starts. If the screen height can
* be determined, this is also called every time the previous header scrolls
* off the screen.
*
* @return Returns the number of lines printed.
*/
virtual uint32_t printHeader() = 0;
/**
* Print monitoring information.
*
* This is called once every specified interval.
*
* @param intervalUsec The number of microseconds since the previous call to
* printInfo(). The first time printInfo() is called,
* this is the number of microseconds since
* initializeInfo() was called.
*
* @return Returns the number of lines printed.
*/
virtual uint32_t printInfo(uint64_t intervalUsec) = 0;
protected:
int32_t getScreenHeight();
int32_t screenHeight_;
uint32_t linesPrinted_;
};
}}} // apache::thrift::loadgen
#endif // THRIFT_TEST_LOADGEN_TERMINALMONITOR_H_