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#ifndef QPID_SYS_STATEMONITOR_H
#define QPID_SYS_STATEMONITOR_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.
*
*/
#include "qpid/sys/Waitable.h"
#include <bitset>
namespace qpid {
namespace sys {
/**
* A monitor with an enum state value.
*
*@param Enum: enum type to use for states.
*@param EnumMax: Highest enum value.
*/
template <class Enum, size_t MaxEnum>
class StateMonitor : public Waitable
{
public:
struct Set : public std::bitset<MaxEnum + 1> {
Set() {}
Set(Enum s) { set(s); }
Set(Enum s, Enum t) { std::bitset<MaxEnum + 1>::set(s).set(t); }
Set(Enum s, Enum t, Enum u) { std::bitset<MaxEnum + 1>::set(s).set(t).set(u); }
Set(Enum s, Enum t, Enum u, Enum v) { std::bitset<MaxEnum + 1>::set(s).set(t).set(u).set(v); }
};
StateMonitor(Enum initial) { state=initial; }
/** @pre Caller holds a ScopedLock. */
void set(Enum s) { state=s; notifyAll(); }
/** @pre Caller holds a ScopedLock. */
StateMonitor& operator=(Enum s) { set(s); return *this; }
/** @pre Caller holds a ScopedLock. */
Enum get() const { return state; }
/** @pre Caller holds a ScopedLock. */
operator Enum() const { return state; }
/** @pre Caller holds a ScopedLock */
void waitFor(Enum s) { ScopedWait w(*this); while (s != state) wait(); }
/** @pre Caller holds a ScopedLock */
void waitFor(Set s) { ScopedWait w(*this); while (!s.test(state)) wait(); }
/** @pre Caller holds a ScopedLock */
void waitNot(Enum s) { ScopedWait w(*this); while (s == state) wait(); }
/** @pre Caller holds a ScopedLock */
void waitNot(Set s) { ScopedWait w(*this); while (s.test(state)) wait(); }
private:
Enum state;
};
}}
#endif /*!QPID_SYS_STATEMONITOR_H*/
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