| #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) { set(s).set(t); } |
| Set(Enum s, Enum t, Enum u) { set(s).set(t).set(u); } |
| Set(Enum s, Enum t, Enum u, Enum v) { 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(*this); while (s != state) wait(); } |
| /** @pre Caller holds a ScopedLock */ |
| void waitFor(Set s) { ScopedWait(*this); while (!s.test(state)) wait(); } |
| /** @pre Caller holds a ScopedLock */ |
| void waitNot(Enum s) { ScopedWait(*this); while (s == state) wait(); } |
| /** @pre Caller holds a ScopedLock */ |
| void waitNot(Set s) { ScopedWait(*this); while (s.test(state)) wait(); } |
| |
| private: |
| Enum state; |
| }; |
| |
| }} |
| |
| |
| #endif /*!QPID_SYS_STATEMONITOR_H*/ |