/usr/share/cruisecontrol-bin-2.6.1/projects/qpid-trunk/cpp/src/qpid/sys/StateMonitor.h

00001 #ifndef QPID_SYS_STATEMONITOR_H
00002 #define QPID_SYS_STATEMONITOR_H
00003 
00004 /*
00005  *
00006  * Licensed to the Apache Software Foundation (ASF) under one
00007  * or more contributor license agreements.  See the NOTICE file
00008  * distributed with this work for additional information
00009  * regarding copyright ownership.  The ASF licenses this file
00010  * to you under the Apache License, Version 2.0 (the
00011  * "License"); you may not use this file except in compliance
00012  * with the License.  You may obtain a copy of the License at
00013  * 
00014  *   http://www.apache.org/licenses/LICENSE-2.0
00015  * 
00016  * Unless required by applicable law or agreed to in writing,
00017  * software distributed under the License is distributed on an
00018  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
00019  * KIND, either express or implied.  See the License for the
00020  * specific language governing permissions and limitations
00021  * under the License.
00022  *
00023  */
00024 #include "qpid/sys/Waitable.h"
00025 
00026 #include <bitset>
00027 
00028 namespace qpid {
00029 namespace sys {
00030 
00037 template <class Enum, size_t MaxEnum>
00038 class StateMonitor : public Waitable
00039 {
00040   public:
00041     struct Set : public std::bitset<MaxEnum + 1> {
00042         Set() {}
00043         Set(Enum s) { set(s); }
00044         Set(Enum s, Enum t) { set(s).set(t); }
00045         Set(Enum s, Enum t, Enum u) { set(s).set(t).set(u); }
00046         Set(Enum s, Enum t, Enum u, Enum v) { set(s).set(t).set(u).set(v); }
00047     };
00048 
00049 
00050     StateMonitor(Enum initial) { state=initial; }
00051 
00053     void set(Enum s) { state=s; notifyAll(); }
00055     StateMonitor& operator=(Enum s) { set(s); return *this; }
00056 
00058     Enum get() const { return state; }
00060     operator Enum() const { return state; }
00061 
00063     void waitFor(Enum s) { ScopedWait(*this); while (s != state) wait(); }
00065     void waitFor(Set s) { ScopedWait(*this); while (!s.test(state)) wait(); }
00067     void waitNot(Enum s) { ScopedWait(*this); while (s == state) wait(); }
00069     void waitNot(Set s) { ScopedWait(*this); while (s.test(state)) wait(); }
00070     
00071   private:
00072     Enum state;
00073 };
00074 
00075 }}
00076 
00077 
00078 #endif  

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