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/*
* 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.
*/
/**
* \file DataOpState.cpp
*/
#include "DataOpState.h"
#include "JournalError.h"
#include <sstream> // std::ostringstream
namespace qpid {
namespace asyncStore {
namespace jrnl2 {
DataOpState::DataOpState() :
State<opState_t>()
{}
DataOpState::DataOpState(const opState_t s) :
State<opState_t>(s)
{}
DataOpState::DataOpState(const DataOpState& s) :
State<opState_t>(s)
{}
DataOpState::~DataOpState() {}
void
DataOpState::enqueue() {
set(OP_ENQUEUE);
}
void
DataOpState::dequeue() {
set(OP_DEQUEUE);
}
const char*
DataOpState::getAsStr() const {
return s_toStr(m_state);
}
// static
const char*
DataOpState::s_toStr(const opState_t s) {
switch (s) {
case OP_NONE:
return "OP_NONE";
case OP_ENQUEUE:
return "OP_ENQUEUE";
case OP_DEQUEUE:
return "OP_DEQUEUE";
default:
std::ostringstream oss;
oss << "<unknown state (" << "s" << ")>";
return oss.str().c_str();
}
}
// private
void
DataOpState::set(const opState_t s) {
// State transition logic: set stateError to true if an invalid transition is attempted
bool stateTransitionError = false;
switch(m_state) {
case OP_NONE:
if (s != OP_ENQUEUE) stateTransitionError = true;
break;
case OP_ENQUEUE:
if (s != OP_DEQUEUE) stateTransitionError = true;
break;
case OP_DEQUEUE: // Cannot move out of this state except with reset()
stateTransitionError = true;
break;
}
if (stateTransitionError) {
THROW_STATE_EXCEPTION(JournalError::JERR_MSGOPSTATE, s_toStr(s), s_toStr(m_state), "DataOpState", "set");
}
m_state = s;
}
}}} // namespace qpid::asyncStore::jrnl2
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