blob: 9fc1233cd36688cbeaecbda76c350c6d8d23fb8c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*-
* ============LICENSE_START=======================================================
* ONAP : APPC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Copyright (C) 2017 Amdocs
* =============================================================================
* Licensed 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.
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
* ============LICENSE_END=========================================================
*/
package org.openecomp.appc.statemachine.impl;
import java.util.HashSet;
import java.util.Set;
import org.openecomp.appc.exceptions.InvalidInputException;
import org.openecomp.appc.statemachine.StateMachine;
import org.openecomp.appc.statemachine.objects.Event;
import org.openecomp.appc.statemachine.objects.Response;
import org.openecomp.appc.statemachine.objects.State;
import org.openecomp.appc.statemachine.objects.StateMachineMetadata;
import org.openecomp.appc.statemachine.objects.StateMachineResponse;
import org.openecomp.appc.statemachine.objects.Transition;
public class StateMachineImpl implements StateMachine {
private final Set<State> states;
private final Set<Event> events;
StateMachineImpl(StateMachineMetadata metadata){
this.states = new HashSet<>();
this.states.addAll(metadata.getStates());
this.events = new HashSet<>();
this.events.addAll(metadata.getEvents());
}
public StateMachineResponse handleEvent(State inputState, Event event) throws InvalidInputException{
if(!validateInputs(inputState,event)){
throw new InvalidInputException("VNF State or incoming event is invalid. State = " +inputState + " event = " + event );
}
StateMachineResponse response = new StateMachineResponse();
State currentState = null,nextState = null;
for(State stateInSet:states){
if(stateInSet.equals(inputState)){
currentState = stateInSet;
break;
}
}
if (currentState != null) {
for (Transition transition : currentState.getTransitions()) {
if (event.equals(transition.getEvent())) {
nextState = transition.getNextState();
}
}
}
if(nextState == null){
response.setResponse(Response.NO_TRANSITION_DEFINED);
}
else if(inputState.equals(nextState)){
response.setResponse(Response.NO_STATE_CHANGE);
}
else{
response.setResponse(Response.VALID_TRANSITION);
}
response.setNextState(nextState);
return response;
}
private boolean validateInputs(State state,Event event) {
return state != null && event != null && this.states.contains(state) && this.events.contains(event);
}
@Override
public String toString() {
return "StateMachineImpl{" +
"states=" + states +
", events=" + events +
'}';
}
}
|
