2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.drools.statemanagement;
23 import java.util.Observer;
25 import org.onap.policy.common.im.StandbyStatusException;
26 import org.onap.policy.common.im.StateManagement;
27 import org.onap.policy.drools.properties.Lockable;
28 import org.onap.policy.drools.utils.OrderedService;
29 import org.onap.policy.drools.utils.OrderedServiceImpl;
32 * This interface provides a way to invoke optional features at various
33 * points in the code. At appropriate points in the
34 * application, the code iterates through this list, invoking these optional
35 * methods. Most of the methods here are notification only -- these tend to
36 * return a 'void' value. In other cases, such as 'activatePolicySession',
39 public interface StateManagementFeatureAPI extends OrderedService, Lockable
42 public static final String LOCKED = StateManagement.LOCKED;
43 public static final String UNLOCKED = StateManagement.UNLOCKED;
44 public static final String ENABLED = StateManagement.ENABLED;
45 public static final String DISABLED = StateManagement.DISABLED;
46 public static final String ENABLE_NOT_FAILED = StateManagement.ENABLE_NOT_FAILED;
47 public static final String DISABLE_FAILED = StateManagement.DISABLE_FAILED;
48 public static final String FAILED = StateManagement.FAILED;
49 public static final String DEPENDENCY = StateManagement.DEPENDENCY;
50 public static final String DEPENDENCY_FAILED = StateManagement.DEPENDENCY_FAILED;
51 public static final String DISABLE_DEPENDENCY = StateManagement.DISABLE_DEPENDENCY;
52 public static final String ENABLE_NO_DEPENDENCY = StateManagement.ENABLE_NO_DEPENDENCY;
53 public static final String NULL_VALUE = StateManagement.NULL_VALUE;
54 public static final String LOCK = StateManagement.LOCK;
55 public static final String UNLOCK = StateManagement.UNLOCK;
56 public static final String PROMOTE = StateManagement.PROMOTE;
57 public static final String DEMOTE = StateManagement.DEMOTE;
58 public static final String HOT_STANDBY = StateManagement.HOT_STANDBY;
59 public static final String COLD_STANDBY = StateManagement.COLD_STANDBY;
60 public static final String PROVIDING_SERVICE = StateManagement.PROVIDING_SERVICE;
62 public static final String ADMIN_STATE = StateManagement.ADMIN_STATE;
63 public static final String OPERATION_STATE = StateManagement.OPERATION_STATE;
64 public static final String AVAILABLE_STATUS= StateManagement.AVAILABLE_STATUS;
65 public static final String STANDBY_STATUS = StateManagement.STANDBY_STATUS;
67 public static final int SEQ_NUM = 0;
69 * 'FeatureAPI.impl.getList()' returns an ordered list of objects
70 * implementing the 'FeatureAPI' interface.
72 public static OrderedServiceImpl<StateManagementFeatureAPI> impl =
73 new OrderedServiceImpl<>(StateManagementFeatureAPI.class);
76 * This method is called to add an Observer to receive notifications of state changes
78 * @param stateChangeObserver
80 public void addObserver(Observer stateChangeObserver);
83 * This method returns the X.731 Administrative State for this resource
85 * @return String (locked, unlocked)
87 public String getAdminState();
90 * This method returns the X.731 Operational State for this resource
92 * @return String (enabled, disabled)
94 public String getOpState();
97 * This method returns the X.731 Availability Status for this resource
99 * @return String (failed; dependency; dependency,failed)
101 public String getAvailStatus();
104 * This method returns the X.731 Standby Status for this resource
106 * @return String (providingservice, hotstandby or coldstandby)
108 public String getStandbyStatus();
111 * This method returns the X.731 Standby Status for the named resource
112 * @param String (resourceName)
113 * @return String (providingservice, hotstandby or coldstandby)
115 public String getStandbyStatus(String resourceName);
118 * This method moves the X.731 Operational State for the named resource
119 * into a value of disabled and the Availability Status to a value of failed.
120 * As a consequence the Standby Status value will take a value of coldstandby.
122 * @param String (resourceName)
125 public void disableFailed(String resourceName) throws Exception;
128 * This method moves the X.731 Operational State for this resource
129 * into a value of disabled and the Availability Status to a value of failed.
130 * As a consequence the Standby Status value will take a value of coldstandby.
132 * @param String (resourceName)
135 public void disableFailed() throws Exception;
138 * This method moves the X.731 Standby Status for this resource from hotstandby
139 * to providingservice. If the current value is coldstandby, no change is made.
140 * If the current value is null, it will move to providingservice assuming the
141 * Operational State is enabled and Administrative State is unlocked.
143 * @throws StandbyStatusException
145 public void promote() throws StandbyStatusException, Exception;
148 * This method moves the X.731 Standby Status for this resource from providingservice
149 * to hotstandby. If the current value is null, it will move to hotstandby assuming the
150 * Operational State is enabled and Administrative State is unlocked. Else, it will move
154 public void demote() throws Exception;
157 * This method returns the resourceName associated with this instance of the StateManagementFeature
158 * @return String (resourceName)
160 public String getResourceName();
163 * This Lockable method will lock the StateManagement object Admin state
164 * @return true if successfull, false otherwise
167 public boolean lock();
170 * This Lockable method will unlock the StateManagement object Admin state
171 * @return true if successfull, false otherwise
174 public boolean unlock();
177 * This Lockable method indicates the Admin state StateManagement object
178 * @return true if locked, false otherwise
181 public boolean isLocked();