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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.pap.main.rest;
import java.util.ArrayList;
import java.util.List;
import javax.ws.rs.core.Response;
import org.apache.commons.lang3.tuple.Pair;
import org.onap.policy.common.utils.services.Registry;
import org.onap.policy.models.base.PfModelException;
import org.onap.policy.models.pap.concepts.PdpGroupStateChangeResponse;
import org.onap.policy.models.pdp.concepts.Pdp;
import org.onap.policy.models.pdp.concepts.PdpGroup;
import org.onap.policy.models.pdp.concepts.PdpGroupFilter;
import org.onap.policy.models.pdp.concepts.PdpStateChange;
import org.onap.policy.models.pdp.concepts.PdpSubGroup;
import org.onap.policy.models.pdp.concepts.PdpUpdate;
import org.onap.policy.models.pdp.enums.PdpState;
import org.onap.policy.models.provider.PolicyModelsProvider;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyIdentifier;
import org.onap.policy.pap.main.PapConstants;
import org.onap.policy.pap.main.PolicyModelsProviderFactoryWrapper;
import org.onap.policy.pap.main.comm.PdpModifyRequestMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Provider for PAP component to change state of PDP group.
*
* @author Ram Krishna Verma (ram.krishna.verma@est.tech)
*/
public class PdpGroupStateChangeProvider {
private static final Logger LOGGER = LoggerFactory.getLogger(PdpGroupStateChangeProvider.class);
/**
* Lock used when updating PDPs.
*/
private final Object updateLock;
/**
* Used to send UPDATE and STATE-CHANGE requests to the PDPs.
*/
private final PdpModifyRequestMap requestMap;
/**
* Factory for PAP DAO.
*/
PolicyModelsProviderFactoryWrapper modelProviderWrapper;
/**
* Constructs the object.
*/
public PdpGroupStateChangeProvider() {
modelProviderWrapper = Registry.get(PapConstants.REG_PAP_DAO_FACTORY, PolicyModelsProviderFactoryWrapper.class);
updateLock = Registry.get(PapConstants.REG_PDP_MODIFY_LOCK, Object.class);
requestMap = Registry.get(PapConstants.REG_PDP_MODIFY_MAP, PdpModifyRequestMap.class);
}
/**
* Changes state of a PDP group.
*
* @param groupName name of the PDP group
* @param pdpGroupState state of the PDP group
* @return a pair containing the status and the response
* @throws PfModelException in case of errors
*/
public Pair<Response.Status, PdpGroupStateChangeResponse> changeGroupState(final String groupName,
final PdpState pdpGroupState) throws PfModelException {
synchronized (updateLock) {
switch (pdpGroupState) {
case ACTIVE:
handleActiveState(groupName);
break;
case PASSIVE:
handlePassiveState(groupName);
break;
default:
throw new PfModelException(Response.Status.BAD_REQUEST,
"Only ACTIVE or PASSIVE state changes are allowed");
}
return Pair.of(Response.Status.OK, new PdpGroupStateChangeResponse());
}
}
private void handleActiveState(final String groupName) throws PfModelException {
try (PolicyModelsProvider databaseProvider = modelProviderWrapper.create()) {
final PdpGroupFilter filter = PdpGroupFilter.builder().name(groupName).groupState(PdpState.ACTIVE).build();
final List<PdpGroup> activePdpGroups = databaseProvider.getFilteredPdpGroups(filter);
final List<PdpGroup> pdpGroups = databaseProvider.getPdpGroups(groupName);
if (activePdpGroups.isEmpty() && !pdpGroups.isEmpty()) {
updatePdpGroupAndPdp(databaseProvider, pdpGroups, PdpState.ACTIVE);
sendPdpMessage(pdpGroups.get(0), PdpState.ACTIVE, databaseProvider);
} else if (!pdpGroups.isEmpty() && !activePdpGroups.isEmpty()) {
updatePdpGroupAndPdp(databaseProvider, pdpGroups, PdpState.ACTIVE);
updatePdpGroup(databaseProvider, activePdpGroups, PdpState.PASSIVE);
sendPdpMessage(pdpGroups.get(0), PdpState.ACTIVE, databaseProvider);
}
}
}
private void handlePassiveState(final String groupName) throws PfModelException {
try (PolicyModelsProvider databaseProvider = modelProviderWrapper.create()) {
final List<PdpGroup> pdpGroups = databaseProvider.getPdpGroups(groupName);
if (!pdpGroups.isEmpty() && !PdpState.PASSIVE.equals(pdpGroups.get(0).getPdpGroupState())) {
updatePdpGroupAndPdp(databaseProvider, pdpGroups, PdpState.PASSIVE);
sendPdpMessage(pdpGroups.get(0), PdpState.PASSIVE, databaseProvider);
}
}
}
private void updatePdpGroup(final PolicyModelsProvider databaseProvider, final List<PdpGroup> pdpGroups,
final PdpState pdpState) throws PfModelException {
pdpGroups.get(0).setPdpGroupState(pdpState);
databaseProvider.updatePdpGroups(pdpGroups);
LOGGER.debug("Updated PdpGroup in DB - {} ", pdpGroups);
}
private void updatePdpGroupAndPdp(final PolicyModelsProvider databaseProvider, final List<PdpGroup> pdpGroups,
final PdpState pdpState) throws PfModelException {
pdpGroups.get(0).setPdpGroupState(pdpState);
for (final PdpSubGroup subGroup : pdpGroups.get(0).getPdpSubgroups()) {
for (final Pdp pdp : subGroup.getPdpInstances()) {
pdp.setPdpState(pdpState);
}
}
databaseProvider.updatePdpGroups(pdpGroups);
LOGGER.debug("Updated PdpGroup and Pdp in DB - {} ", pdpGroups);
}
private void sendPdpMessage(final PdpGroup pdpGroup, final PdpState pdpState,
final PolicyModelsProvider databaseProvider) throws PfModelException {
for (final PdpSubGroup subGroup : pdpGroup.getPdpSubgroups()) {
for (final Pdp pdp : subGroup.getPdpInstances()) {
final PdpUpdate pdpUpdatemessage =
createPdpUpdateMessage(pdpGroup.getName(), subGroup, pdp.getInstanceId(), databaseProvider);
final PdpStateChange pdpStateChangeMessage =
createPdpStateChangeMessage(pdpGroup.getName(), subGroup, pdp.getInstanceId(), pdpState);
requestMap.addRequest(pdpUpdatemessage, pdpStateChangeMessage);
LOGGER.debug("Sent PdpUpdate message - {}", pdpUpdatemessage);
LOGGER.debug("Sent PdpStateChange message - {}", pdpStateChangeMessage);
}
}
}
private PdpUpdate createPdpUpdateMessage(final String pdpGroupName, final PdpSubGroup subGroup,
final String pdpInstanceId, final PolicyModelsProvider databaseProvider) throws PfModelException {
final PdpUpdate update = new PdpUpdate();
update.setName(pdpInstanceId);
update.setPdpGroup(pdpGroupName);
update.setPdpSubgroup(subGroup.getPdpType());
update.setPolicies(getToscaPolicies(subGroup, databaseProvider));
LOGGER.debug("Created PdpUpdate message - {}", update);
return update;
}
private List<ToscaPolicy> getToscaPolicies(final PdpSubGroup subGroup, final PolicyModelsProvider databaseProvider)
throws PfModelException {
final List<ToscaPolicy> policies = new ArrayList<>();
for (final ToscaPolicyIdentifier policyIdentifier : subGroup.getPolicies()) {
policies.addAll(databaseProvider.getPolicyList(policyIdentifier.getName(), policyIdentifier.getVersion()));
}
LOGGER.debug("Created ToscaPolicy list - {}", policies);
return policies;
}
private PdpStateChange createPdpStateChangeMessage(final String pdpGroupName, final PdpSubGroup subGroup,
final String pdpInstanceId, final PdpState pdpState) {
final PdpStateChange stateChange = new PdpStateChange();
stateChange.setName(pdpInstanceId);
stateChange.setPdpGroup(pdpGroupName);
stateChange.setPdpSubgroup(subGroup.getPdpType());
stateChange.setState(pdpState);
LOGGER.debug("Created PdpStateChange message - {}", stateChange);
return stateChange;
}
}
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