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/*-
* ========================LICENSE_START=================================
* ONAP : ccsdk oran
* ======================================================================
* Copyright (C) 2019-2020 Nordix Foundation. All rights reserved.
* ======================================================================
* 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.
* ========================LICENSE_END===================================
*/
package org.onap.ccsdk.oran.a1policymanagementservice.repository;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.lang.invoke.MethodHandles;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Vector;
import org.jetbrains.annotations.Nullable;
import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ApplicationConfig;
import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.EntityNotFoundException;
import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.FileSystemUtils;
@Configuration
public class PolicyTypes {
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private Map<String, PolicyType> types = new HashMap<>();
private final ApplicationConfig appConfig;
private static Gson gson = new GsonBuilder().create();
public PolicyTypes(@Autowired ApplicationConfig appConfig) {
this.appConfig = appConfig;
restoreFromDatabase();
}
public synchronized PolicyType getType(String name) throws EntityNotFoundException {
PolicyType t = types.get(name);
if (t == null) {
throw new EntityNotFoundException("Could not find type: " + name);
}
return t;
}
public synchronized PolicyType get(String name) {
return types.get(name);
}
public synchronized void put(PolicyType type) {
types.put(type.getId(), type);
store(type);
}
public synchronized boolean contains(String policyType) {
return types.containsKey(policyType);
}
public synchronized Collection<PolicyType> getAll() {
return new Vector<>(types.values());
}
/**
* Filter out types matching criterias
*
* @param types the types to select from
* @param typeName select types with given type name
* @param compatibleWithVersion select types that are compatible with given
* version string (major.minor.patch).
* Matching types will be sorted in ascending
* order.
* @return the types that matches given criterias
* @throws ServiceException if there are errors in the given input
*/
public static Collection<PolicyType> filterTypes(Collection<PolicyType> types, @Nullable String typeName,
@Nullable String compatibleWithVersion) throws ServiceException {
if (typeName != null) {
types = filterTypeName(types, typeName);
}
if (compatibleWithVersion != null) {
types = filterCompatibleWithVersion(types, compatibleWithVersion);
}
return types;
}
public synchronized int size() {
return types.size();
}
public synchronized void clear() {
this.types.clear();
try {
FileSystemUtils.deleteRecursively(getDatabasePath());
} catch (IOException | ServiceException e) {
logger.warn("Could not delete policy type database : {}", e.getMessage());
}
}
public void store(PolicyType type) {
try {
Files.createDirectories(getDatabasePath());
try (PrintStream out = new PrintStream(new FileOutputStream(getFile(type)))) {
out.print(gson.toJson(type));
}
} catch (ServiceException e) {
logger.debug("Could not store policy type: {} {}", type.getId(), e.getMessage());
} catch (IOException e) {
logger.warn("Could not store policy type: {} {}", type.getId(), e.getMessage());
}
}
private File getFile(PolicyType type) throws ServiceException {
return Path.of(getDatabaseDirectory(), type.getId() + ".json").toFile();
}
void restoreFromDatabase() {
try {
Files.createDirectories(getDatabasePath());
for (File file : getDatabasePath().toFile().listFiles()) {
String json = Files.readString(file.toPath());
PolicyType type = gson.fromJson(json, PolicyType.class);
this.types.put(type.getId(), type);
}
logger.debug("Restored type database,no of types: {}", this.types.size());
} catch (ServiceException e) {
logger.debug("Could not restore policy type database : {}", e.getMessage());
} catch (Exception e) {
logger.warn("Could not restore policy type database : {}", e.getMessage());
}
}
private String getDatabaseDirectory() throws ServiceException {
if (appConfig.getVardataDirectory() == null) {
throw new ServiceException("No policy type storage provided");
}
return appConfig.getVardataDirectory() + "/database/policyTypes";
}
private Path getDatabasePath() throws ServiceException {
return Path.of(getDatabaseDirectory());
}
private static Collection<PolicyType> filterTypeName(Collection<PolicyType> types, String typeName) {
Collection<PolicyType> result = new ArrayList<>();
for (PolicyType type : types) {
PolicyType.TypeId nameVersion = type.getTypeId();
if (nameVersion.getName().equals(typeName)) {
result.add(type);
}
}
return result;
}
private static Collection<PolicyType> filterCompatibleWithVersion(Collection<PolicyType> types, String versionStr)
throws ServiceException {
List<PolicyType> result = new ArrayList<>();
PolicyType.Version requestedVersion = PolicyType.Version.ofString(versionStr);
for (PolicyType type : types) {
if (type.getVersion().isCompatibleWith(requestedVersion)) {
result.add(type);
}
}
result.sort((left, right) -> left.getVersion().compareTo(right.getVersion()));
return result;
}
}
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