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/*******************************************************************************
* ============LICENSE_START=======================================================
* org.onap.dmaap
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. 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=========================================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*
*******************************************************************************/
package org.onap.dmaap.dmf.mr.service.impl;
import com.att.nsa.configs.ConfigDb;
import com.att.nsa.configs.ConfigDbException;
import com.att.nsa.configs.ConfigPath;
import org.onap.dmaap.dmf.mr.transaction.DMaaPTransactionFactory;
import org.onap.dmaap.dmf.mr.transaction.DMaaPTransactionObj;
import org.onap.dmaap.dmf.mr.transaction.DMaaPTransactionObjDB;
import org.onap.dmaap.dmf.mr.transaction.TransactionObj;
import java.util.Set;
import java.util.TreeSet;
/**
* Persistent storage for Transaction objects built over an abstract config db.
*
* @author anowarul.islam
*
* @param <K>
*/
public class BaseTransactionDbImpl<K extends DMaaPTransactionObj> implements DMaaPTransactionObjDB<K> {
private final ConfigDb fDb;
private final ConfigPath fBasePath;
private final DMaaPTransactionFactory<K> fKeyFactory;
private static final String kStdRootPath = "/transaction";
private ConfigPath makePath(String transactionId) {
return fBasePath.getChild(transactionId);
}
/**
* Construct an Transaction db over the given config db at the standard
* location
*
* @param db
* @param keyFactory
* @throws ConfigDbException
*/
public BaseTransactionDbImpl(ConfigDb db, DMaaPTransactionFactory<K> keyFactory) throws ConfigDbException {
this(db, kStdRootPath, keyFactory);
}
/**
* Construct an Transaction db over the given config db using the given root
* location
*
* @param db
* @param rootPath
* @param keyFactory
* @throws ConfigDbException
*/
public BaseTransactionDbImpl(ConfigDb db, String rootPath, DMaaPTransactionFactory<K> keyFactory)
throws ConfigDbException {
fDb = db;
fBasePath = db.parse(rootPath);
fKeyFactory = keyFactory;
if (!db.exists(fBasePath)) {
db.store(fBasePath, "");
}
}
/**
* Create a new Transaction Obj. If one exists,
*
* @param id
* @return the new Transaction record
* @throws ConfigDbException
*/
public synchronized K createTransactionObj(String id) throws KeyExistsException, ConfigDbException {
final ConfigPath path = makePath(id);
if (fDb.exists(path)) {
throw new KeyExistsException(id);
}
// make one, store it, return it
final K newKey = fKeyFactory.makeNewTransactionId(id);
fDb.store(path, newKey.serialize());
return newKey;
}
/**
* Save an Transaction record. This must be used after changing auxiliary
* data on the record. Note that the transaction object must exist (via
* createTransactionObj).
*
* @param transaction
* object
* @throws ConfigDbException
*/
@Override
public synchronized void saveTransactionObj(K trnObj) throws ConfigDbException {
final ConfigPath path = makePath(trnObj.getId());
if (!fDb.exists(path) || !(trnObj instanceof TransactionObj)) {
throw new IllegalStateException(trnObj.getId() + " is not known to this database");
}
fDb.store(path, ((TransactionObj) trnObj).serialize());
}
/**
* Load an Transaction record based on the Transaction Id value
*
* @param transactionId
* @return an Transaction Object record or null
* @throws ConfigDbException
*/
@Override
public synchronized K loadTransactionObj(String transactionId) throws ConfigDbException {
final String data = fDb.load(makePath(transactionId));
if (data != null) {
return fKeyFactory.makeNewTransactionObj(data);
}
return null;
}
/**
* Load all transactions known to this database. (This could be expensive.)
*
* @return a set of all Transaction objects
* @throws ConfigDbException
*/
public synchronized Set<String> loadAllTransactionObjs() throws ConfigDbException {
final TreeSet<String> result = new TreeSet<>();
for (ConfigPath cp : fDb.loadChildrenNames(fBasePath)) {
result.add(cp.getName());
}
return result;
}
}
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