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/*******************************************************************************
* ============LICENSE_START====================================================
* * org.onap.aai
* * ===========================================================================
* * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* * Copyright © 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.
* * ============LICENSE_END====================================================
* *
* * ECOMP is a trademark and service mark of AT&T Intellectual Property.
* *
******************************************************************************/
package com.att.dao;
import java.util.ArrayList;
import java.util.List;
import com.att.authz.layer.Result;
import com.att.dao.aaf.cass.Status;
import com.att.inno.env.Trans;
/**
* CachedDAO
*
* Cache the response of "get" of any DAO.
*
* For simplicity's sake, at this time, we only do this for single Object keys
*
*
* @param <DATA>
*/
public class CachedDAO<TRANS extends Trans,D extends DAO<TRANS,DATA>,DATA extends Cacheable>
extends Cached<TRANS,DATA> implements DAO_RO<TRANS,DATA>{
// private final String dirty_str;
private final D dao;
public CachedDAO(D dao, CIDAO<TRANS> info, int segsize) {
super(info, dao.table(), segsize);
// Instantiate a new Cache per DAO name (so separate instances use the same cache)
this.dao = dao;
//read_str = "Cached READ for " + dao.table();
// dirty_str = "Cache DIRTY on " + dao.table();
if(dao instanceof CassDAOImpl) {
((CassDAOImpl<?,?>)dao).cache = this;
}
}
public static<T extends Trans, DA extends DAO<T,DT>, DT extends Cacheable>
CachedDAO<T,DA,DT> create(DA dao, CIDAO<T> info, int segsize) {
return new CachedDAO<T,DA,DT>(dao,info, segsize);
}
public void add(DATA data) {
String key = keyFromObjs(dao.keyFrom(data));
List<DATA> list = new ArrayList<DATA>();
list.add(data);
super.add(key,list);
}
// public void invalidate(TRANS trans, Object ... objs) {
// TimeTaken tt = trans.start(dirty_str, Env.SUB);
// try {
// super.invalidate(keyFromObjs(objs));
// } finally {
// tt.done();
// }
// }
public static String keyFromObjs(Object ... objs) {
String key;
if(objs.length==1 && objs[0] instanceof String) {
key = (String)objs[0];
} else {
StringBuilder sb = new StringBuilder();
boolean first = true;
for(Object o : objs) {
if(o!=null) {
if(first) {
first =false;
} else {
sb.append('|');
}
sb.append(o.toString());
}
}
key = sb.toString();
}
return key;
}
public Result<DATA> create(TRANS trans, DATA data) {
Result<DATA> d = dao.create(trans,data);
if(d.status==Status.OK) {
add(d.value);
} else {
trans.error().log(d.errorString());
}
invalidate(trans,data);
return d;
}
protected class DAOGetter implements Getter<DATA> {
protected TRANS trans;
protected Object objs[];
protected D dao;
public Result<List<DATA>> result;
public DAOGetter(TRANS trans, D dao, Object ... objs) {
this.trans = trans;
this.dao = dao;
this.objs = objs;
}
/**
* Separated into single call for easy overloading
* @return
*/
public Result<List<DATA>> call() {
return dao.read(trans, objs);
}
@Override
public final Result<List<DATA>> get() {
return call();
// if(result.isOKhasData()) { // Note, given above logic, could exist, but stale
// return result.value;
// } else {
// return null;
// }
}
}
@Override
public Result<List<DATA>> read(final TRANS trans, final Object ... objs) {
DAOGetter getter = new DAOGetter(trans,dao,objs);
return get(trans, keyFromObjs(objs),getter);
// if(ld!=null) {
// return Result.ok(ld);//.emptyList(ld.isEmpty());
// }
// // Result Result if exists
// if(getter.result==null) {
// return Result.err(Status.ERR_NotFound, "No Cache or Lookup found on [%s]",dao.table());
// }
// return getter.result;
}
// Slight Improved performance available when String and Obj versions are known.
public Result<List<DATA>> read(final String key, final TRANS trans, final Object ... objs) {
DAOGetter getter = new DAOGetter(trans,dao,objs);
return get(trans, key, getter);
// if(ld!=null) {
// return Result.ok(ld);//.emptyList(ld.isEmpty());
// }
// // Result Result if exists
// if(getter.result==null) {
// return Result.err(Status.ERR_NotFound, "No Cache or Lookup found on [%s]",dao.table());
// }
// return getter.result;
}
@Override
public Result<List<DATA>> read(TRANS trans, DATA data) {
return read(trans,dao.keyFrom(data));
}
public Result<Void> update(TRANS trans, DATA data) {
Result<Void> d = dao.update(trans, data);
if(d.status==Status.OK) {
add(data);
} else {
trans.error().log(d.errorString());
}
return d;
}
public Result<Void> delete(TRANS trans, DATA data, boolean reread) {
if(reread) { // If reread, get from Cache, if possible, not DB exclusively
Result<List<DATA>> rd = read(trans,data);
if(rd.notOK()) {
return Result.err(rd);
} else {
trans.error().log(rd.errorString());
}
if(rd.isEmpty()) {
data.invalidate(this);
return Result.err(Status.ERR_NotFound,"Not Found");
}
data = rd.value.get(0);
}
Result<Void> rv=dao.delete(trans, data, false);
data.invalidate(this);
return rv;
}
@Override
public void close(TRANS trans) {
if(dao!=null) {
dao.close(trans);
}
}
@Override
public String table() {
return dao.table();
}
public D dao() {
return dao;
}
public void invalidate(TRANS trans, DATA data) {
if(info.touch(trans, dao.table(),data.invalidate(this)).notOK()) {
trans.error().log("Cannot touch CacheInfo for Role");
}
}
}
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