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Decentralized Instant Messaging (Java SDK)
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/* license: https://mit-license.org
*
* DIMP : Decentralized Instant Messaging Protocol
*
* Written in 2022 by Moky
*
* ==============================================================================
* The MIT License (MIT)
*
* Copyright (c) 2022 Albert Moky
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
* ==============================================================================
*/
package chat.dim.database;
import java.util.ArrayList;
import java.util.List;
import chat.dim.dbi.GroupDBI;
import chat.dim.mem.CacheHolder;
import chat.dim.mem.CacheManager;
import chat.dim.mem.CachePair;
import chat.dim.mem.CachePool;
import chat.dim.protocol.ID;
import chat.dim.sqlite.DatabaseConnector;
import chat.dim.sqlite.account.GroupTable;
public class GroupDatabase implements GroupDBI {
private final GroupTable groupTable;
private final CachePool founderCache;
private final CachePool ownerCache;
private final CachePool> membersCache;
private final CachePool> assistantsCache;
public GroupDatabase(DatabaseConnector sqliteConnector) {
super();
groupTable = new GroupTable(sqliteConnector);
CacheManager man = CacheManager.getInstance();
founderCache = man.getPool("founder");
ownerCache = man.getPool("owner");
membersCache = man.getPool("members");
assistantsCache = man.getPool("assistants");
}
//
// Group DBI
//
@Override
public ID getFounder(ID group) {
long now = System.currentTimeMillis();
ID value = null;
CacheHolder holder = null;
// 1. check memory cache
CachePair pair = founderCache.fetch(group, now);
if (pair != null) {
value = pair.value;
holder = pair.holder;
}
if (value == null) {
// cache empty
if (holder == null) {
// cache not load yet, wait to load
founderCache.update(group, null, 128 * 1000, now);
} else {
if (holder.isAlive(now)) {
// cache not exists
return null;
}
// cache expired, wait to load
holder.renewal(128 * 1000, now);
}
// 2. check sqlite
value = groupTable.getFounder(group);
if (value == null) {
// placeholder
value = ID.FOUNDER;
}
// update memory cache
founderCache.update(group, value, 36000 * 1000, now);
} else if (value.isBroadcast()) {
// placeholder
value = null;
}
// OK, return cached value
return value;
}
@Override
public ID getOwner(ID group) {
long now = System.currentTimeMillis();
ID value = null;
CacheHolder holder = null;
// 1. check memory cache
CachePair pair = ownerCache.fetch(group, now);
if (pair != null) {
value = pair.value;
holder = pair.holder;
}
if (value == null) {
// cache empty
if (holder == null) {
// cache not load yet, wait to load
ownerCache.update(group, null, 128 * 1000, now);
} else {
if (holder.isAlive(now)) {
// cache not exists
return null;
}
// cache expired, wait to load
holder.renewal(128 * 1000, now);
}
// 2. check sqlite
value = groupTable.getOwner(group);
if (value == null) {
// placeholder
value = ID.ANYONE;
}
// update memory cache
ownerCache.update(group, value, 3600 * 1000, now);
} else if (value.isBroadcast()) {
// placeholder
value = null;
}
// OK, return cached value
return value;
}
@Override
public List getMembers(ID group) {
long now = System.currentTimeMillis();
List value = null;
CacheHolder> holder = null;
// 1. check memory cache
CachePair> pair = membersCache.fetch(group, now);
if (pair != null) {
value = pair.value;
holder = pair.holder;
}
if (value == null) {
// cache empty
if (holder == null) {
// cache not load yet, wait to load
membersCache.update(group, null, 128 * 1000, now);
} else {
if (holder.isAlive(now)) {
// cache not exists
return new ArrayList<>();
}
// cache expired, wait to load
holder.renewal(128 * 1000, now);
}
// 2. check sqlite
value = groupTable.getMembers(group);
if (value == null) {
// placeholder
value = new ArrayList<>();
}
// update memory cache
membersCache.update(group, value, 3600 * 1000, now);
}
// OK, return cached value
return value;
}
@Override
public boolean saveMembers(List members, ID group) {
long now = System.currentTimeMillis();
// 1. update memory cache
membersCache.update(group, members, 3600 * 1000, now);
// 2. update sqlite
return groupTable.saveMembers(members, group);
}
@Override
public List getAssistants(ID group) {
long now = System.currentTimeMillis();
List value = null;
CacheHolder> holder = null;
// 1. check memory cache
CachePair> pair = assistantsCache.fetch(group, now);
if (pair != null) {
value = pair.value;
holder = pair.holder;
}
if (value == null) {
// cache empty
if (holder == null) {
// cache not load yet, wait to load
assistantsCache.update(group, null, 128 * 1000, now);
} else {
if (holder.isAlive(now)) {
// cache not exists
return new ArrayList<>();
}
// cache expired, wait to load
holder.renewal(128 * 1000, now);
}
// 2. check sqlite
value = groupTable.getAssistants(group);
if (value == null) {
// placeholder
value = new ArrayList<>();
}
// update memory cache
assistantsCache.update(group, value, 3600 * 1000, now);
}
// OK, return cached value
return value;
}
@Override
public boolean saveAssistants(List bots, ID group) {
long now = System.currentTimeMillis();
// 1. update memory cache
assistantsCache.update(group, bots, 3600 * 1000, now);
// 2. update sqlite
return groupTable.saveAssistants(bots, group);
}
@Override
public List getAdministrators(ID group) {
// TODO: load admins
return null;
}
@Override
public boolean saveAdministrators(List members, ID group) {
// TODO: save admins
return false;
}
}