zdm/envoy
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Persisting cache in PersistentLocalDb

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This commit is contained in:
Kai S. K. Engelbart
2020-02-06 21:42:17 +01:00
parent 4afe073e79
commit 74715bbf82
4 changed files with 23 additions and 11 deletions
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4
src/main/java/envoy/client/data/Cache.java
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@@ -1,5 +1,6 @@
package envoy.client.data; package envoy.client.data;
import java.io.Serializable;
import java.util.LinkedList; import java.util.LinkedList;
import java.util.Queue; import java.util.Queue;
import java.util.function.Consumer; import java.util.function.Consumer;
@@ -18,12 +19,13 @@ import envoy.client.util.EnvoyLog;
* @author Kai S. K. Engelbart * @author Kai S. K. Engelbart
* @since Envoy v0.3-alpha * @since Envoy v0.3-alpha
*/ */
public class Cache<T> implements Consumer<T> { public class Cache<T> implements Consumer<T>, Serializable {
private final Queue<T> elements = new LinkedList<>(); private final Queue<T> elements = new LinkedList<>();
private transient Consumer<T> processor; private transient Consumer<T> processor;
private static final Logger logger = EnvoyLog.getLogger(Cache.class.getSimpleName()); private static final Logger logger = EnvoyLog.getLogger(Cache.class.getSimpleName());
private static final long serialVersionUID = 7343544675545545076L;
/** /**
* Adds an element to the cache. * Adds an element to the cache.

8
src/main/java/envoy/client/data/LocalDb.java
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@@ -24,8 +24,8 @@ public abstract class LocalDb {
protected Map<String, User> users = new HashMap<>(); protected Map<String, User> users = new HashMap<>();
protected List<Chat> chats = new ArrayList<>(); protected List<Chat> chats = new ArrayList<>();
protected IdGenerator idGenerator; protected IdGenerator idGenerator;
protected Cache<Message> messageCache; protected Cache<Message> messageCache = new Cache<>();
protected Cache<MessageStatusChangeEvent> statusCache; protected Cache<MessageStatusChangeEvent> statusCache = new Cache<>();
/** /**
* Initializes a storage space for a user-specific list of chats. * Initializes a storage space for a user-specific list of chats.
@@ -52,12 +52,12 @@ public abstract class LocalDb {
public void loadUsers() throws Exception {} public void loadUsers() throws Exception {}
/** /**
* Loads all chat data of the client user. * Loads all data of the client user.
* *
* @throws Exception if the loading process failed * @throws Exception if the loading process failed
* @since Envoy v0.3-alpha * @since Envoy v0.3-alpha
*/ */
public void loadChats() throws Exception {} public void loadUserData() throws Exception {}
/** /**
* Loads the ID generator. Any exception thrown during this process is ignored. * Loads the ID generator. Any exception thrown during this process is ignored.

20
src/main/java/envoy/client/data/PersistentLocalDb.java
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@@ -23,7 +23,7 @@ import envoy.util.SerializationUtils;
*/ */
public class PersistentLocalDb extends LocalDb { public class PersistentLocalDb extends LocalDb {
private File localDBDir, localDBFile, usersFile, idGeneratorFile; private File localDBDir, localDBFile, usersFile, idGeneratorFile, messageCacheFile, statusCacheFile;
/** /**
* Initializes an empty local database without a directory. All changes made to * Initializes an empty local database without a directory. All changes made to
@@ -63,7 +63,9 @@ public class PersistentLocalDb extends LocalDb {
@Override @Override
public void initializeUserStorage() { public void initializeUserStorage() {
if (user == null) throw new NullPointerException("Client user is null"); if (user == null) throw new NullPointerException("Client user is null");
localDBFile = new File(localDBDir, user.getId() + ".db"); localDBFile = new File(localDBDir, user.getId() + ".db");
messageCacheFile = new File(localDBDir, user.getId() + "_message_cache.db");
statusCacheFile = new File(localDBDir, user.getId() + "_status_cache.db");
} }
@Override @Override
@@ -71,8 +73,12 @@ public class PersistentLocalDb extends LocalDb {
// Save users // Save users
SerializationUtils.write(usersFile, users); SerializationUtils.write(usersFile, users);
// Save chats // Save user data
if (user != null) SerializationUtils.write(localDBFile, chats); if (user != null) {
SerializationUtils.write(localDBFile, chats);
SerializationUtils.write(messageCacheFile, messageCache);
SerializationUtils.write(statusCacheFile, statusCache);
}
// Save id generator // Save id generator
if (hasIdGenerator()) SerializationUtils.write(idGeneratorFile, idGenerator); if (hasIdGenerator()) SerializationUtils.write(idGeneratorFile, idGenerator);
@@ -82,7 +88,11 @@ public class PersistentLocalDb extends LocalDb {
public void loadUsers() throws ClassNotFoundException, IOException { users = SerializationUtils.read(usersFile, HashMap.class); } public void loadUsers() throws ClassNotFoundException, IOException { users = SerializationUtils.read(usersFile, HashMap.class); }
@Override @Override
public void loadChats() throws ClassNotFoundException, IOException { chats = SerializationUtils.read(localDBFile, ArrayList.class); } public void loadUserData() throws ClassNotFoundException, IOException {
chats = SerializationUtils.read(localDBFile, ArrayList.class);
messageCache = SerializationUtils.read(messageCacheFile, Cache.class);
statusCache = SerializationUtils.read(statusCacheFile, Cache.class);
}
@Override @Override
public void loadIdGenerator() { public void loadIdGenerator() {

2
src/main/java/envoy/client/ui/Startup.java
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@@ -138,7 +138,7 @@ public class Startup {
// Initialize chats in local database // Initialize chats in local database
try { try {
localDb.initializeUserStorage(); localDb.initializeUserStorage();
localDb.loadChats(); localDb.loadUserData();
} catch (FileNotFoundException e) { } catch (FileNotFoundException e) {
// The local database file has not yet been created, probably first login // The local database file has not yet been created, probably first login
} catch (Exception e) { } catch (Exception e) {