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TatuJLund
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Jun 4, 2024
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30 changes: 0 additions & 30 deletions
30
vaadincreate-ui/src/main/java/org/vaadin/tatu/vaadincreate/crud/LockedBooks.java
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68 changes: 0 additions & 68 deletions
68
vaadincreate-ui/src/main/java/org/vaadin/tatu/vaadincreate/crud/LockedBooksImpl.java
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43 changes: 43 additions & 0 deletions
43
vaadincreate-ui/src/main/java/org/vaadin/tatu/vaadincreate/locking/LockedObjects.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| package org.vaadin.tatu.vaadincreate.locking; | ||
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| import java.io.Serializable; | ||
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| import org.vaadin.tatu.vaadincreate.backend.data.User; | ||
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| @SuppressWarnings("serial") | ||
| public interface LockedObjects { | ||
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| public User isLocked(Class<?> type, Integer id); | ||
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| public void lock(Class<?> type, Integer id, User user); | ||
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| public void unlock(Class<?> type, Integer id); | ||
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| public static LockedObjects get() { | ||
| return LockedObjectsImpl.getInstance(); | ||
| } | ||
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| public static class LockingEvent implements Serializable { | ||
| private Integer id; | ||
| private User user; | ||
| private Class<?> type; | ||
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| public LockingEvent(Class<?> type, Integer id, User user) { | ||
| this.id = id; | ||
| this.type = type; | ||
| this.user = user; | ||
| } | ||
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| public User getUser() { | ||
| return user; | ||
| } | ||
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| public Integer getId() { | ||
| return id; | ||
| } | ||
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| public Class<?> getType() { | ||
| return type; | ||
| } | ||
| } | ||
| } |
91 changes: 91 additions & 0 deletions
91
vaadincreate-ui/src/main/java/org/vaadin/tatu/vaadincreate/locking/LockedObjectsImpl.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package org.vaadin.tatu.vaadincreate.locking; | ||
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| import java.io.Serializable; | ||
| import java.util.Optional; | ||
| import java.util.WeakHashMap; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
| import org.vaadin.tatu.vaadincreate.backend.data.User; | ||
| import org.vaadin.tatu.vaadincreate.eventbus.EventBus; | ||
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| @SuppressWarnings("serial") | ||
| public class LockedObjectsImpl implements LockedObjects { | ||
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| private static LockedObjectsImpl INSTANCE; | ||
| private EventBus eventBus = EventBus.get(); | ||
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| private final WeakHashMap<LockedObject, Object> lockedObjects = new WeakHashMap<>(); | ||
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| public synchronized static LockedObjects getInstance() { | ||
| if (INSTANCE == null) { | ||
| INSTANCE = new LockedObjectsImpl(); | ||
| } | ||
| return INSTANCE; | ||
| } | ||
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| private LockedObjectsImpl() { | ||
| } | ||
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| @Override | ||
| public User isLocked(Class<?> type, Integer id) { | ||
| synchronized (lockedObjects) { | ||
| var match = findObject(type, id); | ||
| if (match.isPresent()) { | ||
| return match.get().user; | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
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| @Override | ||
| public void lock(Class<?> type, Integer id, User user) { | ||
| if (id != null && id < 0) { | ||
| throw new IllegalArgumentException( | ||
| "Id can't be null and must be positive"); | ||
| } | ||
| synchronized (lockedObjects) { | ||
| var match = findObject(type, id); | ||
| if (match.isPresent()) { | ||
| throw new IllegalStateException( | ||
| "Can't locked book already locked: " + id); | ||
| } | ||
| lockedObjects.put(new LockedObject(type, id, user), null); | ||
| eventBus.post(new LockingEvent(type, id, user)); | ||
| logger.debug("Locked book {}", id); | ||
| } | ||
| } | ||
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| @Override | ||
| public void unlock(Class<?> type, Integer id) { | ||
| synchronized (lockedObjects) { | ||
| var match = findObject(type, id); | ||
| if (match.isPresent()) { | ||
| var object = match.get(); | ||
| lockedObjects.remove(object); | ||
| eventBus.post(new LockingEvent(type, id, object.user)); | ||
| } | ||
| logger.debug("Unlocked book {}", id); | ||
| } | ||
| } | ||
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| private Optional<LockedObject> findObject(Class<?> type, Integer id) { | ||
| return lockedObjects.keySet().stream() | ||
| .filter(obj -> obj.type.equals(type) && obj.id.equals(id)) | ||
| .findFirst(); | ||
| } | ||
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| static class LockedObject implements Serializable { | ||
| Integer id; | ||
| Class<?> type; | ||
| User user; | ||
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| LockedObject(Class<?> type, Integer id, User user) { | ||
| this.type = type; | ||
| this.id = id; | ||
| this.user = user; | ||
| } | ||
| } | ||
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| private Logger logger = LoggerFactory.getLogger(this.getClass()); | ||
| } |
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