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TatuJLund
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May 26, 2024
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30 changes: 30 additions & 0 deletions
30
vaadincreate-ui/src/main/java/org/vaadin/tatu/vaadincreate/crud/LockedBooks.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| package org.vaadin.tatu.vaadincreate.crud; | ||
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| import java.io.Serializable; | ||
| import java.util.Collection; | ||
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| @SuppressWarnings("serial") | ||
| public interface LockedBooks { | ||
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| public Collection<Integer> lockedBooks(); | ||
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| public void lock(Integer id); | ||
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| public void unlock(Integer id); | ||
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| public static LockedBooks get() { | ||
| return LockedBooksImpl.getInstance(); | ||
| } | ||
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| public static class BookEvent implements Serializable { | ||
| private Integer id; | ||
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| public BookEvent(Integer id) { | ||
| this.id = id; | ||
| } | ||
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| public Integer getId() { | ||
| return id; | ||
| } | ||
| } | ||
| } |
64 changes: 64 additions & 0 deletions
64
vaadincreate-ui/src/main/java/org/vaadin/tatu/vaadincreate/crud/LockedBooksImpl.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| package org.vaadin.tatu.vaadincreate.crud; | ||
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| import java.util.Collection; | ||
| import java.util.WeakHashMap; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
| import org.vaadin.tatu.vaadincreate.eventbus.EventBus; | ||
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| @SuppressWarnings("serial") | ||
| public class LockedBooksImpl implements LockedBooks { | ||
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| private static LockedBooksImpl INSTANCE; | ||
| private EventBus eventBus = EventBus.get(); | ||
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| private final WeakHashMap<Integer, Object> books = new WeakHashMap<>(); | ||
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| public synchronized static LockedBooks getInstance() { | ||
| if (INSTANCE == null) { | ||
| INSTANCE = new LockedBooksImpl(); | ||
| } | ||
| return INSTANCE; | ||
| } | ||
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| private LockedBooksImpl() { | ||
| } | ||
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| @Override | ||
| public Collection<Integer> lockedBooks() { | ||
| synchronized (books) { | ||
| return books.keySet(); | ||
| } | ||
| } | ||
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| @Override | ||
| public void lock(Integer id) { | ||
| synchronized (books) { | ||
| var match = books.keySet().stream().filter(i -> i.equals(id)) | ||
| .findFirst(); | ||
| if (match.isPresent()) { | ||
| throw new IllegalStateException( | ||
| "Can't open book already opened: " + id); | ||
| } | ||
| books.put(id, null); | ||
| eventBus.post(new BookEvent(id)); | ||
| logger.info("Locked book {}", id); | ||
| } | ||
| } | ||
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| @Override | ||
| public void unlock(Integer id) { | ||
| synchronized (books) { | ||
| var match = books.keySet().stream().filter(i -> i.equals(id)) | ||
| .findFirst(); | ||
| if (match.isPresent()) { | ||
| books.remove(match.get()); | ||
| } | ||
| eventBus.post(new BookEvent(id)); | ||
| logger.info("Unlocked book {}", id); | ||
| } | ||
| } | ||
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| private Logger logger = LoggerFactory.getLogger(this.getClass()); | ||
| } |
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