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src/main/java/thaumicenergistics/common/grid/EssentiaWatcher.java

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+package thaumicenergistics.common.grid;
+
+import net.minecraft.resources.ResourceLocation;
+import thaumicenergistics.api.grid.IEssentiaWatcher;
+import thaumicenergistics.api.grid.IEssentiaWatcherHost;
+import java.util.*;
+
+/**
+ * 监听源质网格的变化并通知 host。
+ */
+public class EssentiaWatcher implements IEssentiaWatcher {
+    private final IEssentiaWatcherHost host;
+    private final Set<ResourceLocation> watchedAspects = new HashSet<>();
+    private final Map<ResourceLocation, Long> lastAmounts = new HashMap<>();
+    private final EssentiaMonitor monitor;
+
+    public EssentiaWatcher(IEssentiaWatcherHost host, EssentiaMonitor monitor) {
+        this.host = host;
+        this.monitor = monitor;
+    }
+
+    @Override public IEssentiaWatcherHost getHost() { return host; }
+    @Override public int size() { return watchedAspects.size(); }
+    @Override public boolean isEmpty() { return watchedAspects.isEmpty(); }
+    @Override public boolean contains(Object o) { return watchedAspects.contains(o); }
+    @Override public Iterator<ResourceLocation> iterator() { return watchedAspects.iterator(); }
+    @Override public Object[] toArray() { return watchedAspects.toArray(); }
+    @Override public <T> T[] toArray(T[] a) { return watchedAspects.toArray(a); }
+    @Override public boolean add(ResourceLocation id) { return watchedAspects.add(id); }
+    @Override public boolean remove(Object o) { lastAmounts.remove(o); return watchedAspects.remove(o); }
+    @Override public boolean containsAll(Collection<?> c) { return watchedAspects.containsAll(c); }
+    @Override public boolean addAll(Collection<? extends ResourceLocation> c) { return watchedAspects.addAll(c); }
+    @Override public boolean removeAll(Collection<?> c) { lastAmounts.keySet().removeAll(c); return watchedAspects.removeAll(c); }
+    @Override public boolean retainAll(Collection<?> c) { lastAmounts.keySet().retainAll(c); return watchedAspects.retainAll(c); }
+    @Override public void clear() { lastAmounts.clear(); watchedAspects.clear(); }
+
+    /** 检查所有被监听的源质，并在变化时通知 host。 */
+    public void tick() {
+        for (ResourceLocation id : watchedAspects) {
+            long current = monitor.get(id);
+            Long last = lastAmounts.get(id);
+            if (last == null || last != current) {
+                lastAmounts.put(id, current);
+                host.onEssentiaChange(id, current, 0);
+            }
+        }
+    }
+}