#1225 - ENH: Extend L2 server cache (near caching) for clearing "near caches"

src/main/java/io/ebeaninternal/server/cache/RemoteCacheEvent.java

@@ -0,0 +1,93 @@
+package io.ebeaninternal.server.cache;
+
+import io.ebeaninternal.server.cluster.BinaryMessage;
+import io.ebeaninternal.server.cluster.BinaryMessageList;
+
+import java.io.DataInput;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Cache events broadcast across the cluster.
+ */
+public class RemoteCacheEvent {
+
+  private boolean clearAll;
+
+  private List<String> clearCaches;
+
+  /**
+   * Clear all the caches.
+   */
+  public RemoteCacheEvent(boolean clearAll) {
+    this.clearAll = clearAll;
+    this.clearCaches = null;
+  }
+
+  /**
+   * Clear caches for the given bean type.
+   */
+  public RemoteCacheEvent(Class<?> beanType) {
+    this.clearAll = false;
+    this.clearCaches = new ArrayList<>(1);
+    this.clearCaches.add(beanType.getName());
+  }
+
+  /**
+   * Create with the read options.
+   */
+  public RemoteCacheEvent(boolean clearAll, List<String> beanTypes) {
+    this.clearAll = clearAll;
+    this.clearCaches = beanTypes;
+  }
+
+  public boolean isClearAll() {
+    return clearAll;
+  }
+
+  public List<String> getClearCaches() {
+    return clearCaches;
+  }
+
+  public String toString() {
+    return "clearAll:" + clearAll + " caches:" + clearCaches;
+  }
+
+  public static RemoteCacheEvent readBinaryMessage(DataInput dataInput) throws IOException {
+
+    boolean clearAll = dataInput.readBoolean();
+    int size = dataInput.readInt();
+
+    List<String> clearCache = null;
+    if (size > 0) {
+      clearCache = new ArrayList<>(size);
+      for (int i = 0; i < size; i++) {
+        clearCache.add(dataInput.readUTF());
+      }
+    }
+
+    return new RemoteCacheEvent(clearAll, clearCache);
+  }
+
+  public void writeBinaryMessage(BinaryMessageList msgList) throws IOException {
+
+    int bufferSize = (clearCaches == null) ? 0 : clearCaches.size() * 30;
+
+    BinaryMessage msg = new BinaryMessage(bufferSize + 10);
+    DataOutputStream os = msg.getOs();
+    os.writeInt(BinaryMessage.TYPE_CACHE);
+    os.writeBoolean(clearAll);
+    if (clearCaches == null) {
+      os.writeInt(0);
+    } else {
+      os.writeInt(clearCaches.size());
+      for (String cacheName : clearCaches) {
+        os.writeUTF(cacheName);
+      }
+    }
+    msgList.add(msg);
+
+  }
+}