Display pending buckets, push buckets older than 30s

- TimedList tracks when list is populated with first element

anno-gui/src/main/java/org/genesys2/anno/gui/TimedList.java

+/*
+ * Copyright 2019 Global Crop Diversity Trust
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.genesys2.anno.gui;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Date;
+
+/**
+ * The Class TimedList.
+ *
+ * @param <T> the generic type
+ */
+public class TimedList<T> extends ArrayList<T> {
+	private static final long serialVersionUID = 2721716147790325499L;
+	private Date created = null;
+
+	public TimedList() {
+	}
+	
+	@Override
+	public void clear() {
+		created = null;
+		super.clear();
+	}
+
+	@Override
+	public boolean add(T e) {
+		if (created == null) {
+			created = new Date();
+		}
+		return super.add(e);
+	}
+
+	@Override
+	public boolean addAll(Collection<? extends T> c) {
+		if (created == null) {
+			created = new Date();
+		}
+		return super.addAll(c);
+	}
+
+	@Override
+	public void add(int index, T element) {
+		if (created == null) {
+			created = new Date();
+		}
+		super.add(index, element);
+	}
+
+	@Override
+	public boolean addAll(int index, Collection<? extends T> c) {
+		if (created == null) {
+			created = new Date();
+		}
+		return super.addAll(index, c);
+	}
+
+	public Date getCreated() {
+		return created;
+	}
+
+	public boolean isOlderThanSeconds(int seconds) {
+		if (created == null) {
+			return true;
+		}
+		return (new Date().getTime() - created.getTime()) / 1000 > seconds;
+	}
+}