01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing,
13: * software distributed under the License is distributed on an
14: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15: * KIND, either express or implied. See the License for the
16: * specific language governing permissions and limitations
17: * under the License.
18: */
19: package org.apache.openjpa.lib.util;
20:
21: import java.util.Map;
22:
23: /**
24: * A {@link Map} type that maintains a maximum size, automatically
25: * removing entries when the maximum is exceeded.
26: *
27: * @author Abe White
28: */
29: public interface SizedMap extends Map {
30:
31: /**
32: * The maximum number of entries, or Integer.MAX_VALUE for no limit.
33: */
34: public int getMaxSize();
35:
36: /**
37: * The maximum number of entries, or Integer.MAX_VALUE for no limit.
38: */
39: public void setMaxSize(int max);
40:
41: /**
42: * Whether the map is full.
43: */
44: public boolean isFull();
45:
46: /**
47: * Overridable callback for when an overflow entry is automatically removed.
48: */
49: public void overflowRemoved(Object key, Object value);
50: }
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