01: // Copyright 2006 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // Unless required by applicable law or agreed to in writing, software
10: // distributed under the License is distributed on an "AS IS" BASIS,
11: // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12: // See the License for the specific language governing permissions and
13: // limitations under the License.
14:
15: package org.apache.tapestry;
16:
17: import java.io.Serializable;
18:
19: /**
20: * An action that is associated with a component. This is used in several areas of Tapestry and is
21: * primarily an attempt to externalize state for a component so that it can be recorded outside the
22: * object.
23: * <p>
24: * ComponentActions should be immutable. They are often created during one request and associated
25: * with a particular component instance. They are then used in a later request (with an equivalent
26: * component instance).
27: * <p>
28: * ComponentActions are serializable (they are often serialized into Base64 strings for storage on
29: * the client).
30: */
31: public interface ComponentAction<T> extends Serializable {
32: /** Passed a component instance, the action should operate upon the instance. */
33: void execute(T component);
34: }
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