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.ioc.internal.util;
16:
17: /**
18: * Similiar to {@link Runnable} execpt that it returns a value. Used by {@link ConcurrentBarrier} to
19: * identify the block of code to execute with read/write lock protection.
20: *
21: * @param <T>
22: * the return value type
23: */
24: public interface Invokable<T> {
25: /** Called to produce a value. */
26: T invoke();
27: }
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