01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * Resin Open Source is free software; you can redistribute it and/or modify
10: * it under the terms of the GNU General Public License as published by
11: * the Free Software Foundation; either version 2 of the License, or
12: * (at your option) any later version.
13: *
14: * Resin Open Source is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17: * of NON-INFRINGEMENT. See the GNU General Public License for more
18: * details.
19: *
20: * You should have received a copy of the GNU General Public License
21: * along with Resin Open Source; if not, write to the
22: *
23: * Free Software Foundation, Inc.
24: * 59 Temple Place, Suite 330
25: * Boston, MA 02111-1307 USA
26: *
27: * @author Emil Ong
28: */
29:
30: package com.caucho.vfs;
31:
32: public interface LockableStream {
33: /**
34: * Lock the shared advisory lock. This method will
35: * create a shared "read" lock when the shared
36: * argument is true and an exclusive "write" lock
37: * when the shared argument is false. If the block
38: * argument is false then this call will not block
39: * if the lock can't be obtained.
40: */
41: public boolean lock(boolean shared, boolean block);
42:
43: /**
44: * Unlock the advisory lock. Return true if a
45: * lock was held, false otherwise.
46: */
47: public boolean unlock();
48:
49: }
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