Source Code Cross Referenced for DoubleCheckedLockingCheck.java in  » Code-Analyzer » checkstyle » com » puppycrawl » tools » checkstyle » checks » coding » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Code Analyzer » checkstyle » com.puppycrawl.tools.checkstyle.checks.coding 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        ////////////////////////////////////////////////////////////////////////////////
02:        // checkstyle: Checks Java source code for adherence to a set of rules.
03:        // Copyright (C) 2001-2007  Oliver Burn
04:        //
05:        // This library is free software; you can redistribute it and/or
06:        // modify it under the terms of the GNU Lesser General Public
07:        // License as published by the Free Software Foundation; either
08:        // version 2.1 of the License, or (at your option) any later version.
09:        //
10:        // This library is distributed in the hope that it will be useful,
11:        // but WITHOUT ANY WARRANTY; without even the implied warranty of
12:        // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13:        // Lesser General Public License for more details.
14:        //
15:        // You should have received a copy of the GNU Lesser General Public
16:        // License along with this library; if not, write to the Free Software
17:        // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18:        ////////////////////////////////////////////////////////////////////////////////
19:        package com.puppycrawl.tools.checkstyle.checks.coding;
20:
21:        import antlr.collections.AST;
22:        import com.puppycrawl.tools.checkstyle.api.Check;
23:        import com.puppycrawl.tools.checkstyle.api.DetailAST;
24:        import com.puppycrawl.tools.checkstyle.api.TokenTypes;
25:
26:        /**
27:         * Detect the double-checked locking idiom, a technique that tries to avoid
28:         * synchronization overhead but is incorrect because of subtle artifacts of
29:         * the java memory model.
30:         *
31:         * See <a href=
32:         * "http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html"
33:         * >The &quot;Double-Checked Locking is Broken&quot; Declaration</a> for a
34:         * more in depth explanation.
35:         *
36:         * @author Lars K&uuml;hne
37:         */
38:        public class DoubleCheckedLockingCheck extends Check {
39:            /** {@inheritDoc} */
40:            public int[] getDefaultTokens() {
41:                return new int[] { TokenTypes.LITERAL_IF };
42:            }
43:
44:            /** {@inheritDoc} */
45:            public void visitToken(DetailAST aAST) {
46:                final DetailAST synchronizedAST = getLowestParent(aAST,
47:                        TokenTypes.LITERAL_SYNCHRONIZED);
48:                if (synchronizedAST == null) {
49:                    return;
50:                }
51:
52:                final DetailAST ifAST = getLowestParent(synchronizedAST,
53:                        TokenTypes.LITERAL_IF);
54:                if (ifAST == null) {
55:                    return;
56:                }
57:
58:                if (getIfCondition(aAST).equalsTree(getIfCondition(ifAST))) {
59:                    log(aAST.getLineNo(), aAST.getColumnNo(),
60:                            "doublechecked.locking.avoid");
61:                }
62:            }
63:
64:            /**
65:             * returns the condition of an if statement.
66:             * @param aIfAST the LITERAL_IF AST
67:             * @return the AST that represents the condition of the if statement
68:             */
69:            private AST getIfCondition(DetailAST aIfAST) {
70:                return aIfAST.getFirstChild().getNextSibling();
71:            }
72:
73:            /**
74:             * searches towards the root of the AST for a specific AST type.
75:             * @param aAST the starting node for searching (inclusive)
76:             * @param aTokenType the token type to search for
77:             * @return the first token of type aTokenTye or null if no such token exists
78:             */
79:            private DetailAST getLowestParent(DetailAST aAST, int aTokenType) {
80:                DetailAST synchronizedParent = aAST;
81:                while ((synchronizedParent != null)
82:                        && (synchronizedParent.getType() != aTokenType)) {
83:                    synchronizedParent = synchronizedParent.getParent();
84:                }
85:                return synchronizedParent;
86:            }
87:        }
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