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Revision 9629

Added by Jing Tao over 8 years ago

Use a hashmap to replace a sql query to improve performance in the getHeadPID method.

View differences:

src/edu/ucsb/nceas/metacat/IdentifierManager.java
31 31
import java.sql.Timestamp;
32 32
import java.util.ArrayList;
33 33
import java.util.Date;
34
import java.util.HashMap;
34 35
import java.util.Hashtable;
35 36
import java.util.List;
36 37
import java.util.Vector;
......
992 993
            PreparedStatement stmt = null;
993 994
            int endsCount = 0;
994 995
            boolean hasError = false;
996
            HashMap<String, String> obsoletesIdGuidMap = new HashMap<String, String>();//the key is an obsoletes id, the value is an guid
995 997
            try {
996 998
                // Get a database connection from the pool
997 999
                dbConn = DBConnectionPool.getDBConnection("IdentifierManager.getHeadPID");
......
1008 1010
                    while(hasNext) {
1009 1011
                        String guidStr = rs.getString(1);
1010 1012
                        String obsoletedByStr = rs.getString(2);
1011
                        String obsoetesStr = rs.getString(3);
1013
                        String obsoletesStr = rs.getString(3);
1012 1014
                        Identifier guid = new Identifier();
1013 1015
                        guid.setValue(guidStr);
1016
                        if(obsoletesStr != null && !obsoletesStr.trim().equals("")) {
1017
                            if(obsoletesIdGuidMap.containsKey(obsoletesStr) && !guidStr.equals(obsoletesIdGuidMap.get(obsoletesStr))) {
1018
                                logMetacat.error("Both id "+guidStr+" and id "+obsoletesIdGuidMap.get(obsoletesStr)+" obsoletes the id"+obsoletesStr+
1019
                                        ". It is illegal. So the head pid maybe is wrong.");
1020
                                hasError = true;
1021
                            } 
1022
                            obsoletesIdGuidMap.put(obsoletesStr, guidStr);
1023
                        }
1014 1024
                        if(first) {
1015 1025
                            firstOne = guid;
1016 1026
                            first =false;
......
1036 1046
                                    endsCount++;
1037 1047
                                }
1038 1048
                            } else {
1049
                                logMetacat.debug("The object "+obsoletedBy+" which obsoletes "+guidStr+" is missing.");
1039 1050
                                //obsoletedBySysmeta doesn't exist; it means the object is missing
1040 1051
                                //generally, we consider it we generally consider it a type 2 end except:
1041 1052
                                 //there is another object in the chain (has the same series id) that obsoletes the missing object. 
1042
                                String sql2 = "select guid from systemMetadata where  obsoletes = ? and series_id = ?";
1053
                                /*String sql2 = "select guid from systemMetadata where  obsoletes = ? and series_id = ?";
1043 1054
                                PreparedStatement stmt2 = dbConn.prepareStatement(sql2);
1044 1055
                                stmt2.setString(1, obsoletedBy.getValue());
1045 1056
                                stmt2.setString(2, sid.getValue());
......
1062 1073
                                    // something is wrong - there are more than one objects obsolete the missing object!
1063 1074
                                    hasError = true;
1064 1075
                                    break;
1076
                                }*/
1077
                                if(obsoletesIdGuidMap != null && obsoletesIdGuidMap.containsKey(obsoletedByStr)) {
1078
                                   //This is the exception - another object in the chain (has the same series id) that obsoletes the missing object
1079
                                    //The obsoletesIdGuidMap maintains the relationship (with the same  series id)
1080
                                    logMetacat.debug("Though the object "+obsoletedBy+" which obsoletes "+guidStr+" is missing."+
1081
                                            " However, there is another object "+obsoletesIdGuidMap.get(obsoletedByStr)+" in the chain obsoleting it. So it is not an end.");
1082
                                  
1083
                                } else {
1084
                                    //the exception (another object in the chain (has the same series id) that obsoletes the missing object) doesn't exist
1085
                                    // it is a type 2 end
1086
                                    logMetacat.debug(""+guidStr+" is a type 2 end for sid "+sid.getValue());
1087
                                    pid = guid;
1088
                                    endsCount++;
1065 1089
                                }
1066 1090
                            }
1067 1091
                        }

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