trunk/tools/ClusterConnection.java

package tools;
import java.sql.*;
import java.util.ArrayList;
import java.util.HashMap;

/**
 * ClusterConnection class to wrap the master/node mysql servers so that is transparent to other programs
 * @author Jose Duarte
 */

public class ClusterConnection {

        private String MASTERDB=DataDistribution.KEYMASTERDB; 
        private final String MASTERHOST=DataDistribution.MASTER;
        private MySQLConnection nCon;
        private MySQLConnection mCon;
        public String keyTable;
        public String key;
        public String host;
        public String db;
        private String user;
        private String password;

        /**
         * Create a ClusterConnection passing a key. 
         * @param db the database name
         * @param key the key name: e.g. asu_id
         * @param user the user name for connection to both master and nodes
         * @param password the password for connection to both master and nodes
         * @throws SQLException 
         */
        public ClusterConnection (String db,String key, String user,String password) throws SQLException {
                setDb(db);
                setUser(user);
                setPassword(password);
                // For nCon we create a connection to the master too. 
                // This is just a place holder because the actual node connection is not created until we create the statement
                // If we don't do this then when closing the two connections an exception might occurr because we try to close a non existing object
                this.nCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB); 
                this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
                this.key=key; //can't use the setKey method here before we've got the db field initialized
                setKeyTable(db);
        }

        /**
         * Create a ClusterConnection without passing a key. The key will be set later when we call createStatement(key,idx) 
         * @param db the database name
         * @param user the user name for connection to both master and nodes
         * @param password the password for connection to both master and nodes
         * @throws SQLException 
         */ 
        public ClusterConnection (String db, String user,String password) throws SQLException { 
                setDb(db);
                setUser(user);
                setPassword(password);          
                // For nCon we create a connection to the master too. 
                // This is just a place holder because the actual node connection is not created until we create the statement
                // If we don't do this then when closing the two connections an exception might occurr because we try to close a non existing object
                this.nCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB); 
                this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
        }
        
        public void close() {
                this.nCon.close();
                this.mCon.close();
        }
        
        public <T> String getHost4Idx (T idx) {
                String host="";
                String query = "SELECT client_name FROM "+keyTable+" AS m INNER JOIN clients_names AS c "+
                                           "ON (m.client_id=c.client_id) WHERE "+key+"='"+idx+"';";
                host=this.mCon.getStringFromDb(query);
                return host;
        }
        
        public <T> void setHostFromIdx(T idx) throws SQLException{
                setHost(getHost4Idx(idx));
        }
        
        public void setHost(String host) throws SQLException {
                this.host=host;
                //Closing previous connection is essential
                //If we don't close it a lot of connections stay open after using a ClusterConnection object for a while
                this.nCon.close(); 
                this.nCon = new MySQLConnection(host,user,password,db);
        }
        
        /**
         * This method is strictly private. We shouldn't call this from another class as a key might not be set when we call it
         * and thus we can't get the client_id from the master key table. Only to be called from createStatement(key,idx)
         * @param idx the value of the id for a certain key already set
         * @return a Stament object with a connection to the node that contains idx for key
         * @throws SQLException 
         */
        private <T> Statement createStatement(T idx) throws SQLException { // to use when the field "key" is already set
                setKeyTable();
                Statement S=null;
                this.setHostFromIdx(idx);
                try {
                        S=this.nCon.createStatement();
                }
                catch (SQLException e){
                        System.err.println("SQLException: " + e.getMessage());
                        System.err.println("SQLState:     " + e.getSQLState());
                        System.err.println("Couldn't create statement for the node connection, idx= "+idx+", exiting.");
                        System.exit(2);                                                                 
                }
                return S;
        }
        
        /**
         * This method is used to create a statement passing the key and idx. It will create a connection the the right node 
         * and return a Statement for that connection
         * @param idx the key name
         * @param idx the id value for that key
         * @return a Statement object with a connection to the node that contains idx for key
         * @throws SQLException 
         */
        public <T> Statement createStatement(String key,T idx) throws SQLException {
                setKey(key);
                return createStatement(idx);
        }
        
        /**
         * To execute a sql update/insert query in the right node given a query, key and idx. Just a shortcut not to have to do the create statement and execute
         * @param query the SQL query
         * @param key the name of the key
         * @param idx the id value for that key
         */
        public <T> void executeSql(String query,String key, T idx) throws SQLException {
                Statement stmt;
                stmt = this.createStatement(key,idx);   
                stmt.execute(query);
                stmt.close();               
        }
        
        /**
         * To change the MASTERDB String, i.e. the name of the key master database. To be used in testing.
         * @param db the name of the key master db we want to use instead of the default defined in the MASTERDB field
         * @throws SQLException 
         */
        public void setKeyDb(String db) throws SQLException { 
                this.MASTERDB=db;
                //Closing previous connection is essential
                this.mCon.close(); 
                this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
        }
        
        /**
         * To set keyTable field in constructor (i.e. first time). Only to be used in constructor.
         * @param db the database name
         */
        public void setKeyTable(String db) { 
                String query="SELECT key_master_table FROM dbs_keys WHERE db=\'"+db+"\' AND key_name=\'"+this.key+"\';";
                this.keyTable=this.mCon.getStringFromDb(query);
        }
        
        /**
         * To set the keyTable field when db is already set
         * The value of keyTable is taken from the dbs_keys table in the database given the db and key.
         */
        public void setKeyTable() {  
                String query="SELECT key_master_table FROM dbs_keys WHERE db=\'"+this.db+"\' AND key_name=\'"+this.key+"\';";
                this.keyTable=this.mCon.getStringFromDb(query);
        }
        
        public String getKeyTable() {
                return this.keyTable;
        }
        
        /**
         * To get the name of the target table where splitted data is stored in nodes, e.g. for keyTable pdbgraph__asu_list, we get asu_list
         * @return
         */
        public String getTableOnNode(){
                String table="";
                if (this.keyTable.contains("__")) {
                        String[] tokens=this.keyTable.split("__");
                        table=tokens[1];
                }
                else {
                        System.err.println("Error! The keyTable field is not set in this ClusterConnection object.");
                }
                return table;
        }
        
        public void setUser(String user) {
                this.user=user;
        }

        public void setPassword(String password) {
                this.password=password;
        }
        
        public void setDb(String db){
                this.db=db;
        }
        
        public void setKey(String key){
                this.key=key;
                setKeyTable();
        }

        public Statement createMasterStatement() { 
                Statement S=null;
                try {
                        S=this.mCon.createStatement();
                }
                catch (SQLException e){
                        System.err.println("SQLException: " + e.getMessage());
                        System.err.println("SQLState:     " + e.getSQLState());
                        System.err.println("Couldn't create statement for the master connection, exiting.");
                        System.exit(2);                                                                 
                }
                return S;
        }
        
        public Object[] getAllIdxFromMaster(String key) { 
                this.setKey(key);
                Object[] ids=null;
                ArrayList<Object> idsAL=new ArrayList<Object>();
                try {                   
                        String query="SELECT "+key+" FROM "+keyTable+";";
                        Statement S=this.mCon.createStatement();
                        ResultSet R=S.executeQuery(query);
                        while (R.next()){
                                idsAL.add(R.getInt(1));
                        }
                        R.close();
                        S.close();
                }
                catch (SQLException e){
                        System.err.println("SQLException: " + e.getMessage());
                        System.err.println("SQLState:     " + e.getSQLState());
                        System.err.println("Couldn't get all indices from columnn "+key+" in table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
                        System.exit(2);                                                                 
                }
                ids=new Object[idsAL.size()];
                for (int i=0;i<idsAL.size();i++){
                        ids[i]=idsAL.get(i);
                }
                return ids;
        }
        
        /**
         * To get all ids and clients_names pairs for a certain key. Useful when need to submit to all hosts using qsub -q
         * @param key the name of the key
         * @return HashMap with keys = indices, and values = node names where the corresponding index is stored
         */
        public HashMap<Object,String> getAllIdxAndClients (String key){
                this.setKey(key);
                HashMap<Object,String> idsAndClients=new HashMap<Object,String>();
                try {
                        String query="SELECT a."+key+",c.client_name FROM "+keyTable+" AS a INNER JOIN clients_names AS c ON (a.client_id=c.client_id);";
                        Statement S=this.mCon.createStatement();
                        ResultSet R=S.executeQuery(query);
                        while (R.next()){
                                idsAndClients.put(R.getString(1),R.getString(2));
                        }
                        R.close();
                        S.close();
                }
                catch (SQLException e){
                        System.err.println("SQLException: " + e.getMessage());
                        System.err.println("SQLState:     " + e.getSQLState());
                        System.err.println("Couldn't get all indices/client_names pairs from table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
                        System.exit(2);                                                                 
                }
                return idsAndClients;
        }
        
        /**
         * To get client_id for a certain idx and key
         * @param key the key name
         * @param idx the id value for that key (either a String or an int)
         * @return the client_id for node that has the data for the idx for that key
         */
        //TODO will need to change the query. In general this method would return more than 1 client_id if the idx is not unique
        public <T> int getHostId4Idx (String key,T idx) { 
                int hostId=0;
                this.setKey(key);
                String query;
                int countCids=0;
                query="SELECT count(client_id) FROM "+keyTable+" WHERE "+key+"='"+idx+"';";
                countCids=this.mCon.getIntFromDb(query);
                if (countCids!=1){
                        System.err.println("the query was: "+query);
                        System.err.println("Error! the count of client_ids for idx "+key+"= "+idx+" is " +countCids+
                                        ". It must be 1! The values were taken from host: "+MASTERHOST+", database: "+MASTERDB+", table: "+keyTable+". Check what's wrong! Exiting now.");
                        System.exit(2);
                }
                else {
                        query="SELECT client_id FROM "+keyTable+" WHERE "+key+"='"+idx+"';";
                        hostId=this.mCon.getIntFromDb(query);
                }
                return hostId;
        }
        
        // next 4 methods here refer purely to numeric keys, won't change them to be general text/numeric
        public void insertIdxInMaster(String key, int clientId) {
                String query;
                this.setKey(key);
                try {
                        query="INSERT INTO "+this.keyTable+" (client_id) VALUES ("+clientId+");";
                        this.mCon.executeSql(query);
                } 
                catch (SQLException E) {
                        System.err.println("SQLException: " + E.getMessage());
                        System.err.println("SQLState:     " + E.getSQLState());
                        System.err.println("Couldn't insert new "+this.key+" in master table "+this.getKeyTable()+". The client_id for it was "+clientId+". Exiting.");
                        System.exit(2);
                } 
        }

        public void insertIdxInMaster(String keySrc,String keyDest,int idxSrc) {
                this.setKey(keySrc);
                int clientId=0;
                clientId=this.getHostId4Idx(keySrc,idxSrc);
                insertIdxInMaster(keyDest,clientId);
        }

        public int getLastInsertId(String key) {
                int lastIdx=0;
                this.setKey(key);
                String query = "";
                query = "SELECT LAST_INSERT_ID() FROM "+this.keyTable+" LIMIT 1;";
                lastIdx=this.mCon.getIntFromDb(query);
                return lastIdx;
        }
        
        public int[][] getIdxSet(String key) { 
                int[][] indMatrix=null;
                this.setKey(key);
                String query;
                Statement S;
                ResultSet R;
                try {
                        // STEP 1 -- getting set of all client_ids                      
                        query="SELECT count(distinct client_id) FROM "+keyTable+";";
                        int count=0;
                        count=this.mCon.getIntFromDb(query);
                        S=this.mCon.createStatement();
                        query="SELECT DISTINCT client_id FROM "+keyTable+" ORDER BY client_id;";
                        R=S.executeQuery(query);
                        
                        // STEP 2 -- putting sets of indices counts into temp tables c_<client_id> with a serial auto_increment field
                        int[] clids=new int[count]; //array to store all client_ids. To be used in loops later
                        int i=0;
                        while (R.next()){
                                Statement Sloop=this.mCon.createStatement();
                                int clid=R.getInt(1);
                                query="CREATE TEMPORARY TABLE c_"+clid+" (serial int(11) NOT NULL AUTO_INCREMENT,"+key+" int(11),client_id int(11), PRIMARY KEY(serial));";                             
                                Sloop.executeUpdate(query);
                                query="INSERT INTO c_"+clid+" ("+key+",client_id) SELECT "+key+",client_id FROM "+keyTable+" WHERE client_id="+clid+";";
                                Sloop.executeUpdate(query);
                                clids[i]=clid;
                                i++;
                                Sloop.close();
                        }
                        
                        // STEP3 -- merging all c_<client_id> tables into a temp table tmp_allcs and selecting the client_id with the maximum count
                        //query="SELECT client_id,count(*) as c FROM c_34 GROUP BY client_id UNION SELECT client_id,count(*) as c FROM c_32 GROUP BY client_id;";
                        query="DROP TABLE IF EXISTS tmp_allcs;"; 
                        S.executeUpdate(query);
                        //this table must be permanent! otherwise cannot do the select max(c) later
                        query="CREATE TABLE IF NOT EXISTS tmp_allcs (client_id int(11), c int(11)) ENGINE=MEMORY;";
                        S.executeUpdate(query);
                        String unionStr="SELECT client_id,count(*) AS c FROM c_"+clids[0]+" GROUP BY client_id";
                        for (i=1;i<clids.length;i++) {
                                unionStr+=" UNION SELECT client_id,count(*) AS c FROM c_"+clids[i]+" GROUP BY client_id";
                        }
                        query="INSERT INTO tmp_allcs "+unionStr+";";
                        S.executeUpdate(query);
                        query="SELECT client_id,c FROM tmp_allcs WHERE c=(SELECT max(c) FROM tmp_allcs);";
                        R=S.executeQuery(query);
                        int clidMaxIdxCount=0;
                        int maxIdxCount=0;
                        if (R.next()) {
                                clidMaxIdxCount=R.getInt(1);
                                maxIdxCount=R.getInt(2);
                        }
                        query="DROP TABLE tmp_allcs;";
                        S.executeUpdate(query);
                        
                        // STEP 4 -- join all c_<client_id> tables into a table with a serial column, and c_<client_id> columns each of them with the indices for each client_id 
                        //query="SELECT c_34.serial,c_34.asu_id AS c_34,c_32.asu_id AS c_32,c_36.asu_id AS c_36 FROM c_34 LEFT JOIN c_32 ON (c_34.serial=c_32.serial) LEFT JOIN c_36 ON (c_34.serial=c_36.serial);";
                        String selectStr="c_"+clidMaxIdxCount+".serial, c_"+clidMaxIdxCount+"."+key+" AS c_"+clidMaxIdxCount;
                        String fromStr="c_"+clidMaxIdxCount;
                        for (i=0;i<clids.length;i++) {
                                if (clids[i]!=clidMaxIdxCount){
                                        selectStr+=", c_"+clids[i]+"."+key+" AS c_"+clids[i];
                                        fromStr+=" LEFT JOIN c_"+clids[i]+" ON (c_"+clidMaxIdxCount+".serial=c_"+clids[i]+".serial)";
                                }
                        } 
                        query="CREATE TEMPORARY TABLE indices_matrix "+"SELECT "+selectStr+" FROM "+fromStr+";";
                        S.executeUpdate(query);
                        
                        // STEP 5 -- put the table into a 2-dimensional array and return it
                        indMatrix = new int[maxIdxCount][clids.length];
                        query="SELECT * FROM indices_matrix";
                        R=S.executeQuery(query);
                        i=0;
                        while (R.next()) {
                                for (int j=0;j<clids.length;j++){
                                        indMatrix[i][j]=R.getInt(j+2);
                                }
                                i++;
                        }
                        R.close();
                        S.close();
                }
                catch (SQLException e){
                        System.err.println("SQLException: " + e.getMessage());
                        System.err.println("SQLState:     " + e.getSQLState());
                        System.err.println("Couldn't get the indices set from columnn "+key+" in table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
                        System.exit(2);                                                                 
                }
                return indMatrix;
        }

        
}
Revision:	492
Committed:	Wed Jan 2 13:18:57 2008 UTC (17 years, 1 month ago) by duarte
File size:	15419 byte(s)
Log Message:	Copied the aglappe-jung branch into trunk.
Line	File contents
1	package tools;
2	import java.sql.*;
3	import java.util.ArrayList;
4	import java.util.HashMap;
5
6	/**
7	* ClusterConnection class to wrap the master/node mysql servers so that is transparent to other programs
8	* @author Jose Duarte
9	*/
10
11	public class ClusterConnection {
12
13	private String MASTERDB=DataDistribution.KEYMASTERDB;
14	private final String MASTERHOST=DataDistribution.MASTER;
15	private MySQLConnection nCon;
16	private MySQLConnection mCon;
17	public String keyTable;
18	public String key;
19	public String host;
20	public String db;
21	private String user;
22	private String password;
23
24	/**
25	* Create a ClusterConnection passing a key.
26	* @param db the database name
27	* @param key the key name: e.g. asu_id
28	* @param user the user name for connection to both master and nodes
29	* @param password the password for connection to both master and nodes
30	* @throws SQLException
31	*/
32	public ClusterConnection (String db,String key, String user,String password) throws SQLException {
33	setDb(db);
34	setUser(user);
35	setPassword(password);
36	// For nCon we create a connection to the master too.
37	// This is just a place holder because the actual node connection is not created until we create the statement
38	// If we don't do this then when closing the two connections an exception might occurr because we try to close a non existing object
39	this.nCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
40	this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
41	this.key=key; //can't use the setKey method here before we've got the db field initialized
42	setKeyTable(db);
43	}
44
45	/**
46	* Create a ClusterConnection without passing a key. The key will be set later when we call createStatement(key,idx)
47	* @param db the database name
48	* @param user the user name for connection to both master and nodes
49	* @param password the password for connection to both master and nodes
50	* @throws SQLException
51	*/
52	public ClusterConnection (String db, String user,String password) throws SQLException {
53	setDb(db);
54	setUser(user);
55	setPassword(password);
56	// For nCon we create a connection to the master too.
57	// This is just a place holder because the actual node connection is not created until we create the statement
58	// If we don't do this then when closing the two connections an exception might occurr because we try to close a non existing object
59	this.nCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
60	this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
61	}
62
63	public void close() {
64	this.nCon.close();
65	this.mCon.close();
66	}
67
68	public <T> String getHost4Idx (T idx) {
69	String host="";
70	String query = "SELECT client_name FROM "+keyTable+" AS m INNER JOIN clients_names AS c "+
71	"ON (m.client_id=c.client_id) WHERE "+key+"='"+idx+"';";
72	host=this.mCon.getStringFromDb(query);
73	return host;
74	}
75
76	public <T> void setHostFromIdx(T idx) throws SQLException{
77	setHost(getHost4Idx(idx));
78	}
79
80	public void setHost(String host) throws SQLException {
81	this.host=host;
82	//Closing previous connection is essential
83	//If we don't close it a lot of connections stay open after using a ClusterConnection object for a while
84	this.nCon.close();
85	this.nCon = new MySQLConnection(host,user,password,db);
86	}
87
88	/**
89	* This method is strictly private. We shouldn't call this from another class as a key might not be set when we call it
90	* and thus we can't get the client_id from the master key table. Only to be called from createStatement(key,idx)
91	* @param idx the value of the id for a certain key already set
92	* @return a Stament object with a connection to the node that contains idx for key
93	* @throws SQLException
94	*/
95	private <T> Statement createStatement(T idx) throws SQLException { // to use when the field "key" is already set
96	setKeyTable();
97	Statement S=null;
98	this.setHostFromIdx(idx);
99	try {
100	S=this.nCon.createStatement();
101	}
102	catch (SQLException e){
103	System.err.println("SQLException: " + e.getMessage());
104	System.err.println("SQLState: " + e.getSQLState());
105	System.err.println("Couldn't create statement for the node connection, idx= "+idx+", exiting.");
106	System.exit(2);
107	}
108	return S;
109	}
110
111	/**
112	* This method is used to create a statement passing the key and idx. It will create a connection the the right node
113	* and return a Statement for that connection
114	* @param idx the key name
115	* @param idx the id value for that key
116	* @return a Statement object with a connection to the node that contains idx for key
117	* @throws SQLException
118	*/
119	public <T> Statement createStatement(String key,T idx) throws SQLException {
120	setKey(key);
121	return createStatement(idx);
122	}
123
124	/**
125	* To execute a sql update/insert query in the right node given a query, key and idx. Just a shortcut not to have to do the create statement and execute
126	* @param query the SQL query
127	* @param key the name of the key
128	* @param idx the id value for that key
129	*/
130	public <T> void executeSql(String query,String key, T idx) throws SQLException {
131	Statement stmt;
132	stmt = this.createStatement(key,idx);
133	stmt.execute(query);
134	stmt.close();
135	}
136
137	/**
138	* To change the MASTERDB String, i.e. the name of the key master database. To be used in testing.
139	* @param db the name of the key master db we want to use instead of the default defined in the MASTERDB field
140	* @throws SQLException
141	*/
142	public void setKeyDb(String db) throws SQLException {
143	this.MASTERDB=db;
144	//Closing previous connection is essential
145	this.mCon.close();
146	this.mCon = new MySQLConnection(MASTERHOST,user,password,MASTERDB);
147	}
148
149	/**
150	* To set keyTable field in constructor (i.e. first time). Only to be used in constructor.
151	* @param db the database name
152	*/
153	public void setKeyTable(String db) {
154	String query="SELECT key_master_table FROM dbs_keys WHERE db=\'"+db+"\' AND key_name=\'"+this.key+"\';";
155	this.keyTable=this.mCon.getStringFromDb(query);
156	}
157
158	/**
159	* To set the keyTable field when db is already set
160	* The value of keyTable is taken from the dbs_keys table in the database given the db and key.
161	*/
162	public void setKeyTable() {
163	String query="SELECT key_master_table FROM dbs_keys WHERE db=\'"+this.db+"\' AND key_name=\'"+this.key+"\';";
164	this.keyTable=this.mCon.getStringFromDb(query);
165	}
166
167	public String getKeyTable() {
168	return this.keyTable;
169	}
170
171	/**
172	* To get the name of the target table where splitted data is stored in nodes, e.g. for keyTable pdbgraph__asu_list, we get asu_list
173	* @return
174	*/
175	public String getTableOnNode(){
176	String table="";
177	if (this.keyTable.contains("__")) {
178	String[] tokens=this.keyTable.split("__");
179	table=tokens[1];
180	}
181	else {
182	System.err.println("Error! The keyTable field is not set in this ClusterConnection object.");
183	}
184	return table;
185	}
186
187	public void setUser(String user) {
188	this.user=user;
189	}
190
191	public void setPassword(String password) {
192	this.password=password;
193	}
194
195	public void setDb(String db){
196	this.db=db;
197	}
198
199	public void setKey(String key){
200	this.key=key;
201	setKeyTable();
202	}
203
204	public Statement createMasterStatement() {
205	Statement S=null;
206	try {
207	S=this.mCon.createStatement();
208	}
209	catch (SQLException e){
210	System.err.println("SQLException: " + e.getMessage());
211	System.err.println("SQLState: " + e.getSQLState());
212	System.err.println("Couldn't create statement for the master connection, exiting.");
213	System.exit(2);
214	}
215	return S;
216	}
217
218	public Object[] getAllIdxFromMaster(String key) {
219	this.setKey(key);
220	Object[] ids=null;
221	ArrayList<Object> idsAL=new ArrayList<Object>();
222	try {
223	String query="SELECT "+key+" FROM "+keyTable+";";
224	Statement S=this.mCon.createStatement();
225	ResultSet R=S.executeQuery(query);
226	while (R.next()){
227	idsAL.add(R.getInt(1));
228	}
229	R.close();
230	S.close();
231	}
232	catch (SQLException e){
233	System.err.println("SQLException: " + e.getMessage());
234	System.err.println("SQLState: " + e.getSQLState());
235	System.err.println("Couldn't get all indices from columnn "+key+" in table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
236	System.exit(2);
237	}
238	ids=new Object[idsAL.size()];
239	for (int i=0;i<idsAL.size();i++){
240	ids[i]=idsAL.get(i);
241	}
242	return ids;
243	}
244
245	/**
246	* To get all ids and clients_names pairs for a certain key. Useful when need to submit to all hosts using qsub -q
247	* @param key the name of the key
248	* @return HashMap with keys = indices, and values = node names where the corresponding index is stored
249	*/
250	public HashMap<Object,String> getAllIdxAndClients (String key){
251	this.setKey(key);
252	HashMap<Object,String> idsAndClients=new HashMap<Object,String>();
253	try {
254	String query="SELECT a."+key+",c.client_name FROM "+keyTable+" AS a INNER JOIN clients_names AS c ON (a.client_id=c.client_id);";
255	Statement S=this.mCon.createStatement();
256	ResultSet R=S.executeQuery(query);
257	while (R.next()){
258	idsAndClients.put(R.getString(1),R.getString(2));
259	}
260	R.close();
261	S.close();
262	}
263	catch (SQLException e){
264	System.err.println("SQLException: " + e.getMessage());
265	System.err.println("SQLState: " + e.getSQLState());
266	System.err.println("Couldn't get all indices/client_names pairs from table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
267	System.exit(2);
268	}
269	return idsAndClients;
270	}
271
272	/**
273	* To get client_id for a certain idx and key
274	* @param key the key name
275	* @param idx the id value for that key (either a String or an int)
276	* @return the client_id for node that has the data for the idx for that key
277	*/
278	//TODO will need to change the query. In general this method would return more than 1 client_id if the idx is not unique
279	public <T> int getHostId4Idx (String key,T idx) {
280	int hostId=0;
281	this.setKey(key);
282	String query;
283	int countCids=0;
284	query="SELECT count(client_id) FROM "+keyTable+" WHERE "+key+"='"+idx+"';";
285	countCids=this.mCon.getIntFromDb(query);
286	if (countCids!=1){
287	System.err.println("the query was: "+query);
288	System.err.println("Error! the count of client_ids for idx "+key+"= "+idx+" is " +countCids+
289	". It must be 1! The values were taken from host: "+MASTERHOST+", database: "+MASTERDB+", table: "+keyTable+". Check what's wrong! Exiting now.");
290	System.exit(2);
291	}
292	else {
293	query="SELECT client_id FROM "+keyTable+" WHERE "+key+"='"+idx+"';";
294	hostId=this.mCon.getIntFromDb(query);
295	}
296	return hostId;
297	}
298
299	// next 4 methods here refer purely to numeric keys, won't change them to be general text/numeric
300	public void insertIdxInMaster(String key, int clientId) {
301	String query;
302	this.setKey(key);
303	try {
304	query="INSERT INTO "+this.keyTable+" (client_id) VALUES ("+clientId+");";
305	this.mCon.executeSql(query);
306	}
307	catch (SQLException E) {
308	System.err.println("SQLException: " + E.getMessage());
309	System.err.println("SQLState: " + E.getSQLState());
310	System.err.println("Couldn't insert new "+this.key+" in master table "+this.getKeyTable()+". The client_id for it was "+clientId+". Exiting.");
311	System.exit(2);
312	}
313	}
314
315	public void insertIdxInMaster(String keySrc,String keyDest,int idxSrc) {
316	this.setKey(keySrc);
317	int clientId=0;
318	clientId=this.getHostId4Idx(keySrc,idxSrc);
319	insertIdxInMaster(keyDest,clientId);
320	}
321
322	public int getLastInsertId(String key) {
323	int lastIdx=0;
324	this.setKey(key);
325	String query = "";
326	query = "SELECT LAST_INSERT_ID() FROM "+this.keyTable+" LIMIT 1;";
327	lastIdx=this.mCon.getIntFromDb(query);
328	return lastIdx;
329	}
330
331	public int[][] getIdxSet(String key) {
332	int[][] indMatrix=null;
333	this.setKey(key);
334	String query;
335	Statement S;
336	ResultSet R;
337	try {
338	// STEP 1 -- getting set of all client_ids
339	query="SELECT count(distinct client_id) FROM "+keyTable+";";
340	int count=0;
341	count=this.mCon.getIntFromDb(query);
342	S=this.mCon.createStatement();
343	query="SELECT DISTINCT client_id FROM "+keyTable+" ORDER BY client_id;";
344	R=S.executeQuery(query);
345
346	// STEP 2 -- putting sets of indices counts into temp tables c_<client_id> with a serial auto_increment field
347	int[] clids=new int[count]; //array to store all client_ids. To be used in loops later
348	int i=0;
349	while (R.next()){
350	Statement Sloop=this.mCon.createStatement();
351	int clid=R.getInt(1);
352	query="CREATE TEMPORARY TABLE c_"+clid+" (serial int(11) NOT NULL AUTO_INCREMENT,"+key+" int(11),client_id int(11), PRIMARY KEY(serial));";
353	Sloop.executeUpdate(query);
354	query="INSERT INTO c_"+clid+" ("+key+",client_id) SELECT "+key+",client_id FROM "+keyTable+" WHERE client_id="+clid+";";
355	Sloop.executeUpdate(query);
356	clids[i]=clid;
357	i++;
358	Sloop.close();
359	}
360
361	// STEP3 -- merging all c_<client_id> tables into a temp table tmp_allcs and selecting the client_id with the maximum count
362	//query="SELECT client_id,count() as c FROM c_34 GROUP BY client_id UNION SELECT client_id,count() as c FROM c_32 GROUP BY client_id;";
363	query="DROP TABLE IF EXISTS tmp_allcs;";
364	S.executeUpdate(query);
365	//this table must be permanent! otherwise cannot do the select max(c) later
366	query="CREATE TABLE IF NOT EXISTS tmp_allcs (client_id int(11), c int(11)) ENGINE=MEMORY;";
367	S.executeUpdate(query);
368	String unionStr="SELECT client_id,count(*) AS c FROM c_"+clids[0]+" GROUP BY client_id";
369	for (i=1;i<clids.length;i++) {
370	unionStr+=" UNION SELECT client_id,count(*) AS c FROM c_"+clids[i]+" GROUP BY client_id";
371	}
372	query="INSERT INTO tmp_allcs "+unionStr+";";
373	S.executeUpdate(query);
374	query="SELECT client_id,c FROM tmp_allcs WHERE c=(SELECT max(c) FROM tmp_allcs);";
375	R=S.executeQuery(query);
376	int clidMaxIdxCount=0;
377	int maxIdxCount=0;
378	if (R.next()) {
379	clidMaxIdxCount=R.getInt(1);
380	maxIdxCount=R.getInt(2);
381	}
382	query="DROP TABLE tmp_allcs;";
383	S.executeUpdate(query);
384
385	// STEP 4 -- join all c_<client_id> tables into a table with a serial column, and c_<client_id> columns each of them with the indices for each client_id
386	//query="SELECT c_34.serial,c_34.asu_id AS c_34,c_32.asu_id AS c_32,c_36.asu_id AS c_36 FROM c_34 LEFT JOIN c_32 ON (c_34.serial=c_32.serial) LEFT JOIN c_36 ON (c_34.serial=c_36.serial);";
387	String selectStr="c_"+clidMaxIdxCount+".serial, c_"+clidMaxIdxCount+"."+key+" AS c_"+clidMaxIdxCount;
388	String fromStr="c_"+clidMaxIdxCount;
389	for (i=0;i<clids.length;i++) {
390	if (clids[i]!=clidMaxIdxCount){
391	selectStr+=", c_"+clids[i]+"."+key+" AS c_"+clids[i];
392	fromStr+=" LEFT JOIN c_"+clids[i]+" ON (c_"+clidMaxIdxCount+".serial=c_"+clids[i]+".serial)";
393	}
394	}
395	query="CREATE TEMPORARY TABLE indices_matrix "+"SELECT "+selectStr+" FROM "+fromStr+";";
396	S.executeUpdate(query);
397
398	// STEP 5 -- put the table into a 2-dimensional array and return it
399	indMatrix = new int[maxIdxCount][clids.length];
400	query="SELECT * FROM indices_matrix";
401	R=S.executeQuery(query);
402	i=0;
403	while (R.next()) {
404	for (int j=0;j<clids.length;j++){
405	indMatrix[i][j]=R.getInt(j+2);
406	}
407	i++;
408	}
409	R.close();
410	S.close();
411	}
412	catch (SQLException e){
413	System.err.println("SQLException: " + e.getMessage());
414	System.err.println("SQLState: " + e.getSQLState());
415	System.err.println("Couldn't get the indices set from columnn "+key+" in table "+keyTable+" from "+MASTERDB+" database in "+MASTERHOST+", exiting.");
416	System.exit(2);
417	}
418	return indMatrix;
419	}
420
421
422	}