_Session


1   package com.daffodilwoods.daffodildb.server.sessionsystem;
2   
3   import com.daffodilwoods.daffodildb.server.serversystem.*;
4   import com.daffodilwoods.database.resource.*;
5   
6   import com.daffodilwoods.database.general.*;
7   import java.util.TimeZone  ;
8   import java.sql.*;
9   import java.util.ArrayList  ;
10  import java.util.TreeMap  ;
11  import com.daffodilwoods.daffodildb.server.sql99.common.*;
12  import com.daffodilwoods.daffodildb.utils.*;
13  import com.daffodilwoods.daffodildb.server.sql99.dql.iterator._Iterator;
14  import com.daffodilwoods.daffodildb.server.datasystem.interfaces._Table;
15  import com.daffodilwoods.daffodildb.server.sql99.expression.booleanvalueexpression._SingleTableExecuter;
16  public interface _Session {
17  
18     public final static int ReadUncommitted = java.sql.Connection.TRANSACTION_READ_UNCOMMITTED;
19     public final static int ReadCommitted   = java.sql.Connection.TRANSACTION_READ_COMMITTED;
20     public final static int ReadSessionSerializable = 5;
21     public final static int ReadUnLokedCommitted = 6;
22     public final static int ReadTransactionSerializable = java.sql.Connection.TRANSACTION_SERIALIZABLE;
23     public final static int ReadRepeatable = java.sql.Connection.TRANSACTION_REPEATABLE_READ;
24  
25    /**
26     * Return a condition corresponding to the Isolation Level for the current user session.
27     * @return ParameterisedCondition
28     * @throws DException
29     */
30    public SessionConditionInfo getSessionCondition()throws DException;
31  
32    /**
33     * Returns Session Id on which user is working (current sessionId).
34     * @return Object
35     * @throws DException
36     */
37    public Object   getSessionId() throws DException ;
38    public Object   getParentSessionId() throws DException ;
39  
40    /**
41     * Returns a table for a session user to work on.
42     * @param tableName
43     * @return
44     * @throws DException
45     */
46    public _SessionTable getSessionTable( QualifiedIdentifier tableName ) throws DException;
47  
48    /**
49     * Sets the Isolation level for the session.
50     * @param level
51     * @throws DException
52     */
53    public void setIsolationLevel(int level ) throws DException ;
54  
55    /**
56     * returns the integer corresponding to isolation level of the session.
57     * @return int
58     * @throws DException
59     */
60    public int getIsolationLevel() throws DException ;
61  
62    /**
63     * returns Transaction ID given at the start of a session.
64     * @return Object
65     * @throws DException
66     */
67    public Object   getTransactionIdAtStart() throws DException ;
68  
69    /**
70     * Writes the processed records of the current session in a file on disk.
71     * @param statementExecutionContext
72     * @throws DException
73     */
74    public void commit(_StatementExecutionContext statementExecutionContext) throws DException;
75  
76    /**
77     * rolls back all the operations performed on the records in the session.
78     * @param statementExecutionContext
79     * @throws DException
80     */
81    public void rollback(_StatementExecutionContext statementExecutionContext)  throws DException;
82  
83    /**
84     * returns a Object of Lock Class.
85     * @return Lock
86     * @throws DException
87     */
88    public Lock getLock() throws DException ;
89  
90  
91    /**
92     * returns a Database for the session on which a user is currently working.
93     * @return
94     * @throws DException
95     */
96    public _SessionDatabase getSessionDatabase() throws DException ;
97  
98    /**
99     * will return true if the user passed is the current one.
100    * @param authorizationIdentifier
101    * @return
102    * @throws DException
103    */
104   public boolean isEnabledAuthorizationIdentifier(String   authorizationIdentifier) throws DException ;
105 
106   /**
107    * returns the current role or User.
108    * @return
109    * @throws DException
110    */
111   public String   getAuthorizationIdentifier() throws DException ;
112 
113   /**
114    * returns current role from Session SQL.
115    * @return String
116    * @throws DException
117    */
118   public String   getCurrentRole() throws DException ;
119 
120   /**
121    * returns current User of this session.
122    * @return
123    * @throws DException
124    */
125   public String   getCurrentUser() throws DException ;
126 
127   /**
128    * sets the session Tranaction mode as immiediate or deffered for the session.
129    * @param sessionTransactionMode
130    * @throws DException
131    */
132   public void setTransactionMode( SessionTransactionMode sessionTransactionMode ) throws DException ;
133 
134   /**
135    * returns the session Tranaction mode as immiediate or deffered for the session.
136    * @return SessionTransactionMode
137    * @throws DException
138    */
139   public SessionTransactionMode getTransactionMode() throws DException ;
140 
141   /**
142    * returns the Current Date.
143    * @return Date
144    * @throws DException
145    */
146   public Date getDate() throws DException ;
147 
148   /**
149    * returns the current time.
150    * @return Time
151    * @throws DException
152    */
153   public Time getTime() throws DException ;
154 
155   /**
156    *  returns the current month .
157    * @return int
158    * @throws DException
159    */
160   public int getMonth() throws DException ;
161 
162   /**
163    * returns the current year.
164    * @return int
165    * @throws DException
166    */
167   public int getYear() throws DException ;
168 
169   /**
170    * returns the current hour.
171    * @return int
172    * @throws DException
173    */
174   public int getHour() throws DException ;
175 
176   /**
177    * returns the current minutes.
178    * @return int
179    * @throws DException
180    */
181   public int getMinutes() throws DException ;
182 
183   /**
184    * returns the current seconds.
185    * @return int
186    * @throws DException
187    */
188   public int getSeconds() throws DException ;
189 
190   /**
191    * returns the current time zone.
192    * @return TimeZone
193    * @throws DException
194    */
195   public TimeZone   getTimeZone() throws DException ;
196 
197   /**
198    * Adds or removes the constraint Name to immediateModeConstraints Tree Map according to their mode.
199    * @param constraintName
200    * @param mode
201    * @throws DException
202    */
203   public void setConstraintStatus(Object   constraintName, String   mode) throws DException ;
204 
205   /**
206    * removes the table name from session table list.
207    * @param tableName
208    * @throws DException
209    */
210   public void  removeTable(QualifiedIdentifier tableName)  throws DException;
211 
212   /**
213    * fetches the time stamp from session SQL.
214    * @return TimeStamp
215    * @throws DException
216    */
217   public java.sql.Timestamp   getTimeStamp( ) throws DException ;
218 
219   /**
220    * will add the user or role to a Stack.
221    * @param athrznIdntfr
222    * @throws DException
223    */
224   public void pushAuthorizationIdentifier(AuthorizationIdentifier athrznIdntfr) throws DException ;
225 
226   /**
227    * returns only a list of constraints which are changed from deffered to immeidate for the table.
228    * @param tableName
229    * @return ArrayList
230    * @throws DException
231    */
232   public ArrayList   getImmediateConstriants(QualifiedIdentifier tableName) throws DException ;
233 
234   /**
235    * returns the immeidate constraint
236    * @return TreeMap
237    * @throws DException
238    */
239   public TreeMap   getImmediateConstriants() throws DException ;
240 
241   /**
242    * returns the session constant
243    * @return Object
244    * @throws DException
245    */
246   public Object   getSessionConstant() throws DException ;
247 
248   /**
249    * retruns a Object of GlobalSession.
250    * @return _GloabalSession
251    * @throws DException
252    */
253   public _ServerSession getGlobalSession() throws DException ;
254 
255   /**
256    * Prepare is used for Distributed transactions, it writes the data in memory to a file on disk.
257    * @param statementExecutionContext
258    * @return boolean
259    * @throws DException
260    */
261   boolean prepare(_StatementExecutionContext statementExecutionContext)  throws DException;
262 
263   /**
264    * makes the changes made during prepare statement permanent, (used for distributed transactions)
265    * @param statementExecutionContext
266    * @return boolean
267    * @throws DException
268    */
269   boolean makePersistent(_StatementExecutionContext statementExecutionContext)  throws DException;
270 
271   /**
272    * check the constrains with the one present in the table defenation.
273    * @return boolean
274    * @throws DException
275    */
276   public boolean checkConstraint()throws DException;
277 
278   /**
279    * Sets the value to false so that no constraint checking can take place.
280    * @throws DException
281    */
282   public void stopConstraintChecking()throws DException;
283 
284 
285   /**
286    * will set the User name and place the use name to Stack through pushAuthorizationIdentifier.
287    * @param userName
288    * @throws DException
289    */
290   public void setAuthorizationIdentifier( String   userName )throws DException;
291 
292   /**
293    * removes all the entries from the table list i.e contaning the names of all the table in use of same session.
294    * @throws DException
295    */
296   public void removeAllTables()throws DException;
297 
298   public boolean getImmediateConstriantsForChecking();
299   public boolean getDeferredConstriantsForChecking();
300   public boolean isDataModified() throws DException ;
301   public void startSavePoint() throws DException;
302   public void commitSavePoint(_StatementExecutionContext sec) throws DException;
303   public void rollbackSavePoint(_StatementExecutionContext sec) throws DException;
304   public void releaseSavePoint(_StatementExecutionContext sec) throws DException;
305   public int getNumberOfSavePiontsStarted() throws DException;
306   public Object  [] getRecursiveSessionIds() throws DException;
307   public void hideSavePoint() throws DException;
308   public void unhideSavePoint() throws DException;
309   public void ignoreParallelSavePoint() throws DException ;
310   public void allowParallelSavePoint() throws DException ;
311   public void checkImmediateConstraintsOnCommit() throws DException;
312   public void updateDataModifiedStatus() throws DException;
313   public boolean hasAnyChild() throws DException;
314   public void setRole(String   roleName) throws DException;
315   public void resetTime() throws DException;
316   public void setAutoCommit(boolean autoCommit0) ;
317   public boolean getAutoCommit();
318   public void addTableInChangedTableList(QualifiedIdentifier tableName);
319   public  void startTransaction() throws DException;
320 }
321
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