java - How would you test a Connection Pool -

-

i have implemented simple connectionpool in java. has no fancy features, get/release connection methods.

how can test working?

i know there plenty of connection pools ready use out there, more reliable i'll do, trying practice understand how connections pool work.

thank you!

here code in case helps:

public class connectionpoolimpl implements connectionpool {     private vector<pooledconnection> connections; // connections container     string url;     string username;      string password;      /**      * instanciates new mysqlconnectionpool      * @param nbconnectionsmax      */     public connectionpoolimpl(string dburl, string username, string password){         this.connections = new vector<pooledconnection>();         this.url = dburl;         this.username = username;         this.password = password;     }      /**      * returns connection pool, if available, or create new one.      *       * @return connection.      */     public connection getconnection() throws sqlexception {         synchronized(this.connections){             // checking if there available connection return             for(pooledconnection c : this.connections){                 if(!c.isused()){                     c.setused();                     return c.getconnection();                 }             }              // if there none, open new 1 , return             connection conn = drivermanager.getconnection(url, username, password);         pooledconnection pconn = new pooledconnection(conn);         pconn.setused();         connections.add(pconn);         return pconn.getconnection();         }     }      /**      * releases connection pool.      *       * @param con connection release.      */     public void releaseconnection(connection con) throws sqlexception {         synchronized(this.connections){             for(pooledconnection c : this.connections){                 if(c.getconnection().equals(con)){                     c.setfree();                     return;                 }             }         }       } }

and pooledconnection.java:

public class pooledconnection {     private connection conn;     private boolean used;      public pooledconnection(connection conn){         this.conn = conn;         this.used = false;     }      public void setused(){         this.used = true;     }      public void setfree(){         this.used = false;     }      public boolean isused(){         return this.used;     }      public connection getconnection(){         return this.conn;     } }

you test

  • getting connection when pool empty gives connection
  • getting connection when connection has been got , not released gives another, different connection
  • releasing connection doesn't throw exception
  • getting connection after 1 has been released gives same connection

note such unit test need real database, real user , password test. make connection pool depend on datasource, , build connectionpool using mock datasource returning mock connections, in order able test class without depending on real database.


Comments

Post a Comment

Popular posts from this blog

c# - How to set Z index when using WPF DrawingContext? -

-
how set z-index drawing object when using drawingcontext.drawxxx() methods? the object drawn last have higher z index. can't change index of drawn objects. way draw in order. if using wpf (as placed tag), can use, example, canvas control. create shapes need like polyline obj = new polyline(); //... // ... set properties of obj and add them canvas uielementcollection: yourcanvasname.children.add(obj); //or yourcanvasname.children.insert(i, obj); first items of collection have higher z index. advantages in way: no need redraw on window changes, can anytime move objects , change order.
Read more

razor - Is this a bug in WebMatrix PageData? -

-
i think may have found bug in webmatrix's pagedata, not sure. concerns how pass data partial page calling page. in webmatrix documentation (tutorials, e.g. " 3 - creating consistent look ", , example code), pagedata recommended mechanism pass data between pages (e.g. content page layout page, or partial page). however have found not work other way, pass data partial page calling page. modifying or adding entries in pagedata in partial page, not seem calling page. cutting right down simplest possible example, in test page may have this: @{ pagedata["test"] = "initial entry"; } <p>before calling partial page, test value @pagedata["test"]</p> @renderpage("_testpartial.cshtml") <p>after returning calling page, test value @pagedata["test"]</p> and in _testpartial.cshtml page might have this: @{ pagedata["test"] = "modified entry"; } <p>in partial page...
Read more

visual c++ - Using relative values in array sorting ( asm ) -

-
i need sort through array , sort each individual row in array in ascending order. doesn't seem going (surprise!) keep getting hit 2 errors: a2101: cannot add 2 relocatable labels , a2026: constant expected here's sort, makes sense me, think i'm still trying implement high-lvl language techniqes assembly. there way around not being able use relative values? (the array 7 rows 9 columns, btw). mov cx, 7; cx = number of rows outer: ; outer loop walk through rows push cx mov cx, 9 mov row, cx ;rows middle: ; middle-loop walk through columns push cx sub cx, 1 ;cx = cx-1 mov column, cx ;columns inner: ;inner loop - compare , exchange column values cmp marray[row*9 + column], marray[row*9 + column+1] xchg marray[row*9 + column+1], marray[row*9 + column] ; compare , exchange values marray table inc column loop inner pop cx loop mid...
Read more