1 files changed, 181 insertions, 0 deletions
diff --git a/java/demo/Database/library/SQLRequestContext.java b/java/demo/Database/library/SQLRequestContext.java
new file mode 100644
index 00000000000..533e74be491
--- /dev/null
+++ b/java/demo/Database/library/SQLRequestContext.java
@@ -0,0 +1,181 @@
+// **********************************************************************
+//
+// Copyright (c) 2003-2009 ZeroC, Inc. All rights reserved.
+//
+// This copy of Ice is licensed to you under the terms described in the
+// ICE_LICENSE file included in this distribution.
+//
+// **********************************************************************
+
+//
+// A SQL request context encapsulates SQL resources allocated in the
+// process of executing a request, such as the database connection,
+// and associated SQL statements.
+//
+// The request context is automatically destroyed at the end of a
+// request, or if obtain is called it must be destroyed manually by
+// calling destroy.
+//
+// When the request context is destroyed, the transaction is either
+// automatically committed or rolled back, depending whether the
+// request executed successfully.
+//
+class SQLRequestContext
+{
+    public static SQLRequestContext
+    getCurrentContext()
+    {
+        synchronized(_contextMap)
+        {
+            return _contextMap.get(Thread.currentThread());
+        }
+    }
+
+    public static void
+    initialize(Ice.Logger logger, ConnectionPool pool)
+    {
+        assert _logger == null;
+        assert _pool == null;
+
+        _logger = logger;
+        _pool = pool;
+    }
+
+    public java.sql.PreparedStatement
+    prepareStatement(String sql)
+        throws java.sql.SQLException
+    {
+        java.sql.PreparedStatement stmt = _conn.prepareStatement(sql);
+        _statements.add(stmt);
+        return stmt;
+    }
+
+    public java.sql.PreparedStatement
+    prepareStatement(String sql, int autoGeneratedKeys)
+        throws java.sql.SQLException
+    {
+        java.sql.PreparedStatement stmt = _conn.prepareStatement(sql, autoGeneratedKeys);
+        _statements.add(stmt);
+        return stmt;
+    }
+
+    // Called to obtain ownership of the context. The context is no
+    // longer destroyed automatically when the current request has
+    // completed.
+    public void
+    obtain()
+    {
+        if(_trace)
+        {
+            _logger.trace("SQLRequestContext", "obtain context: " + this +
+                          " thread: " + Thread.currentThread());
+        }
+        _obtain = true;
+    }
+
+    public void
+    destroy(boolean commit)
+    {
+        // Must only be called on an obtained context.
+        assert _obtain;
+        destroyInternal(commit);
+    }
+
+    public void
+    error(String prefix, Exception ex)
+    {
+        java.io.StringWriter sw = new java.io.StringWriter();
+        java.io.PrintWriter pw = new java.io.PrintWriter(sw);
+        ex.printStackTrace(pw);
+        pw.flush();
+        _logger.error(prefix + ": error:\n" + sw.toString());
+    }
+
+    SQLRequestContext()
+    {
+        _conn = _pool.acquire();
+
+        synchronized(_contextMap)
+        {
+            if(_trace)
+            {
+                _logger.trace("SQLRequestContext", "create new context: " + this +
+                              " thread: " + Thread.currentThread() +
+                              ": connection: " + _conn);
+            }
+
+            _contextMap.put(Thread.currentThread(), this);
+        }
+    }
+
+    // Called only during the dispatch process.
+    void
+    destroyFromDispatch(boolean commit)
+    {
+        synchronized(_contextMap)
+        {
+            // Remove the current context from the thread->context
+            // map.
+            SQLRequestContext context = _contextMap.remove(Thread.currentThread());
+            assert context != null;
+        }
+
+        // If the context was obtained then don't destroy.
+        if(!_obtain)
+        {
+            destroyInternal(commit);
+        }
+    }
+
+    private void
+    destroyInternal(boolean commit)
+    {
+        // Release all resources.
+        try
+        {
+            if(commit)
+            {
+                _conn.commit();
+                if(_trace)
+                {
+                    _logger.trace("SQLRequestContext", "commit context: " + this);
+                }
+            }
+            else
+            {
+                _conn.rollback();
+                if(_trace)
+                {
+                    _logger.trace("SQLRequestContext", "rollback context: " + this);
+                }
+            }
+
+            java.util.Iterator<java.sql.Statement> p = _statements.iterator();
+            while(p.hasNext())
+            {
+                p.next().close();
+            }
+        }
+        catch(java.sql.SQLException e)
+        {
+            error("SQLRequestContext", e);
+        }
+
+        _pool.release(_conn);
+
+        _statements.clear();
+        _conn = null;
+    }
+
+    // A map of threads to request contexts.
+    private static java.util.Map<Thread, SQLRequestContext> _contextMap =
+        new java.util.HashMap<Thread, SQLRequestContext>();
+
+    private static Ice.Logger _logger = null;
+    private static ConnectionPool _pool = null;
+
+    private boolean _trace = true;
+    private java.util.List<java.sql.Statement> _statements = new java.util.LinkedList<java.sql.Statement>();
+    private java.sql.Connection _conn;
+    private boolean _obtain = false;
+}