From c30eddb243e7e65f67f656e62848a033cf6f2e5c Mon Sep 17 00:00:00 2001
From: Richard Purdie <richard@openedhand.com>
Date: Tue, 30 Sep 2008 15:08:33 +0000
Subject: Add bitbake-dev to allow ease of testing and development of bitbake
 trunk

git-svn-id: https://svn.o-hand.com/repos/poky/trunk@5337 311d38ba-8fff-0310-9ca6-ca027cbcb966
---
 bitbake-dev/lib/bb/persist_data.py | 110 +++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 bitbake-dev/lib/bb/persist_data.py

(limited to 'bitbake-dev/lib/bb/persist_data.py')

diff --git a/bitbake-dev/lib/bb/persist_data.py b/bitbake-dev/lib/bb/persist_data.py
new file mode 100644
index 0000000000..79e7448bee
--- /dev/null
+++ b/bitbake-dev/lib/bb/persist_data.py
@@ -0,0 +1,110 @@
+# BitBake Persistent Data Store
+#
+# Copyright (C) 2007        Richard Purdie
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+import bb, os
+
+try:
+    import sqlite3
+except ImportError:
+    try:
+        from pysqlite2 import dbapi2 as sqlite3
+    except ImportError:
+        bb.msg.fatal(bb.msg.domain.PersistData, "Importing sqlite3 and pysqlite2 failed, please install one of them. Python 2.5 or a 'python-pysqlite2' like package is likely to be what you need.")
+
+sqlversion = sqlite3.sqlite_version_info
+if sqlversion[0] < 3 or (sqlversion[0] == 3 and sqlversion[1] < 3):
+    bb.msg.fatal(bb.msg.domain.PersistData, "sqlite3 version 3.3.0 or later is required.")
+
+class PersistData:
+    """
+    BitBake Persistent Data Store
+
+    Used to store data in a central location such that other threads/tasks can 
+    access them at some future date.
+
+    The "domain" is used as a key to isolate each data pool and in this 
+    implementation corresponds to an SQL table. The SQL table consists of a 
+    simple key and value pair.
+
+    Why sqlite? It handles all the locking issues for us.
+    """
+    def __init__(self, d):
+        self.cachedir = bb.data.getVar("PERSISTENT_DIR", d, True) or bb.data.getVar("CACHE", d, True)
+        if self.cachedir in [None, '']:
+            bb.msg.fatal(bb.msg.domain.PersistData, "Please set the 'PERSISTENT_DIR' or 'CACHE' variable.")
+        try:
+            os.stat(self.cachedir)
+        except OSError:
+            bb.mkdirhier(self.cachedir)
+
+        self.cachefile = os.path.join(self.cachedir,"bb_persist_data.sqlite3")
+        bb.msg.debug(1, bb.msg.domain.PersistData, "Using '%s' as the persistent data cache" % self.cachefile)
+
+        self.connection = sqlite3.connect(self.cachefile, timeout=5, isolation_level=None)
+
+    def addDomain(self, domain):
+        """
+        Should be called before any domain is used
+        Creates it if it doesn't exist.
+        """
+        self.connection.execute("CREATE TABLE IF NOT EXISTS %s(key TEXT, value TEXT);" % domain)
+
+    def delDomain(self, domain):
+        """
+        Removes a domain and all the data it contains
+        """
+        self.connection.execute("DROP TABLE IF EXISTS %s;" % domain)
+
+    def getValue(self, domain, key):
+        """
+        Return the value of a key for a domain
+        """
+        data = self.connection.execute("SELECT * from %s where key=?;" % domain, [key])
+        for row in data:
+            return row[1]
+
+    def setValue(self, domain, key, value):
+        """
+        Sets the value of a key for a domain
+        """
+        data = self.connection.execute("SELECT * from %s where key=?;" % domain, [key])
+        rows = 0
+        for row in data:
+            rows = rows + 1
+        if rows:
+            self._execute("UPDATE %s SET value=? WHERE key=?;" % domain, [value, key])
+        else:
+            self._execute("INSERT into %s(key, value) values (?, ?);" % domain, [key, value])
+
+    def delValue(self, domain, key):
+        """
+        Deletes a key/value pair
+        """
+        self._execute("DELETE from %s where key=?;" % domain, [key])
+
+    def _execute(self, *query):
+        while True:	
+            try:
+                self.connection.execute(*query)
+                return
+            except sqlite3.OperationalError, e:
+                if 'database is locked' in str(e):
+                    continue
+                raise
+        
+        
+
-- 
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