1 files changed, 261 insertions, 0 deletions
diff --git a/SoftHSMv2/src/lib/object_store/Generation.cpp b/SoftHSMv2/src/lib/object_store/Generation.cpp
new file mode 100644
index 0000000..196dac2
--- /dev/null
+++ b/SoftHSMv2/src/lib/object_store/Generation.cpp
@@ -0,0 +1,261 @@
+/*
+ * Copyright (c) 2013 SURFnet bv
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+ * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*****************************************************************************
+ Generation.cpp
+
+ Helper for generation number handling.
+ *****************************************************************************/
+
+#include "config.h"
+#include "log.h"
+#include "Generation.h"
+
+// Factory
+Generation* Generation::create(const std::string path, bool isToken /* = false */)
+{
+	Generation* gen = new Generation(path, isToken);
+	if ((gen != NULL) && isToken && (gen->genMutex == NULL))
+	{
+		delete gen;
+
+		return NULL;
+	}
+	return gen;
+}
+
+// Destructor
+Generation::~Generation()
+{
+	if (isToken)
+	{
+		MutexFactory::i()->recycleMutex(genMutex);
+	}
+}
+
+// Synchronize from locked disk file
+bool Generation::sync(File &objectFile)
+{
+	if (isToken)
+	{
+		ERROR_MSG("Generation sync() called for a token");
+
+		return false;
+	}
+
+	unsigned long onDisk;
+
+	if (!objectFile.readULong(onDisk))
+	{
+		if (objectFile.isEOF())
+		{
+			onDisk = 0;
+		}
+		else
+		{
+			return false;
+		}
+	}
+
+	currentValue = onDisk;
+
+	return objectFile.seek(0L);
+}
+
+// Check if the target was updated
+bool Generation::wasUpdated()
+{
+	if (isToken)
+	{
+		MutexLocker lock(genMutex);
+
+		File genFile(path);
+
+		if (!genFile.isValid())
+		{
+			return true;
+		}
+
+		genFile.lock();
+
+		unsigned long onDisk;
+
+		if (!genFile.readULong(onDisk))
+		{
+			return true;
+		}
+
+		if (onDisk != currentValue)
+		{
+			currentValue = onDisk;
+			return true;
+		}
+
+		return false;
+	}
+	else
+	{
+		File objectFile(path);
+
+		if (!objectFile.isValid())
+		{
+			return true;
+		}
+
+		objectFile.lock();
+
+		unsigned long onDisk;
+
+		if (!objectFile.readULong(onDisk))
+		{
+			return true;
+		}
+
+		return (onDisk != currentValue);
+	}
+}
+
+// Update
+void Generation::update()
+{
+	pendingUpdate = true;
+}
+
+// Commit
+void Generation::commit()
+{
+	if (isToken)
+	{
+		MutexLocker lock(genMutex);
+
+		File genFile(path, true, true, true, false);
+
+		if (!genFile.isValid())
+		{
+			return;
+		}
+
+		genFile.lock();
+
+		if (genFile.isEmpty())
+		{
+			currentValue++;
+
+			if (currentValue == 0)
+			{
+				currentValue++;
+			}
+
+			pendingUpdate = false;
+
+			(void) genFile.writeULong(currentValue);
+
+			genFile.unlock();
+
+			return;
+		}
+
+		unsigned long onDisk;
+
+		bool bOK = true;
+
+		bOK = bOK && genFile.readULong(onDisk);
+		bOK = bOK && genFile.seek(0L);
+
+		if (pendingUpdate)
+		{
+			onDisk++;
+
+			if (onDisk == 0)
+			{
+				onDisk++;
+			}
+		}
+
+		bOK = bOK && genFile.writeULong(onDisk);
+
+		if (bOK)
+		{
+			currentValue = onDisk;
+
+			pendingUpdate = false;
+		}
+
+		genFile.unlock();
+	}
+}
+
+// Set the current value when read from disk
+void Generation::set(unsigned long onDisk)
+{
+	currentValue = onDisk;
+}
+
+// Return new value
+unsigned long Generation::get()
+{
+	pendingUpdate = false;
+
+	currentValue++;
+
+	if (currentValue == 0)
+	{
+		currentValue = 1;
+	}
+
+	return currentValue;
+}
+
+// Rollback (called when the new value failed to be written)
+void Generation::rollback()
+{
+	pendingUpdate = true;
+
+	if (currentValue != 1)
+	{
+		currentValue--;
+	}
+}
+
+// Constructor
+Generation::Generation(const std::string inPath, bool inIsToken)
+{
+	path = inPath;
+	isToken = inIsToken;
+	pendingUpdate = false;
+	currentValue = 0;
+	genMutex = NULL;
+
+	if (isToken)
+	{
+		genMutex = MutexFactory::i()->getMutex();
+
+		if (genMutex != NULL)
+		{
+			commit();
+		}
+	}
+}