For Michael Pfeiffer, ready for beta...

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1108 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/print/ResourceManager.cpp

@@ -0,0 +1,104 @@
+/*****************************************************************************/
+// ResourceManager
+//
+// Author
+//   Michael Pfeiffer
+//
+// This application and all source files used in its construction, except 
+// where noted, are licensed under the MIT License, and have been written 
+// and are:
+//
+// Copyright (c) 2002 OpenBeOS Project
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+// and/or sell copies of the Software, and to permit persons to whom the 
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included 
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+/*****************************************************************************/
+
+#include "ResourceManager.h"
+
+#include <Debug.h>
+#include <Autolock.h>
+
+Resource::Resource(const char* transport, const char* address, const char* connection) 
+	: fTransport(transport)
+	, fTransportAddress(address)
+	, fConnection(connection)
+	, fResourceAvailable(0)
+
+{
+	if (NeedsLocking()) {
+		fResourceAvailable = create_sem(1, "resource");
+	}
+}
+
+Resource::~Resource() {
+	if (fResourceAvailable > 0) delete_sem(fResourceAvailable);
+}
+
+bool Resource::NeedsLocking() {
+	return !(fTransport == "Print to File" || fTransport == "NONE"); 
+}
+
+bool Resource::Equals(const char* transport, const char* address, const char* connection) {
+	return fTransport == transport &&
+			fTransportAddress == address &&
+			fConnection == connection;
+}
+
+bool Resource::Lock() {
+	if (fResourceAvailable > 0) {
+		return acquire_sem(fResourceAvailable) == B_NO_ERROR;
+	}
+	return true;
+}
+
+void Resource::Unlock() {
+	if (fResourceAvailable > 0) {
+		release_sem(fResourceAvailable);
+	}
+}
+
+ResourceManager::~ResourceManager() {
+	ASSERT(fResources.CountItems() == 0);
+}
+
+Resource* ResourceManager::Find(const char* transport, const char* address, const char* connection) {
+	for (int i = 0; i < fResources.CountItems(); i ++) {
+		Resource* r = fResources.ItemAt(i);
+		if (r->Equals(transport, address, connection)) return r;
+	}
+	return NULL;
+}
+
+Resource* ResourceManager::Allocate(const char* transport, const char* address, const char* connection) {
+	Resource* r = Find(transport, address, connection);
+	if (r == NULL) {
+		r = new Resource(transport, address, connection);
+		fResources.AddItem(r);
+	} else {
+		r->Acquire();
+	}
+	return r;
+}
+
+
+void ResourceManager::Free(Resource* r) {
+	if (r->Release()) {
+		fResources.RemoveItem(r);
+	}	
+}