db/update/Service: add SimpleDatabase reference

Don't use the global variables from the DatabaseSimple library.

src/Main.cxx

@@ -68,6 +68,7 @@
 #include "db/update/Service.hxx"
 #include "db/DatabaseGlue.hxx"
 #include "db/DatabaseSimple.hxx"
+#include "db/plugins/SimpleDatabasePlugin.hxx"
 #endif
 
 #ifdef ENABLE_NEIGHBOR_PLUGINS
@@ -460,7 +461,7 @@ int mpd_main(int argc, char *argv[])
 	const bool create_db = !glue_db_init_and_load();
 
 	instance->update = db_is_simple()
-		? new UpdateService(*main_loop)
+		? new UpdateService(*main_loop, db_get_simple())
 		: nullptr;
 #endif
 

src/db/DatabaseGlue.cxx

@@ -95,23 +95,13 @@ db_is_simple(void)
 	return is_simple;
 }
 
-Directory *
-db_get_root(void)
+SimpleDatabase &
+db_get_simple()
 {
+	assert(is_simple);
 	assert(db != nullptr);
-	assert(db_is_simple());
 
-	return ((SimpleDatabase *)db)->GetRoot();
-}
-
-bool
-db_save(Error &error)
-{
-	assert(db != nullptr);
-	assert(db_is_open);
-	assert(db_is_simple());
-
-	return ((SimpleDatabase *)db)->Save(error);
+	return *(SimpleDatabase *)db;
 }
 
 bool

src/db/DatabaseSimple.hxx

@@ -22,12 +22,9 @@
 
 #include "Compiler.h"
 
-#include <sys/time.h>
-
 struct config_param;
 struct Directory;
-struct db_selection;
-struct db_visitor;
+class SimpleDatabase;
 class Error;
 
 /**
@@ -38,21 +35,9 @@ class Error;
 bool
 db_is_simple(void);
 
-/**
- * Returns the root directory object.  Returns NULL if there is no
- * configured music directory.
- *
- * May only be used if db_is_simple() returns true.
- */
 gcc_pure
-Directory *
-db_get_root(void);
-
-/**
- * May only be used if db_is_simple() returns true.
- */
-bool
-db_save(Error &error);
+SimpleDatabase &
+db_get_simple();
 
 /**
  * Returns true if there is a valid database file on the disk.

src/db/plugins/SimpleDatabasePlugin.hxx

@@ -59,6 +59,10 @@ public:
 
 	bool Save(Error &error);
 
+	bool FileExists() const {
+		return mtime > 0;
+	}
+
 	static Database *Create(EventLoop &loop, DatabaseListener &listener,
 				const config_param &param,
 				Error &error);

src/db/update/Service.hxx

@@ -26,6 +26,8 @@
 #include "event/DeferredMonitor.hxx"
 #include "thread/Thread.hxx"
 
+class SimpleDatabase;
+
 /**
  * This class manages the update queue and runs the update thread.
  */
@@ -36,6 +38,8 @@ class UpdateService final : DeferredMonitor {
 		UPDATE_PROGRESS_DONE = 2
 	};
 
+	SimpleDatabase &db;
+
 	Progress progress;
 
 	bool modified;
@@ -53,7 +57,7 @@ class UpdateService final : DeferredMonitor {
 	UpdateWalk walk;
 
 public:
-	UpdateService(EventLoop &_loop);
+	UpdateService(EventLoop &_loop, SimpleDatabase &_db);
 
 	/**
 	 * Returns a non-zero job id when we are currently updating

src/db/update/UpdateGlue.cxx

@@ -20,7 +20,7 @@
 #include "config.h"
 #include "Service.hxx"
 #include "UpdateDomain.hxx"
-#include "db/DatabaseSimple.hxx"
+#include "db/plugins/SimpleDatabasePlugin.hxx"
 #include "Idle.hxx"
 #include "util/Error.hxx"
 #include "Log.hxx"
@@ -44,12 +44,12 @@ UpdateService::Task()
 
 	SetThreadIdlePriority();
 
-	modified = walk.Walk(*db_get_root(), next.path_utf8.c_str(),
+	modified = walk.Walk(*db.GetRoot(), next.path_utf8.c_str(),
 			     next.discard);
 
-	if (modified || !db_exists()) {
+	if (modified || !db.FileExists()) {
 		Error error;
-		if (!db_save(error))
+		if (!db.Save(error))
 			LogError(error, "Failed to save database");
 	}
 
@@ -146,8 +146,7 @@ UpdateService::RunDeferred()
 	}
 }
 
-UpdateService::UpdateService(EventLoop &_loop)
-	:DeferredMonitor(_loop), walk(_loop)
+UpdateService::UpdateService(EventLoop &_loop, SimpleDatabase &_db)
+	:DeferredMonitor(_loop), db(_db), walk(_loop)
 {
-	assert(db_is_simple());
 }