The atg.vfs.switchable.SwitchableLocalFileSystem class is a VFS implementation that switches between two underlying local file systems and keeps a journal of changes made. Instances of this class are used to Configure Default Target VFSs for Switch Deployments (ConfigFileSystem and WWWFileSystem) and also to Configure Custom Target VFSs for Switch Deployments.
Property | Description |
|---|---|
| The live directory that contains the files used by external facilities. No other VFS on the server can use this directory. See liveDirectory/stagingDirectory Constraints below this table. |
| The inactive directory where file updates are made before performing a switch. No other VFS on the server can use this directory. See liveDirectory/stagingDirectory Constraints below this table. |
| A dynamically-created directory that stores internal data used during deployments. No other VFS on the server can use this directory. |
| Indicates whether to write VFS modifications to a journal. Note: This property is used only by a switchable ConfigFileSystem VFS for the purpose of updating personalization and scenario assets on a target. |
| The list of event listeners that listen for events that indicate the VFS is updated in a deployment. Note: This property is used only by a switchable ConfigFileSystem VFS for the purpose of updating personalization and scenario assets on a target. |
| The logical name of the underlying file system to use as the live VFS at initial application startup. This property is analogous to the All switchable VFSs in the target must specify the same name in this property. The name must match the name in the |
| The logical name of the underlying file system to be used as the inactive VFS at initial application start-up. All switchable VFSs in the target must specify the same name in this property. |
| Turns on checksum caching for this VFS, which can be used to improve deployment times for systems where large numbers of file assets are being deployed. See Cache Checksums for File Assets for more information on the checksum caching properties in this service. |
| Used if checksum caching is enabled. Specifies the encoding used to save the cache data (UTF-8, by default). See Cache Checksums for File Assets for more information. |
| Enables background deletion if set to true. By default, this property is set to false (see Background Deletion of File System Assets). |
| Sets the deletion thread’s priority. In general, you should let the system set thread priority, and omit this property |
| Specifies in milliseconds how long the deletion thread waits before it begins to delete files from the temporary directory. If set to 0 (the default), deletion begins immediately. |
liveDirectory/stagingDirectory Constraints
The following constraints apply:
Each
liveDirectoryandstagingDirectorydirectory must be reserved for the exclusive use of a single VFS.liveDirectoryandstagingDirectorydirectories must be on the same UNIX partition.ConfigFileSystem only: The live directory must be located on the application’s configuration path.
WWWFileSystem only:
The live directory must be located in the Web server’s document root directory or one of its subdirectories.
The live directory must not store files used by other services; it should contain only files deployed from the asset management server’s WWWFileSystem.
Data Sources
Collectively, the name1 and name2 properties are analogous to the dataSources property of a SwitchingDataSource used by a repository, as they identify the underlying data stores used by the switchable data store—in this case, a switchable VFS. The labels used in these properties must correspond to those used for each SwitchingDataSource.
For example, if you configured each SwitchingDataSource as follows:
dataSources=\ Red=/atg/dynamo/service/jdbc/Pool1,\ Blue=/atg/dynamo/service/jdbc/Pool2
Then the name1 and name2 properties in each SwitchableLocalFileSystem must be configured as follows:
name1=Red name2=Blue
The /atg/epub/DeploymentServer uses the logical names for all underlying data stores (for all repositories and VFSs) to verify that all agents in the target performed each switch deployment successfully, or, more specifically, to verify that all agents are using the same underlying store as their live store and likewise the same underlying store as their staging store.
Read-only properties
A SwitchableLocalFileSystem also has two read-only properties that identify the current live and staging directories: liveDataStoreName and stagingDataStoreName, respectively. These properties indicate the current state of the VFS.
