Package org.apache.felix.framework.cache

Class BundleCache

java.lang.Object

org.apache.felix.framework.cache.BundleCache

public class BundleCache
extends java.lang.Object

This class, combined with BundleArchive, and concrete BundleRevision subclasses, implement the Felix bundle cache. It is possible to configure the default behavior of this class by passing properties into Felix' constructor. The configuration properties for this class are (properties starting with "felix" are specific to Felix, while those starting with "org.osgi" are standard OSGi properties):

• felix.cache.filelimit - The integer value of this string sets an upper limit on how many files the cache will open. The default value is zero, which means there is no limit.
• org.osgi.framework.storage - Sets the directory to use as the bundle cache; by default bundle cache directory is felix-cache in the current working directory. The value should be a valid directory name. The directory name can be either absolute or relative. Relative directory names are relative to the current working directory. The specified directory will be created if it does not exist.
• felix.cache.rootdir - Sets the root directory to use to calculate the bundle cache directory for relative directory names. If org.osgi.framework.storage is set to a relative name, by default it is relative to the current working directory. If this property is set, then it will be calculated as being relative to the specified root directory.
• felix.cache.locking - Enables or disables bundle cache locking, which is used to prevent concurrent access to the bundle cache. This is enabled by default, but on older/smaller JVMs file channel locking is not available; set this property to false to disable it.
• felix.cache.bufsize - Sets the buffer size to be used by the cache; the default value is 4096. The integer value of this string provides control over the size of the internal buffer of the disk cache for performance reasons.

For specific information on how to configure the Felix framework, refer to the Felix framework usage documentation.

See Also:

BundleArchive

Field Summary

Fields

Modifier and Type	Field	Description
protected static int	BUFSIZE
static java.lang.String	CACHE_BUFSIZE_PROP
static java.lang.String	CACHE_FILELIMIT_PROP
static java.lang.String	CACHE_LOCKING_PROP
static java.lang.String	CACHE_ROOTDIR_PROP
static java.lang.String	CACHE_SINGLEBUNDLEFILE_PROP

Constructor Summary

Constructors

Constructor	Description
BundleCache(Logger logger, java.util.Map configMap)

Method Summary

Modifier and Type	Method	Description
BundleArchive	create(long id, int startLevel, java.lang.String location, java.io.InputStream is)
void	delete()
BundleArchive[]	getArchives()
java.io.File	getSystemBundleDataFile(java.lang.String fileName)	Provides the system bundle access to its private storage area; this special case is necessary since the system bundle is not really a bundle and therefore must be treated in a special way.
void	release()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

CACHE_BUFSIZE_PROP

public static final java.lang.String CACHE_BUFSIZE_PROP

See Also:

Constant Field Values

CACHE_ROOTDIR_PROP

public static final java.lang.String CACHE_ROOTDIR_PROP

See Also:

Constant Field Values

CACHE_LOCKING_PROP

public static final java.lang.String CACHE_LOCKING_PROP

See Also:

Constant Field Values

CACHE_FILELIMIT_PROP

public static final java.lang.String CACHE_FILELIMIT_PROP

See Also:

Constant Field Values

CACHE_SINGLEBUNDLEFILE_PROP

public static final java.lang.String CACHE_SINGLEBUNDLEFILE_PROP

See Also:

Constant Field Values

BUFSIZE

protected static transient int BUFSIZE

Constructor Detail

BundleCache

public BundleCache(Logger logger,
                   java.util.Map configMap)
            throws java.lang.Exception

Throws:

java.lang.Exception

Method Detail

release

public void release()

delete

public void delete()
            throws java.lang.Exception

Throws:

java.lang.Exception

getArchives

public BundleArchive[] getArchives()
                            throws java.lang.Exception

Throws:

java.lang.Exception

create

public BundleArchive create(long id,
                            int startLevel,
                            java.lang.String location,
                            java.io.InputStream is)
                     throws java.lang.Exception

Throws:

java.lang.Exception

getSystemBundleDataFile

public java.io.File getSystemBundleDataFile(java.lang.String fileName)
                                     throws java.lang.Exception

Provides the system bundle access to its private storage area; this special case is necessary since the system bundle is not really a bundle and therefore must be treated in a special way.

Parameters:

fileName - the name of the file in the system bundle's private area.

Returns:

a File object corresponding to the specified file name.

Throws:

java.lang.Exception - if any error occurs.