public CassandraBinaryStore(String address) {
this.address = address;
this.cache = TransientBinaryStore.get();
}
/**
* A {@link BinaryStore} implementation that does not persist the binary values beyond the lifetime
* of the virtual machine. This implementation extends {@link FileSystemBinaryStore} and uses a
* temporary directory. Thus, the binary values are not stored in-memory.
*/
@ThreadSafe
public final class TransientBinaryStore extends FileSystemBinaryStore {
private static final String JAVA_IO_TMPDIR = "java.io.tmpdir";
private static final String JBOSS_SERVER_DATA_DIR = "jboss.server.data.dir";
private static final TransientBinaryStore INSTANCE = new TransientBinaryStore();
protected static final File TRANSIENT_STORE_DIRECTORY = INSTANCE.getDirectory();
/**
* Obtain a shared {@link TransientBinaryStore} instance.
*
* @return the instance; never null
*/
public static TransientBinaryStore get() {
return INSTANCE;
}
/**
* Obtain a new temporary directory that can be used by a transient binary store. Note that none
* of the directories are actually created at this time, but are instead created (if needed)
* during {@link #initializeStorage(File)}.
*
* @return the new directory; never null
*/
private static File newTempDirectory() {
String tempDirName = System.getProperty(JAVA_IO_TMPDIR);
if (tempDirName == null) {
throw new SystemFailureException(
JcrI18n.tempDirectorySystemPropertyMustBeSet.text(JAVA_IO_TMPDIR));
}
File tempDir = new File(tempDirName);
if (System.getProperty(JBOSS_SERVER_DATA_DIR) == null) {
// We're not running in JBoss AS (where we always specify the directory where the binaries are
// stored),
// so log where the temporary directory is ...
Logger.getLogger(TransientBinaryStore.class)
.info(JcrI18n.tempDirectoryLocation, tempDir.getAbsolutePath());
}
// Create a temporary directory in the "java.io.tmpdir" directory ...
return new File(tempDir, "modeshape-binary-store");
}
/** Create a new transient binary store. */
private TransientBinaryStore() {
super(newTempDirectory());
}
/**
* Ensures that the directory used by this binary store exists and can be both read and written
* to.
*
* @throws BinaryStoreException if the directory cannot be written to, read, or (if needed)
* created
*/
@Override
protected void initializeStorage(File directory) throws BinaryStoreException {
if (!directory.exists()) {
Logger.getLogger(getClass())
.debug(
"Creating temporary directory for transient binary store: {0}",
directory.getAbsolutePath());
directory.mkdirs();
}
if (!directory.canRead()) {
throw new BinaryStoreException(
JcrI18n.unableToReadTemporaryDirectory.text(directory.getAbsolutePath(), JAVA_IO_TMPDIR));
}
if (!directory.canWrite()) {
throw new BinaryStoreException(
JcrI18n.unableToWriteTemporaryDirectory.text(
directory.getAbsolutePath(), JAVA_IO_TMPDIR));
}
}
}