thredds.inventory.bdb.MetadataManager Maven / Gradle / Ivy
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The NetCDF-Java Library is a Java interface to NetCDF files,
as well as to many other types of scientific data formats.
/*
* Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
* Access and use of this software shall impose the following obligations
* and understandings on the user. The user is granted the right, without
* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
* documentation for any purpose whatsoever, provided that this entire
* notice appears in all copies of the software, derivative works and
* supporting documentation. Further, UCAR requests that the user credit
* UCAR/Unidata in any publications that result from the use of this
* software or in any product that includes this software. The names UCAR
* and/or Unidata, however, may not be used in any advertising or publicity
* to endorse or promote any products or commercial entity unless specific
* written permission is obtained from UCAR/Unidata. The user also
* understands that UCAR/Unidata is not obligated to provide the user with
* any support, consulting, training or assistance of any kind with regard
* to the use, operation and performance of this software nor to provide
* the user with any updates, revisions, new versions or "bug fixes."
*
* THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package thredds.inventory.bdb;
import com.sleepycat.je.*;
import java.io.*;
import java.util.*;
import thredds.inventory.MFile;
/**
* MetadataManager using Berkeley DB Java Edition.
* Single environment, with multiple databases.
* All threads share one environment; multiple processes can only have one writer at a time.
* Each collection is a "database".
* Each database has a set of key/value pairs.
* default root dir is ${user.home}/.unidata/bdb
* default TDS uses {tomcat_home}/content/thredds/cache/collection
*
* @author caron
* @since Aug 20, 2008
*/
public class MetadataManager {
private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(MetadataManager.class);
private static final String UTF8 = "UTF-8";
private static String root = null;
private static Environment myEnv = null;
private static List openDatabases = new ArrayList();
private static boolean readOnly = false;
private static boolean debug = false;
private static boolean debugDelete = false;
static {
String home = System.getProperty("user.home");
if (home == null)
home = System.getProperty("user.dir");
if (home == null)
home = ".";
root = home + "/.unidata/bdb/";
}
static public void setCacheDirectory(String dir) {
root = dir;
}
static private synchronized void setup() throws DatabaseException {
if (myEnv != null) return; // someone else did it
EnvironmentConfig myEnvConfig = new EnvironmentConfig();
myEnvConfig.setReadOnly(false);
myEnvConfig.setAllowCreate(true);
myEnvConfig.setSharedCache(true);
File dir = new File(root);
if (!dir.exists() && !dir.mkdirs())
logger.warn("MetadataManager failed to make directory " + root);
try {
myEnv = new Environment(dir, myEnvConfig); // LOOK may want to try multiple Environments
logger.info("MetadataManager opened bdb in directory=" + dir);
readOnly = false;
} catch (com.sleepycat.je.EnvironmentLockedException e) {
// another process has it open: try read-only
logger.warn("MetadataManager failed to open directory, try read-only");
readOnly = true;
myEnvConfig.setReadOnly(true);
myEnvConfig.setAllowCreate(false);
myEnv = new Environment(dir, myEnvConfig);
}
logger.info("MetadataManager: open bdb at root "+root+" readOnly = " +readOnly);
/* primary
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setAllowCreate(true);
dbConfig.setDeferredWrite(true);
database = myEnv.openDatabase(null, "primaryDatabase", dbConfig);
/* secondary
SecondaryKeyCreator keyCreator = new SecondaryKeyCreator(new DataBinding());
SecondaryConfig secConfig = new SecondaryConfig();
secConfig.setAllowCreate(!readOnly);
secConfig.setSortedDuplicates(!readOnly);
secConfig.setKeyCreator(keyCreator);
secondary = myEnv.openSecondaryDatabase(null, "secDatabase", database, secConfig); */
}
// Close all databases and environment
// this is called on TDS shutdown and reinit
static synchronized public void closeAll() {
List closeDatabases = new ArrayList(openDatabases);
for (MetadataManager mm : closeDatabases) {
if (debug) System.out.println(" close database " + mm.collectionName);
mm.close();
}
openDatabases = new ArrayList(); // empty
if (myEnv != null) {
try {
// Finally, close the store and environment.
myEnv.close();
myEnv = null;
logger.info("closed bdb caching");
} catch (DatabaseException dbe) {
logger.error("Error closing bdb: ", dbe);
}
}
}
static public void showEnvStats(Formatter f) {
if (myEnv == null)
setup();
try {
EnvironmentStats stats = myEnv.getStats(null);
f.format("EnvironmentStats%n%s%n", stats);
f.format("%nDatabaseNames%n");
for (String dbName : myEnv.getDatabaseNames()) {
f.format(" %s%n", dbName);
}
} catch (DatabaseException e) {
e.printStackTrace();
}
}
static public String getCacheLocation() {
return root;
}
static public void sync() {
if (myEnv != null)
myEnv.sync();
}
static public List getCollectionNames() {
if (myEnv == null)
setup();
return myEnv.getDatabaseNames();
}
static public void deleteCollection(String collectionName) throws Exception {
// close any open handles
for (MetadataManager mm : openDatabases) {
if (mm.collectionName.equals(collectionName)) {
if (mm.database != null)
mm.database.close();
}
}
myEnv.removeDatabase(null, collectionName);
}
static public void delete(String collectionName, String key) {
try {
MetadataManager mm = new MetadataManager(collectionName);
mm.delete(key);
mm.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
////////////////////////////////////////////////////
private String collectionName;
private Database database;
//private SecondaryDatabase secondary;
//private Calendar cal = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
//private DateFormatter dateFormatter = new DateFormatter();
public MetadataManager(String collectionName) throws DatabaseException, IOException {
this.collectionName = collectionName;
// fail fast
if (myEnv == null) {
setup();
}
}
// assumes only one open at a time; could have MetadataManagers share open databases
private void openDatabase() {
if (database != null) return;
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setReadOnly(readOnly);
dbConfig.setAllowCreate(!readOnly);
if (!readOnly)
dbConfig.setDeferredWrite(true);
database = myEnv.openDatabase(null, collectionName, dbConfig);
openDatabases.add(this);
}
public void put(String key, String value) {
if (readOnly) return;
openDatabase();
try {
database.put(null, new DatabaseEntry(key.getBytes(UTF8)), new DatabaseEntry(value.getBytes(UTF8)));
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e.getMessage());
}
}
public void put(byte[] key, byte[] value) {
if (readOnly) return;
openDatabase();
database.put(null, new DatabaseEntry(key), new DatabaseEntry(value));
}
public void put(String key, byte[] value) {
if (readOnly) return;
openDatabase();
try {
database.put(null, new DatabaseEntry(key.getBytes(UTF8)), new DatabaseEntry(value));
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e.getMessage());
}
}
public byte[] get(byte[] key) {
openDatabase();
DatabaseEntry value = new DatabaseEntry();
database.get(null, new DatabaseEntry(key), value, LockMode.DEFAULT);
return value.getData();
}
public byte[] getBytes(String key) {
openDatabase();
try {
DatabaseEntry value = new DatabaseEntry();
database.get(null, new DatabaseEntry(key.getBytes(UTF8)), value, LockMode.DEFAULT);
return value.getData();
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
public String get(String key) {
openDatabase();
try {
DatabaseEntry value = new DatabaseEntry();
OperationStatus status = database.get(null, new DatabaseEntry(key.getBytes(UTF8)), value, LockMode.DEFAULT);
if (status == OperationStatus.SUCCESS)
return new String(value.getData(), UTF8);
else
return null;
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
public void delete(String theKey) {
if (readOnly) {
logger.warn("Cant dekete - readOnly mode");
return;
}
openDatabase();
try {
DatabaseEntry entry = new DatabaseEntry(theKey.getBytes("UTF-8"));
database.delete(null, entry);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void delete(Map current) {
if (readOnly) {
logger.warn("Cant dekete - readOnly mode");
return;
}
openDatabase();
List result = new ArrayList();
Cursor myCursor = null;
try {
myCursor = database.openCursor(null, null);
DatabaseEntry foundKey = new DatabaseEntry();
DatabaseEntry foundData = new DatabaseEntry();
int count = 0;
while (myCursor.getNext(foundKey, foundData, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
String key = new String(foundKey.getData(), UTF8);
int pos = key.indexOf('#');
if (pos > 0) {
String filename = key.substring(0, pos);
if (null == current.get(filename)) {
//System.out.printf("%s not current %n", filename);
result.add(new DatabaseEntry(foundKey.getData()));
count++;
} else {
//System.out.printf("%s is current%n", filename);
}
}
}
//System.out.printf("total found to delete = %d%n", count);
if (debugDelete) {
for (DatabaseEntry entry : result) {
OperationStatus status = database.delete(null, entry);
String key = new String(entry.getData(), UTF8);
System.out.printf("%s deleted %s%n", status, key);
}
}
} catch (UnsupportedOperationException e) {
logger.error("Trying to delete " + collectionName, e);
} catch (UnsupportedEncodingException e) {
logger.error("Trying to delete " + collectionName, e);
} finally {
if (null != myCursor)
myCursor.close();
}
}
public void close() {
if (database != null) {
database.close();
openDatabases.remove(this);
database = null;
}
}
public void showStats(Formatter f) {
openDatabase();
try {
DatabaseStats dstats = database.getStats(null);
f.format("primary stats %n%s%n", dstats);
} catch (DatabaseException e) {
e.printStackTrace();
}
}
public List getContent() throws DatabaseException, UnsupportedEncodingException {
openDatabase();
List result = new ArrayList();
Cursor myCursor = null;
try {
myCursor = database.openCursor(null, null);
DatabaseEntry foundKey = new DatabaseEntry();
DatabaseEntry foundData = new DatabaseEntry();
//int count = 0;
while (myCursor.getNext(foundKey, foundData, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
String key = new String(foundKey.getData(), UTF8);
String data = new String(foundData.getData(), UTF8);
result.add(new KeyValue(key, data));
//System.out.printf("key = %s; data = %s %n", key, data);
//count++;
}
//System.out.printf("count = %d %n", count);
} finally {
if (null != myCursor)
myCursor.close();
}
return result;
}
public class KeyValue {
public String key;
public String value;
KeyValue(String key, String value) {
this.key = key;
this.value = value;
}
}
public static void main(String args[]) throws Exception {
MetadataManager indexer = new MetadataManager("dummy");
indexer.showStats(new Formatter(System.out));
MetadataManager.closeAll();
}
}
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