Examples of com.sleepycat.je.Environment

com.sleepycat.je.Environment
an environment handle with default attributes. Environment env = new Environment(home, new EnvironmentConfig()); or
```
 Environment env = new Environment(home, null); 
```
Note that many Environment objects may access a single environment.

To create an environment or customize attributes, the application should customize the configuration class. For example:
```
 EnvironmentConfig envConfig = new EnvironmentConfig(); envConfig.setTransactional(true); envConfig.setAllowCreate(true); envConfig.setCacheSize(1000000); Environment newlyCreatedEnv = new Environment(home, envConfig); 
```
Note that environment configuration parameters can also be set through the <environment home>/je.properties file. This file takes precedence over any programmatically specified configuration parameters so that configuration changes can be made without recompiling. Environment configuration follows this order of precedence:
1. Configuration parameters specified in <environment home>/je.properties take first precedence.
2. Configuration parameters set in the EnvironmentConfig object used at Environment construction are next.
3. Any configuration parameters not set by the application are set to system defaults, described along with the parameter name String constants in the EnvironmentConfig class.
An environment handle is an Environment instance. More than one Environment instance may be created for the same physical directory, which is the same as saying that more than one Environment handle may be open at one time for a given environment.
The Environment handle should not be closed while any other handle remains open that is using it as a reference (for example, {@link com.sleepycat.je.Database Database} or {@link com.sleepycat.je.Transaction Transaction}. Once {@link com.sleepycat.je.Environment#close Environment.close} is called, this object may not be accessed again.


        if (binMaxEntries <= 0) {
            binMaxEntries = nodeMaxEntries;
        }


        final Environment env = openCalcEnvironment(true);
        boolean success = false;
        try {
            envOverhead = env.getStats(null).getCacheTotalBytes();


            final int density = orderedInsertion ?
                ORDERED_DENSITY :
                DEFAULT_DENSITY;
    
            final int nodeAvg = (nodeMaxEntries * density) / 100;
            final int binAvg = (binMaxEntries * density) / 100;
            final long nBinNodes = (records + binAvg - 1) / binAvg;
            calcTreeSizes(env, nodeAvg, binAvg);


            /* Bottom level. */
            numLevel[0] = nBinNodes;
            minLevel[0] = nBinNodes * minBinSize;
            maxLevel[0] = nBinNodes * maxBinSize;
            btreeLevels = 1;


            /* Upper levels. */
            for (long nodes = (long) (nBinNodes / nodeAvg);; nodes /= nodeAvg) {
                if (btreeLevels >= MAX_LEVELS) {
                    throw new IllegalArgumentException
                        ("Maximum levels (" + MAX_LEVELS + ") exceeded.");
                }
                if (nodes == 0) {
                    nodes = 1; // root
                }
                numLevel[btreeLevels] = nodes;
                minLevel[btreeLevels] = nodes * minInSize;
                maxLevel[btreeLevels] = nodes * maxInSize;
                btreeLevels += 1;
                if (nodes == 1) {
                    break;
                }
            }


            /* Totals without data. */
            minBtreeSize = 0;
            maxBtreeSize = 0;
            for (int level = 0; level < btreeLevels; level += 1) {
                minBtreeSize += minLevel[level];
                maxBtreeSize += maxLevel[level];
            }


            /* Totals with data. */
            minBtreeSizeWithData = nBinNodes * minBinSizeWithData;
            maxBtreeSizeWithData = nBinNodes * maxBinSizeWithData;
            for (int level = 1; level < btreeLevels; level += 1) {
                minBtreeSizeWithData += minLevel[level];
                maxBtreeSizeWithData += maxLevel[level];
            }
            success = true;
        } finally {


            /*
             * Do not propgate exception thrown by Environment.close if another
             * exception is currently in flight.
             */
            try {
                env.close();
            } catch (RuntimeException e) {
                if (success) {
                    throw e;
                }
            }

View Full Code Here

     * For testing, insert the specified data set and initialize the
     * measuredBtreeSize and measuredBtreeSizeWithData fields.
     */
    void measure(final PrintStream out) {


        Environment env = openMeasureEnvironment(true);
        try {
            Database db = openDatabase(env, true);


            if (out != null) {
                out.println("\nMeasuring with cache size: " +
                            INT_FORMAT.format(env.getConfig().getCacheSize()));
            }
            insertRecords(out, env, db);
            measuredBtreeSize = getStats(out, env, "Stats after insert");


            db.close();
            db = null;
            env.close();
            env = null;


            env = openMeasureEnvironment(false);
            db = openDatabase(env, false);


            if (out != null) {
                out.println("\nPreloading with cache size: " +
                            INT_FORMAT.format(env.getConfig().getCacheSize()));
            }
            PreloadStatus status = preloadRecords(out, db, false /*loadLNs*/);
            getStats
                (out, env, "Stats for internal nodes only after preload (" +
                 status + ")");
            if (dataSize >= 0) {
                status = preloadRecords(out, db, true /*loadLNs*/);
                measuredBtreeSizeWithData = getStats
                    (out, env, "Stats for all nodes after preload (" +
                     status + ")");
            }
            db.close();
            db = null;
            env.close();
            env = null;
        } finally {


            /*
             * Do not propgate exception thrown by Environment.close if another
             * exception is currently in flight.
             */
            if (env != null) {
                try {
                    env.close();
                } catch (RuntimeException ignore) {
                }
            }
        }
    }

View Full Code Here

            if (!repParams.isEmpty()) {
                throw new IllegalArgumentException
                    ("Cannot set replication params in a standalone " +
                     "environment.  May add -replicated.");
            }
            return new Environment(tempDir, config);
        }
    }

View Full Code Here

        DbSpace space = new DbSpace();
        space.parseArgs(argv);


        EnvironmentConfig envConfig = new EnvironmentConfig();
        envConfig.setReadOnly(true);
        Environment env = new Environment(space.envHome, envConfig);
        space.initEnv(DbInternal.getEnvironmentImpl(env));


        try {
            space.print(System.out);
            System.exit(0);
        } catch (Throwable e) {
            e.printStackTrace(System.err);
            System.exit(1);
        } finally {
            try {
                env.close();
            } catch (Throwable e) {
                e.printStackTrace(System.err);
                System.exit(1);
            }
        }

View Full Code Here

        throws Exception {


        if (env == null) {
            EnvironmentConfig envConfig = new EnvironmentConfig();
            envConfig.setReadOnly(openReadOnly);
            env = new Environment(envHome, envConfig);
        }
    }

View Full Code Here

         EnvironmentConfig envConfig = new EnvironmentConfig();
         envConfig.setAllowCreate(true);
         envConfig.setTransactional(true);
         envConfig.setLockTimeout(1000 * cache.getConfiguration().getLockAcquisitionTimeout()); // these are in nanos
         if (log.isTraceEnabled()) log.trace("Creating JE environment with home dir " + homeDir);
         env = new Environment(homeDir, envConfig);
         if (log.isDebugEnabled()) log.debug("Created JE environment " + env + " for cache loader " + this);
         /* Open cache and catalog databases. */
         openDatabases();
      }
      catch (Exception e)

View Full Code Here

      loader.setConfig(config);
      loader.create();
      loader.start();


      /* Verify the database name by trying to open it. */
      Environment env = new Environment(new File(envHome), null);
      DatabaseConfig dbConfig = new DatabaseConfig();
      dbConfig.setTransactional(transactional);
      Database db = env.openDatabase(null, dbName, dbConfig);
      db.close();
      env.close();
   }

View Full Code Here


        EnvironmentConfig envConfig = new EnvironmentConfig();
        envConfig.setReadOnly(true);
        envConfig.setTransactional(true);
        envConfig.setAllowCreate(false);
        Environment env = new Environment(envDir, envConfig);
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setReadOnly(true);
        dbConfig.setTransactional(true);
        dbConfig.setAllowCreate(false);
        Transaction txn = env.beginTransaction(null, null);
        Database db = env.openDatabase(txn, DbType.REP_GROUP.getInternalName(),
                                       dbConfig);


        DatabaseEntry groupEntry = new DatabaseEntry();
        OperationStatus status =
            db.get(txn, groupKeyEntry, groupEntry, LockMode.READ_COMMITTED);
        if (status != OperationStatus.SUCCESS) {
            throw new IllegalStateException
                ("Group entry not found " + status);
        }
        GroupBinding groupBinding = new GroupBinding();
        RepGroupImpl group = groupBinding.entryToObject(groupEntry);


        group = fetchGroup(group.getName(),
                           DbInternal.getDatabaseImpl(db),
                           DbInternal.getTxn(txn));
        txn.commit();
        db.close();
        env.close();
        return group;
    }

View Full Code Here

     * nested transactions are not supported by the environment.
     */
    public final Transaction beginTransaction(TransactionConfig config)
        throws DatabaseException {


        Environment env = getEnvironment();
        Trans trans = (Trans) localTrans.get();
        if (trans != null) {
            if (trans.txn != null) {
                if (!DbCompat.NESTED_TRANSACTIONS) {
                    throw new IllegalStateException
                        ("Nested transactions are not supported");
                }
                Transaction parentTxn = trans.txn;
                trans = new Trans(trans, config);
                trans.txn = env.beginTransaction(parentTxn, config);
                localTrans.set(trans);
            } else {
                trans.txn = env.beginTransaction(null, config);
                trans.config = config;
            }
        } else {
            trans = new Trans(null, config);
            trans.txn = env.beginTransaction(null, config);
            localTrans.set(trans);
        }
        return trans.txn;
    }

View Full Code Here

         * Initialize an environment configuration, and create an environment.
         */
        EnvironmentConfig envConfig = new EnvironmentConfig();
        envConfig.setReadOnly(true);
        envConfig.setAllowCreate(false);
        Environment env = new Environment(envHome, envConfig);


        List<String> databaseNames = new LinkedList<String>();
        databaseNames.addAll(env.getDatabaseNames());
        for (String dbName : databaseNames) {


            DatabaseConfig dbCfg = new DatabaseConfig();
            dbCfg.setAllowCreate(false);
            dbCfg.setReadOnly(true);
            DbInternal.setUseExistingConfig(dbCfg, true);


            Database db = env.openDatabase(null, dbName, dbCfg);
            out.println("Database: " + dbName + ", Count: " + db.count());
            db.close();
        }


        env.close();
    }

View Full Code Here

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