Examples of EnvironmentImpl

com.alphacsp.cit.EnvironmentImpl
@author Yoav Hakman
com.sleepycat.je.dbi.EnvironmentImpl
Underlying Environment implementation. There is a single instance for any database environment opened by the application.
com.sun.corba.ee.impl.corba.EnvironmentImpl
com.sun.corba.se.impl.corba.EnvironmentImpl
org.apache.geronimo.corba.dii.EnvironmentImpl
org.apache.tapestry.internal.services.EnvironmentImpl
A non-threadsafe implementation (expects to use the "perthread" service lifecyle).
org.jbpm.pvm.internal.env.EnvironmentImpl
maintains contextual information for a thread in a set of {@link Context}s.
Introduction

Objects have different lifecycles and different context's (aka scopes). An environment provides the structure to easily manage objects with different contexts.

Examples of contexts are:
- process-engine: The process-engine context is used to store e.g. data sources, session factories and other static resources needed by an application. The process-engine context lives for the complete duration of the {@link EnvironmentFactory}. So if the {@link EnvironmentFactory} is maintained in a static member field, the process-engine context lives for the duration of the application. The same process-engine context is shared for all the Environments produced by one EnvironmentFactory.
- environment: The environment context is used for e.g. a transaction and transactional resources, user authentication. This results in an efficient and configurable use of transactional resources that need to be lazily initialized.
- The environment can accomodate other contexts as well. They can be added and removed dynamically. Examples of other potential contexts are web-request, web-session, web-application, business processDefinition, jobImpl, ...
An environment is typically installed like this
static EnvironmentFactory environmentFactory = new DefaultEnvironmentFactory(); ... EnvironmentImpl environment = environmentFactory.openEnvironment(); try { ... everything available in this block ... } finally { environment.close(); }

Purpose

The first purpose of the environment is to separate the application from the environment. Standard Java and Enterprise Java are quite different and an environment abstraction like this allows for the development of applications that can run in both Standard and Enterprise environments. Also test environments are easier to tweak this way.

A second purpose of the environment is to enable specific to global searching of resources. E.g. you could search for an 'adminEmailAddress' in the contexts 'execution', 'transaction' and 'process-engine' in the given order. That way, a global adminEmailAddress can be specified in the process-engine context and it can be refined in more specific contexts.

Search order

To find an object in the environment, a searchOrder can be specified. A search order is an sequence that specifies the order in which the contexts should be searched.

The default search order is the inverse sequence of how the contexts are added to the environment. This is because in general, we can assume that the more recent a context was added, the more specific it is.

Transaction, username and classloader

Three objects are used so frequently in an environment that they get special treatment:
- Transaction: an abstraction for marking a transaction with setRollbackOnly.
- Classloader: the current class loader.
- Username: the name of the currently authenticated user.
For these special properties, setters are also available. That is to support programmatic injection into the environment. Alternatively, they can be configured in one of the contexts.
@see EnvironmentFactory @author Tom Baeyens

Examples of com.sleepycat.je.dbi.EnvironmentImpl

            h.publish(record);
        }
    }


    private Handler getEnvSpecificConfiguredHandler() {
        EnvironmentImpl envImpl =
            LoggerUtils.envMap.get(Thread.currentThread());


        /*
         * Prefer to lose logging output, rather than risk a
         * NullPointerException if the caller forgets to set and release the
         * environmentImpl.
         */
        if (envImpl == null) {
            return null;
        }


        return envImpl.getConfiguredHandler();
    }

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Examples of com.sleepycat.je.dbi.EnvironmentImpl

                            long truncFileNum, 
                            long truncOffset) 
        throws IOException {


        /* Make a read/write environment */
        EnvironmentImpl envImpl =
            CmdUtil.makeUtilityEnvironment(env, false);
        
        /* Go through the file manager to get the JE file. Truncate. */
        envImpl.getFileManager().truncateLog(truncFileNum, truncOffset);


        envImpl.close();
    }

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Examples of com.sleepycat.je.dbi.EnvironmentImpl

        if (progressInterval > 0) {
            verifyConfig.setShowProgressInterval(progressInterval);
            verifyConfig.setShowProgressStream(out);
        }


        EnvironmentImpl envImpl = DbInternal.getEnvironmentImpl(env);


        /* If no database is specified, verify all. */
        List<String> dbNameList = null;
        List<String> internalDbs = null;
        DbTree dbMapTree = envImpl.getDbTree();


        if (dbName == null) {
            dbNameList = env.getDatabaseNames();


            dbNameList.addAll(dbMapTree.getInternalNoRepDbNames());
            if (envImpl.isReplicated()) {
                dbNameList.addAll(dbMapTree.getInternalRepDbNames());
            }
            internalDbs = dbMapTree.getInternalNoLookupDbNames();
        } else {
            dbNameList = new ArrayList<String>();

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Examples of com.sleepycat.je.dbi.EnvironmentImpl

                } else {
                    printUsageAndExit("Unknown argument: " + nextArg);
                }
            }


            final EnvironmentImpl envImpl =
                CmdUtil.makeUtilityEnvironment(envHome, true /*readOnly*/);
            final DbVerifyLog verifier = new DbVerifyLog(envImpl, 0);
            verifier.verify(startFile, endFile);
            System.exit(0);
        } catch (Throwable e) {

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Examples of com.sleepycat.je.dbi.EnvironmentImpl

            if (state != ReplicatedEnvironment.State.DETACHED) {
                throw EnvironmentFailureException.unexpectedState
                    ("joinState=" + state);
            }


            EnvironmentImpl envImpl =
                DbInternal.getEnvironmentImpl(rep);
            VLSNIndex vlsnIndex =
                RepInternal.getRepImpl(rep).getVLSNIndex();
            if (forward) {
                startLsn = DbLsn.NULL_LSN;
            } else {
                startLsn = envImpl.getFileManager().getLastUsedLsn();
            }


            int readBufferSize =
                envImpl.getConfigManager().getInt
                (EnvironmentParams.LOG_ITERATOR_READ_SIZE);
            FeederReader feederReader = null;
            FeederSyncupReader backwardsReader = null;


            VLSN scanVLSN = startVLSN;

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Examples of com.sleepycat.je.dbi.EnvironmentImpl

            rootLatch.release();
        }


        if (subtreeRootIN != null) {


            EnvironmentImpl envImpl = database.getDbEnvironment();
            if (rootNeedsUpdating) {


                /*
                 * modifyDbRoot will grab locks and we can't have the INList
                 * latches or root latch held while it tries to acquire locks.
                 */
                DbTree dbTree = envImpl.getDbTree();
                dbTree.optionalModifyDbRoot(database);
                RecoveryManager.traceRootDeletion
                    (envImpl.getLogger(), database);
            }


            /*
             * Count obsolete nodes after logging the delete. We can do
             * this without having the nodes of the subtree latched because the
             * subtree has been detached from the tree.
             */
            INList inList = envImpl.getInMemoryINs();
            accountForSubtreeRemoval(inList, subtreeRootIN, localTracker);
        }
    }

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Examples of com.sleepycat.je.dbi.EnvironmentImpl

    private boolean cascadeUpdates(ArrayList<SplitInfo> nodeLadder, int index)
        throws DatabaseException {


        ListIterator<SplitInfo> iter =
            nodeLadder.listIterator(nodeLadder.size());
        EnvironmentImpl envImpl = database.getDbEnvironment();
        LogManager logManager = envImpl.getLogManager();


        long newLsn = DbLsn.NULL_LSN;
        SplitInfo info = null;
        while (iter.hasPrevious()) {
            info = iter.previous();

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Examples of com.sleepycat.je.dbi.EnvironmentImpl


        /*
         * Create a new root IN, insert the current root IN into it, and then
         * call split.
         */
        EnvironmentImpl env = database.getDbEnvironment();
        LogManager logManager = env.getLogManager();
        INList inMemoryINs = env.getInMemoryINs();


        IN curRoot = null;
        curRoot = (IN) root.fetchTarget(database, null);
        curRoot.latch(cacheMode);
        long curRootLsn = 0;

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Examples of com.sleepycat.je.dbi.EnvironmentImpl

                             * DbTree.db lock, no problem.  The latest root
                             * will still get written out.
                             */
                            rootLatch.release();
                            rootLatched = false;
                            EnvironmentImpl env = database.getDbEnvironment();
                            env.getDbTree().optionalModifyDbRoot(database);
                            rootLatched = true;
                            rootLatch.acquireExclusive();
                            rootIN = (IN) root.fetchTarget(database, null);
                            rootIN.latch(cacheMode);
                        } else {

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Examples of com.sleepycat.je.dbi.EnvironmentImpl

                        rootLatchIsHeld = false;
                        continue;
                    }


                    final CacheMode cacheMode = cursor.getCacheMode();
                    final EnvironmentImpl env = database.getDbEnvironment();
                    final LogManager logManager = env.getLogManager();
                    final INList inMemoryINs = env.getInMemoryINs();


                    /*
                     * This is an empty tree, either because it's brand new
                     * tree or because everything in it was deleted. Create an
                     * IN and a BIN.  We could latch the rootIN here, but

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Examples of EnvironmentImpl

Introduction

Purpose

Search order

Transaction, username and classloader

Examples of com.sleepycat.je.dbi.EnvironmentImpl

Examples of com.sleepycat.je.dbi.EnvironmentImpl

Examples of com.sleepycat.je.dbi.EnvironmentImpl

Examples of com.sleepycat.je.dbi.EnvironmentImpl

Examples of com.sleepycat.je.dbi.EnvironmentImpl

Examples of com.sleepycat.je.dbi.EnvironmentImpl

Examples of com.sleepycat.je.dbi.EnvironmentImpl

Examples of com.sleepycat.je.dbi.EnvironmentImpl

Examples of com.sleepycat.je.dbi.EnvironmentImpl

Examples of com.sleepycat.je.dbi.EnvironmentImpl