Examples with DatabaseContext org.neo4j.dbms.database.DatabaseContext used on opensource projects

Example 1 with DatabaseContext

use of org.neo4j.dbms.database.DatabaseContext in project neo4j by neo4j.

the class DatabaseAvailabilityIT method restartedDatabaseIsAvailable.

@Test
void restartedDatabaseIsAvailable() {
    DependencyResolver dependencyResolver = database.getDependencyResolver();
    DatabaseManager<?> databaseManager = getDatabaseManager(dependencyResolver);
    DatabaseContext databaseContext = databaseManager.getDatabaseContext(defaultNamedDatabaseId).get();
    Database database = databaseContext.database();
    executeTransactionOnDefaultDatabase();
    database.stop();
    assertThrows(DatabaseShutdownException.class, () -> this.database.beginTx());
    database.start();
    executeTransactionOnDefaultDatabase();
}

Example 2 with DatabaseContext

use of org.neo4j.dbms.database.DatabaseContext in project neo4j by neo4j.

the class DatabaseAvailabilityIT method stoppedDatabaseIsNotAvailable.

@Test
void stoppedDatabaseIsNotAvailable() {
    DependencyResolver dependencyResolver = database.getDependencyResolver();
    DatabaseManager<?> databaseManager = getDatabaseManager(dependencyResolver);
    DatabaseContext databaseContext = databaseManager.getDatabaseContext(defaultNamedDatabaseId).get();
    databaseContext.database().stop();
    assertThrows(DatabaseShutdownException.class, () -> database.beginTx());
}

Example 3 with DatabaseContext

use of org.neo4j.dbms.database.DatabaseContext in project neo4j by neo4j.

the class DatabaseAvailabilityIT method anyOfDatabaseUnavailabilityIsGlobalUnavailability.

@Test
void anyOfDatabaseUnavailabilityIsGlobalUnavailability() {
    AvailabilityRequirement outerSpaceRequirement = () -> "outer space";
    DependencyResolver dependencyResolver = database.getDependencyResolver();
    DatabaseManager<?> databaseManager = getDatabaseManager(dependencyResolver);
    CompositeDatabaseAvailabilityGuard compositeGuard = dependencyResolver.resolveDependency(CompositeDatabaseAvailabilityGuard.class);
    assertTrue(compositeGuard.isAvailable());
    DatabaseContext systemContext = databaseManager.getDatabaseContext(NAMED_SYSTEM_DATABASE_ID).get();
    DatabaseContext defaultContext = databaseManager.getDatabaseContext(defaultNamedDatabaseId).get();
    AvailabilityGuard systemGuard = systemContext.dependencies().resolveDependency(DatabaseAvailabilityGuard.class);
    systemGuard.require(outerSpaceRequirement);
    assertFalse(compositeGuard.isAvailable());
    systemGuard.fulfill(outerSpaceRequirement);
    assertTrue(compositeGuard.isAvailable());
    AvailabilityGuard defaultGuard = defaultContext.dependencies().resolveDependency(DatabaseAvailabilityGuard.class);
    defaultGuard.require(outerSpaceRequirement);
    assertFalse(compositeGuard.isAvailable());
    defaultGuard.fulfill(outerSpaceRequirement);
    assertTrue(compositeGuard.isAvailable());
}

Example 4 with DatabaseContext

use of org.neo4j.dbms.database.DatabaseContext in project neo4j by neo4j.

the class BuiltInDbmsProcedures method listTransactions.

@SystemProcedure
@Description("List all transactions currently executing at this instance that are visible to the user.")
@Procedure(name = "dbms.listTransactions", mode = DBMS)
public Stream<TransactionStatusResult> listTransactions() throws InvalidArgumentsException {
    ZoneId zoneId = getConfiguredTimeZone();
    List<TransactionStatusResult> result = new ArrayList<>();
    for (DatabaseContext databaseContext : getDatabaseManager().registeredDatabases().values()) {
        if (databaseContext.database().isStarted()) {
            DatabaseScope dbScope = new DatabaseScope(databaseContext.database().getNamedDatabaseId().name());
            Map<KernelTransactionHandle, Optional<QuerySnapshot>> handleQuerySnapshotsMap = new HashMap<>();
            for (KernelTransactionHandle tx : getExecutingTransactions(databaseContext)) {
                String username = tx.subject().username();
                var action = new AdminActionOnResource(SHOW_TRANSACTION, dbScope, new UserSegment(username));
                if (isSelfOrAllows(username, action)) {
                    handleQuerySnapshotsMap.put(tx, tx.executingQuery().map(ExecutingQuery::snapshot));
                }
            }
            TransactionDependenciesResolver transactionBlockerResolvers = new TransactionDependenciesResolver(handleQuerySnapshotsMap);
            for (KernelTransactionHandle tx : handleQuerySnapshotsMap.keySet()) {
                result.add(new TransactionStatusResult(databaseContext.databaseFacade().databaseName(), tx, transactionBlockerResolvers, handleQuerySnapshotsMap, zoneId));
            }
        }
    }
    return result.stream();
}

Example 5 with DatabaseContext

use of org.neo4j.dbms.database.DatabaseContext in project neo4j by neo4j.

the class BuiltInDbmsProcedures method listQueries.

@SystemProcedure
@Description("List all queries currently executing at this instance that are visible to the user.")
@Procedure(name = "dbms.listQueries", mode = DBMS)
public Stream<QueryStatusResult> listQueries() throws InvalidArgumentsException {
    ZoneId zoneId = getConfiguredTimeZone();
    List<QueryStatusResult> result = new ArrayList<>();
    for (FabricTransaction tx : getFabricTransactions()) {
        for (ExecutingQuery query : getActiveFabricQueries(tx)) {
            String username = query.username();
            var action = new AdminActionOnResource(SHOW_TRANSACTION, ALL, new UserSegment(username));
            if (isSelfOrAllows(username, action)) {
                result.add(new QueryStatusResult(query, (InternalTransaction) transaction, zoneId, "none"));
            }
        }
    }
    for (DatabaseContext databaseContext : getDatabaseManager().registeredDatabases().values()) {
        if (databaseContext.database().isStarted()) {
            DatabaseScope dbScope = new DatabaseScope(databaseContext.database().getNamedDatabaseId().name());
            for (KernelTransactionHandle tx : getExecutingTransactions(databaseContext)) {
                if (tx.executingQuery().isPresent()) {
                    ExecutingQuery query = tx.executingQuery().get();
                    // Include both the executing query and any previous queries (parent queries of nested query) in the result.
                    while (query != null) {
                        String username = query.username();
                        var action = new AdminActionOnResource(SHOW_TRANSACTION, dbScope, new UserSegment(username));
                        if (isSelfOrAllows(username, action)) {
                            result.add(new QueryStatusResult(query, (InternalTransaction) transaction, zoneId, databaseContext.databaseFacade().databaseName()));
                        }
                        query = query.getPreviousQuery();
                    }
                }
            }
        }
    }
    return result.stream();
}