Examples with BackendException org.janusgraph.diskstorage.BackendException used on opensource projects

Example 11 with BackendException

use of org.janusgraph.diskstorage.BackendException in project janusgraph by JanusGraph.

the class BerkeleyJEKeyValueStore method getSlice.

@Override
public RecordIterator<KeyValueEntry> getSlice(KVQuery query, StoreTransaction txh) throws BackendException {
    log.trace("beginning db={}, op=getSlice, tx={}", name, txh);
    final Transaction tx = getTransaction(txh);
    final StaticBuffer keyStart = query.getStart();
    final StaticBuffer keyEnd = query.getEnd();
    final KeySelector selector = query.getKeySelector();
    final List<KeyValueEntry> result = new ArrayList<>();
    final DatabaseEntry foundKey = keyStart.as(ENTRY_FACTORY);
    final DatabaseEntry foundData = new DatabaseEntry();
    try (final Cursor cursor = db.openCursor(tx, null)) {
        OperationStatus status = cursor.getSearchKeyRange(foundKey, foundData, getLockMode(txh));
        // Iterate until given condition is satisfied or end of records
        while (status == OperationStatus.SUCCESS) {
            StaticBuffer key = getBuffer(foundKey);
            if (key.compareTo(keyEnd) >= 0)
                break;
            if (selector.include(key)) {
                result.add(new KeyValueEntry(key, getBuffer(foundData)));
            }
            if (selector.reachedLimit())
                break;
            status = cursor.getNext(foundKey, foundData, getLockMode(txh));
        }
    } catch (Exception e) {
        throw new PermanentBackendException(e);
    }
    log.trace("db={}, op=getSlice, tx={}, resultcount={}", name, txh, result.size());
    return new RecordIterator<KeyValueEntry>() {

        private final Iterator<KeyValueEntry> entries = result.iterator();

        @Override
        public boolean hasNext() {
            return entries.hasNext();
        }

        @Override
        public KeyValueEntry next() {
            return entries.next();
        }

        @Override
        public void close() {
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    };
}

Example 12 with BackendException

use of org.janusgraph.diskstorage.BackendException in project janusgraph by JanusGraph.

the class AstyanaxStoreManager method getRetryPolicy.

private static RetryPolicy getRetryPolicy(String serializedRetryPolicy) throws BackendException {
    String[] tokens = serializedRetryPolicy.split(",");
    String policyClassName = tokens[0];
    int argCount = tokens.length - 1;
    Integer[] args = new Integer[argCount];
    for (int i = 1; i < tokens.length; i++) {
        args[i - 1] = Integer.valueOf(tokens[i]);
    }
    try {
        RetryPolicy rp = instantiate(policyClassName, args, serializedRetryPolicy);
        log.debug("Instantiated RetryPolicy object {} from config string \"{}\"", rp, serializedRetryPolicy);
        return rp;
    } catch (Exception e) {
        throw new PermanentBackendException("Failed to instantiate Astyanax Retry Policy class", e);
    }
}

Example 13 with BackendException

use of org.janusgraph.diskstorage.BackendException in project janusgraph by JanusGraph.

the class CassandraThriftStoreManager method ensureColumnFamilyExists.

private void ensureColumnFamilyExists(String ksName, String cfName) throws BackendException {
    CTConnection conn = null;
    try {
        KsDef keyspaceDef = ensureKeyspaceExists(ksName);
        conn = pool.borrowObject(ksName);
        Cassandra.Client client = conn.getClient();
        log.debug("Looking up metadata on keyspace {}...", ksName);
        boolean foundColumnFamily = false;
        for (CfDef cfDef : keyspaceDef.getCf_defs()) {
            String curCfName = cfDef.getName();
            if (curCfName.equals(cfName))
                foundColumnFamily = true;
        }
        if (!foundColumnFamily) {
            createColumnFamily(client, ksName, cfName, "org.apache.cassandra.db.marshal.BytesType");
        } else {
            log.debug("Keyspace {} and ColumnFamily {} were found.", ksName, cfName);
        }
    } catch (SchemaDisagreementException e) {
        throw new TemporaryBackendException(e);
    } catch (Exception e) {
        throw new PermanentBackendException(e);
    } finally {
        pool.returnObjectUnsafe(ksName, conn);
    }
}

Example 14 with BackendException

use of org.janusgraph.diskstorage.BackendException in project janusgraph by JanusGraph.

the class CassandraThriftStoreManager method getCompressionOptions.

@Override
public Map<String, String> getCompressionOptions(String cf) throws BackendException {
    CTConnection conn = null;
    Map<String, String> result = null;
    try {
        conn = pool.borrowObject(keySpaceName);
        Cassandra.Client client = conn.getClient();
        KsDef ksDef = client.describe_keyspace(keySpaceName);
        for (CfDef cfDef : ksDef.getCf_defs()) {
            if (null != cfDef && cfDef.getName().equals(cf)) {
                result = cfDef.getCompression_options();
                break;
            }
        }
        return result;
    } catch (InvalidRequestException e) {
        log.debug("Keyspace {} does not exist", keySpaceName);
        return null;
    } catch (Exception e) {
        throw new TemporaryBackendException(e);
    } finally {
        pool.returnObjectUnsafe(keySpaceName, conn);
    }
}

Example 15 with BackendException

use of org.janusgraph.diskstorage.BackendException in project janusgraph by JanusGraph.

the class CassandraThriftStoreManager method getLocalKeyPartition.

@Override
public List<KeyRange> getLocalKeyPartition() throws BackendException {
    CTConnection conn = null;
    IPartitioner partitioner = getCassandraPartitioner();
    if (!(partitioner instanceof AbstractByteOrderedPartitioner))
        throw new UnsupportedOperationException("getLocalKeyPartition() only supported by byte ordered partitioner.");
    Token.TokenFactory tokenFactory = partitioner.getTokenFactory();
    try {
        // Resist the temptation to describe SYSTEM_KS.  It has no ring.
        // Instead, we'll create our own keyspace (or check that it exists), then describe it.
        ensureKeyspaceExists(keySpaceName);
        conn = pool.borrowObject(keySpaceName);
        final List<TokenRange> ranges = conn.getClient().describe_ring(keySpaceName);
        final List<KeyRange> keyRanges = new ArrayList<>(ranges.size());
        for (TokenRange range : ranges) {
            if (!NetworkUtil.hasLocalAddress(range.endpoints))
                continue;
            keyRanges.add(CassandraHelper.transformRange(tokenFactory.fromString(range.start_token), tokenFactory.fromString(range.end_token)));
        }
        return keyRanges;
    } catch (Exception e) {
        throw CassandraThriftKeyColumnValueStore.convertException(e);
    } finally {
        pool.returnObjectUnsafe(keySpaceName, conn);
    }
}