Examples with ExtensibleBufferedInputStream org.teiid.common.buffer.ExtensibleBufferedInputStream used on opensource projects

Example 1 with ExtensibleBufferedInputStream

use of org.teiid.common.buffer.ExtensibleBufferedInputStream in project teiid by teiid.

the class BufferFrontedFileStoreCache method get.

@Override
public CacheEntry get(PhysicalInfo info, Long oid, WeakReference<? extends Serializer<?>> ref) throws TeiidComponentException {
    if (info == null) {
        return null;
    }
    Serializer<?> serializer = ref.get();
    if (serializer == null) {
        return null;
    }
    readAttempts.incrementAndGet();
    InputStream is = null;
    Lock lock = null;
    ExtensibleBufferedInputStream eis = null;
    int memoryBlocks = 0;
    try {
        synchronized (info) {
            // load should be locked
            assert !info.pinned && info.loading;
            // not necessary, but should make things safer
            info.await(true, false);
            if (info.inode != EMPTY_ADDRESS) {
                info.pinned = true;
                memoryBufferEntries.touch(info);
                if (LogManager.isMessageToBeRecorded(LogConstants.CTX_BUFFER_MGR, MessageLevel.DETAIL)) {
                    // $NON-NLS-1$
                    LogManager.logDetail(LogConstants.CTX_BUFFER_MGR, "Getting object at inode", info.inode, serializer.getId(), oid);
                }
                BlockManager manager = getBlockManager(serializer.getId(), oid, info.inode);
                is = new BlockInputStream(manager, info.memoryBlockCount);
            } else if (info.block != EMPTY_ADDRESS) {
                info.pinned = true;
                memoryBufferEntries.recordAccess(info);
                storageReads.incrementAndGet();
                if (LogManager.isMessageToBeRecorded(LogConstants.CTX_BUFFER_MGR, MessageLevel.DETAIL)) {
                    // $NON-NLS-1$
                    LogManager.logDetail(LogConstants.CTX_BUFFER_MGR, "Getting object at block", info.block, info.sizeIndex, serializer.getId(), oid);
                }
                BlockStore blockStore = sizeBasedStores[info.sizeIndex];
                int segment = info.block / blockStore.blocksInUse.getBitsPerSegment();
                FileStore fs = blockStore.stores[segment];
                long blockOffset = (info.block % blockStore.blocksInUse.getBitsPerSegment()) * blockStore.blockSize;
                eis = fs.createInputStream(blockOffset, info.memoryBlockCount << LOG_BLOCK_SIZE);
                lock = blockStore.locks[segment].writeLock();
                memoryBlocks = info.memoryBlockCount;
            } else {
                return null;
            }
        }
        if (lock != null) {
            is = readIntoMemory(info, eis, lock, memoryBlocks);
        }
        for (int i = 0; i < HEADER_BYTES; i++) {
            is.read();
        }
        ObjectInput dis = new ObjectInputStream(is);
        CacheEntry ce = new CacheEntry(new CacheKey(oid, 1, 1), info.sizeEstimate, serializer.deserialize(dis), ref, true);
        return ce;
    } catch (IOException e) {
        throw new TeiidComponentException(QueryPlugin.Event.TEIID30048, e, QueryPlugin.Util.gs(QueryPlugin.Event.TEIID30048, info.gid, oid));
    } catch (ClassNotFoundException e) {
        throw new TeiidComponentException(QueryPlugin.Event.TEIID30048, e, QueryPlugin.Util.gs(QueryPlugin.Event.TEIID30048, info.gid, oid));
    } catch (InterruptedException e) {
        throw new TeiidRuntimeException(QueryPlugin.Event.TEIID30049, e);
    } finally {
        synchronized (info) {
            info.pinned = false;
            info.notifyAll();
        }
    }
}