Examples with FlowFileAccessOutputStream org.apache.nifi.controller.repository.io.FlowFileAccessOutputStream used on opensource projects

Example 1 with FlowFileAccessOutputStream

use of org.apache.nifi.controller.repository.io.FlowFileAccessOutputStream in project nifi by apache.

the class StandardProcessSession method write.

@Override
public FlowFile write(FlowFile source, final StreamCallback writer) {
    verifyTaskActive();
    source = validateRecordState(source);
    final StandardRepositoryRecord record = records.get(source);
    final ContentClaim currClaim = record.getCurrentClaim();
    long writtenToFlowFile = 0L;
    ContentClaim newClaim = null;
    try {
        newClaim = claimCache.getContentClaim();
        claimLog.debug("Creating ContentClaim {} for 'write' for {}", newClaim, source);
        ensureNotAppending(newClaim);
        if (currClaim != null) {
            claimCache.flush(currClaim.getResourceClaim());
        }
        try (final InputStream is = getInputStream(source, currClaim, record.getCurrentClaimOffset(), true);
            final InputStream limitedIn = new LimitedInputStream(is, source.getSize());
            final InputStream disableOnCloseIn = new DisableOnCloseInputStream(limitedIn);
            final ByteCountingInputStream countingIn = new ByteCountingInputStream(disableOnCloseIn, bytesRead);
            final OutputStream os = claimCache.write(newClaim);
            final OutputStream disableOnCloseOut = new DisableOnCloseOutputStream(os);
            final ByteCountingOutputStream countingOut = new ByteCountingOutputStream(disableOnCloseOut)) {
            writeRecursionSet.add(source);
            // We want to differentiate between IOExceptions thrown by the repository and IOExceptions thrown from
            // Processor code. As a result, as have the FlowFileAccessInputStream that catches IOException from the repository
            // and translates into either FlowFileAccessException or ContentNotFoundException. We keep track of any
            // ContentNotFoundException because if it is thrown, the Processor code may catch it and do something else with it
            // but in reality, if it is thrown, we want to know about it and handle it, even if the Processor code catches it.
            final FlowFileAccessInputStream ffais = new FlowFileAccessInputStream(countingIn, source, currClaim);
            final FlowFileAccessOutputStream ffaos = new FlowFileAccessOutputStream(countingOut, source);
            boolean cnfeThrown = false;
            try {
                writer.process(createTaskTerminationStream(ffais), createTaskTerminationStream(ffaos));
            } catch (final ContentNotFoundException cnfe) {
                cnfeThrown = true;
                throw cnfe;
            } finally {
                writtenToFlowFile = countingOut.getBytesWritten();
                this.bytesWritten += writtenToFlowFile;
                this.bytesRead += countingIn.getBytesRead();
                writeRecursionSet.remove(source);
                // if cnfeThrown is true, we don't need to re-thrown the Exception; it will propagate.
                if (!cnfeThrown && ffais.getContentNotFoundException() != null) {
                    throw ffais.getContentNotFoundException();
                }
            }
        }
    } catch (final ContentNotFoundException nfe) {
        destroyContent(newClaim);
        handleContentNotFound(nfe, record);
    } catch (final IOException ioe) {
        destroyContent(newClaim);
        throw new ProcessException("IOException thrown from " + connectableDescription + ": " + ioe.toString(), ioe);
    } catch (final FlowFileAccessException ffae) {
        destroyContent(newClaim);
        throw ffae;
    } catch (final Throwable t) {
        destroyContent(newClaim);
        throw t;
    }
    removeTemporaryClaim(record);
    final FlowFileRecord newFile = new StandardFlowFileRecord.Builder().fromFlowFile(record.getCurrent()).contentClaim(newClaim).contentClaimOffset(Math.max(0L, newClaim.getLength() - writtenToFlowFile)).size(writtenToFlowFile).build();
    record.setWorking(newFile);
    return newFile;
}

Example 2 with FlowFileAccessOutputStream

use of org.apache.nifi.controller.repository.io.FlowFileAccessOutputStream in project nifi by apache.

the class StandardProcessSession method append.

@Override
public FlowFile append(FlowFile source, final OutputStreamCallback writer) {
    verifyTaskActive();
    source = validateRecordState(source);
    final StandardRepositoryRecord record = records.get(source);
    long newSize = 0L;
    // Get the current Content Claim from the record and see if we already have
    // an OutputStream that we can append to.
    final ContentClaim oldClaim = record.getCurrentClaim();
    ByteCountingOutputStream outStream = oldClaim == null ? null : appendableStreams.get(oldClaim);
    long originalByteWrittenCount = 0;
    ContentClaim newClaim = null;
    try {
        if (outStream == null) {
            claimCache.flush(oldClaim);
            try (final InputStream oldClaimIn = context.getContentRepository().read(oldClaim)) {
                newClaim = context.getContentRepository().create(context.getConnectable().isLossTolerant());
                claimLog.debug("Creating ContentClaim {} for 'append' for {}", newClaim, source);
                final OutputStream rawOutStream = context.getContentRepository().write(newClaim);
                final OutputStream bufferedOutStream = new BufferedOutputStream(rawOutStream);
                outStream = new ByteCountingOutputStream(bufferedOutStream);
                originalByteWrittenCount = 0;
                appendableStreams.put(newClaim, outStream);
                // We need to copy all of the data from the old claim to the new claim
                StreamUtils.copy(oldClaimIn, outStream);
                // wrap our OutputStreams so that the processor cannot close it
                try (final OutputStream disableOnClose = new DisableOnCloseOutputStream(outStream)) {
                    writeRecursionSet.add(source);
                    writer.process(new FlowFileAccessOutputStream(disableOnClose, source));
                } finally {
                    writeRecursionSet.remove(source);
                }
            }
        } else {
            newClaim = oldClaim;
            originalByteWrittenCount = outStream.getBytesWritten();
            // wrap our OutputStreams so that the processor cannot close it
            try (final OutputStream disableOnClose = new DisableOnCloseOutputStream(outStream);
                final OutputStream flowFileAccessOutStream = new FlowFileAccessOutputStream(disableOnClose, source)) {
                writeRecursionSet.add(source);
                writer.process(flowFileAccessOutStream);
            } finally {
                writeRecursionSet.remove(source);
            }
        }
        // update the newSize to reflect the number of bytes written
        newSize = outStream.getBytesWritten();
    } catch (final ContentNotFoundException nfe) {
        // need to reset write claim before we can remove the claim
        resetWriteClaims();
        // it here also, we would be decrementing the claimant count twice!
        if (newClaim != oldClaim) {
            destroyContent(newClaim);
        }
        handleContentNotFound(nfe, record);
    } catch (final IOException ioe) {
        // need to reset write claim before we can remove the claim
        resetWriteClaims();
        // See above explanation for why this is done only if newClaim != oldClaim
        if (newClaim != oldClaim) {
            destroyContent(newClaim);
        }
        throw new ProcessException("IOException thrown from " + connectableDescription + ": " + ioe.toString(), ioe);
    } catch (final Throwable t) {
        // need to reset write claim before we can remove the claim
        resetWriteClaims();
        // See above explanation for why this is done only if newClaim != oldClaim
        if (newClaim != oldClaim) {
            destroyContent(newClaim);
        }
        throw t;
    } finally {
        if (outStream != null) {
            final long bytesWrittenThisIteration = outStream.getBytesWritten() - originalByteWrittenCount;
            bytesWritten += bytesWrittenThisIteration;
        }
    }
    // the FlowFile was written to, via #write() and then append() was called.
    if (newClaim != oldClaim) {
        removeTemporaryClaim(record);
    }
    final FlowFileRecord newFile = new StandardFlowFileRecord.Builder().fromFlowFile(record.getCurrent()).contentClaim(newClaim).contentClaimOffset(0).size(newSize).build();
    record.setWorking(newFile);
    return newFile;
}

Example 3 with FlowFileAccessOutputStream

use of org.apache.nifi.controller.repository.io.FlowFileAccessOutputStream in project nifi by apache.

the class StandardProcessSession method write.

@Override
public FlowFile write(FlowFile source, final OutputStreamCallback writer) {
    verifyTaskActive();
    source = validateRecordState(source);
    final StandardRepositoryRecord record = records.get(source);
    long writtenToFlowFile = 0L;
    ContentClaim newClaim = null;
    try {
        newClaim = claimCache.getContentClaim();
        claimLog.debug("Creating ContentClaim {} for 'write' for {}", newClaim, source);
        ensureNotAppending(newClaim);
        try (final OutputStream stream = claimCache.write(newClaim);
            final OutputStream disableOnClose = new DisableOnCloseOutputStream(stream);
            final ByteCountingOutputStream countingOut = new ByteCountingOutputStream(disableOnClose)) {
            try {
                writeRecursionSet.add(source);
                final OutputStream ffaos = new FlowFileAccessOutputStream(countingOut, source);
                writer.process(createTaskTerminationStream(ffaos));
            } finally {
                writtenToFlowFile = countingOut.getBytesWritten();
                bytesWritten += countingOut.getBytesWritten();
            }
        } finally {
            writeRecursionSet.remove(source);
        }
    } catch (final ContentNotFoundException nfe) {
        // need to reset write claim before we can remove the claim
        resetWriteClaims();
        destroyContent(newClaim);
        handleContentNotFound(nfe, record);
    } catch (final FlowFileAccessException ffae) {
        // need to reset write claim before we can remove the claim
        resetWriteClaims();
        destroyContent(newClaim);
        throw ffae;
    } catch (final IOException ioe) {
        // need to reset write claim before we can remove the claim
        resetWriteClaims();
        destroyContent(newClaim);
        throw new ProcessException("IOException thrown from " + connectableDescription + ": " + ioe.toString(), ioe);
    } catch (final Throwable t) {
        // need to reset write claim before we can remove the claim
        resetWriteClaims();
        destroyContent(newClaim);
        throw t;
    }
    removeTemporaryClaim(record);
    final FlowFileRecord newFile = new StandardFlowFileRecord.Builder().fromFlowFile(record.getCurrent()).contentClaim(newClaim).contentClaimOffset(Math.max(0, newClaim.getLength() - writtenToFlowFile)).size(writtenToFlowFile).build();
    record.setWorking(newFile);
    return newFile;
}