| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.nifi.controller.queue.clustered; |
| |
| import org.apache.nifi.controller.repository.ContentNotFoundException; |
| import org.apache.nifi.controller.repository.ContentRepository; |
| import org.apache.nifi.controller.repository.FlowFileRecord; |
| import org.apache.nifi.controller.repository.io.LimitedInputStream; |
| import org.apache.nifi.stream.io.StreamUtils; |
| |
| import java.io.EOFException; |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| public class ContentRepositoryFlowFileAccess implements FlowFileContentAccess { |
| private final ContentRepository contentRepository; |
| |
| public ContentRepositoryFlowFileAccess(final ContentRepository contentRepository) { |
| this.contentRepository = contentRepository; |
| } |
| |
| @Override |
| public InputStream read(final FlowFileRecord flowFile) throws IOException { |
| final InputStream rawIn; |
| try { |
| rawIn = contentRepository.read(flowFile.getContentClaim()); |
| } catch (final ContentNotFoundException cnfe) { |
| throw new ContentNotFoundException(flowFile, flowFile.getContentClaim(), cnfe.getMessage()); |
| } |
| |
| if (flowFile.getContentClaimOffset() > 0) { |
| try { |
| StreamUtils.skip(rawIn, flowFile.getContentClaimOffset()); |
| } catch (final EOFException eof) { |
| throw new ContentNotFoundException(flowFile, flowFile.getContentClaim(), "FlowFile has a Content Claim Offset of " |
| + flowFile.getContentClaimOffset() + " bytes but the Content Claim does not have that many bytes"); |
| } |
| } |
| |
| final InputStream limitedIn = new LimitedInputStream(rawIn, flowFile.getSize()); |
| // Wrap the Content Repository's InputStream with one that ensures that we are able to consume all of the FlowFile's content or else throws EOFException |
| return new FilterInputStream(limitedIn) { |
| private long bytesRead = 0; |
| |
| @Override |
| public int read(final byte[] b, final int off, final int len) throws IOException { |
| return ensureNotTruncated(limitedIn.read(b, off, len)); |
| } |
| |
| @Override |
| public int read(final byte[] b) throws IOException { |
| return ensureNotTruncated(limitedIn.read(b)); |
| } |
| |
| @Override |
| public int read() throws IOException { |
| return ensureNotTruncated(limitedIn.read()); |
| } |
| |
| private int ensureNotTruncated(final int length) throws EOFException { |
| if (length > -1) { |
| bytesRead += length; |
| return length; |
| } |
| |
| if (bytesRead < flowFile.getSize()) { |
| throw new EOFException("Expected " + flowFile + " to contain " + flowFile.getSize() + " bytes but the content repository only had " + bytesRead + " bytes for it"); |
| } |
| |
| return length; |
| } |
| }; |
| } |
| |
| } |