001/* 002 * (C) Copyright 2006-2012 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * Florent Guillaume, jcarsique 018 */ 019 020package org.nuxeo.ecm.core.blob.binary; 021 022import java.io.File; 023import java.io.IOException; 024import java.io.InputStream; 025 026import org.apache.commons.io.output.NullOutputStream; 027import org.nuxeo.ecm.core.api.Blob; 028import org.nuxeo.ecm.core.api.impl.blob.FileBlob; 029 030/** 031 * A simple filesystem-based binary manager. It stores the binaries according to their digest (hash), which means that 032 * no transactional behavior needs to be implemented. 033 * <p> 034 * A garbage collection is needed to purge unused binaries. 035 * <p> 036 * The format of the <em>binaries</em> directory is: 037 * <ul> 038 * <li><em>data/</em> hierarchy with the actual binaries in subdirectories,</li> 039 * <li><em>tmp/</em> temporary storage during creation,</li> 040 * <li><em>config.xml</em> a file containing the configuration used.</li> 041 * </ul> 042 * 043 * @author Florent Guillaume 044 */ 045public class DefaultBinaryManager extends LocalBinaryManager { 046 047 @Override 048 public Binary getBinary(Blob blob) throws IOException { 049 if (!(blob instanceof FileBlob) || !((FileBlob) blob).isTemporary()) { 050 return super.getBinary(blob); // just open the stream 051 } 052 String digest = storeAndDigest((FileBlob) blob); 053 File file = getFileForDigest(digest, false); 054 /* 055 * Now we can build the Binary. 056 */ 057 return new Binary(file, digest, blobProviderId); 058 } 059 060 /** 061 * Stores and digests a temporary FileBlob. 062 */ 063 protected String storeAndDigest(FileBlob blob) throws IOException { 064 String digest; 065 try (InputStream in = blob.getStream()) { 066 digest = storeAndDigest(in, NullOutputStream.NULL_OUTPUT_STREAM); 067 } 068 File digestFile = getFileForDigest(digest, true); 069 if (digestFile.exists()) { 070 // The file with the proper digest is already there so don't do anything. This is to avoid 071 // "Stale NFS File Handle" problems which would occur if we tried to overwrite it anyway. 072 // Note that this doesn't try to protect from the case where two identical files are uploaded 073 // at the same time. 074 // Update date for the GC. 075 digestFile.setLastModified(blob.getFile().lastModified()); 076 } else { 077 blob.moveTo(digestFile); 078 } 079 return digest; 080 } 081 082}