001/*
002 * (C) Copyright 2018 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 *     pierre
018 */
019package org.nuxeo.ecm.core.bulk.action.computation;
020
021import java.io.IOException;
022import java.nio.file.Files;
023import java.nio.file.Path;
024import java.util.Collections;
025import java.util.List;
026
027import org.apache.logging.log4j.LogManager;
028import org.apache.logging.log4j.Logger;
029import org.nuxeo.ecm.core.api.Blob;
030import org.nuxeo.ecm.core.transientstore.api.TransientStore;
031import org.nuxeo.ecm.core.transientstore.api.TransientStoreService;
032import org.nuxeo.lib.stream.computation.AbstractComputation;
033import org.nuxeo.lib.stream.computation.ComputationContext;
034import org.nuxeo.runtime.api.Framework;
035
036/**
037 * @since 10.3
038 */
039public abstract class AbstractTransientBlobComputation extends AbstractComputation {
040
041    private static final Logger log = LogManager.getLogger(AbstractTransientBlobComputation.class);
042
043    private Path temp;
044
045    @Override
046    public void init(ComputationContext context) {
047        super.init(context);
048        try {
049            temp = Files.createTempDirectory(metadata().name());
050        } catch (IOException e) {
051            throw new IllegalStateException("Cannot create temp directory for " + this);
052        }
053    }
054
055    public AbstractTransientBlobComputation(String name) {
056        super(name, 1, 1);
057    }
058
059    public AbstractTransientBlobComputation(String name, int nbOutputStreams) {
060        super(name, 1, nbOutputStreams);
061    }
062
063
064    protected String getTransientStoreKey(String commandId) {
065        return metadata.name() + commandId;
066    }
067
068    public Blob getBlob(String key, String storeName) {
069        TransientStore store = Framework.getService(TransientStoreService.class).getStore(storeName);
070        List<Blob> blobs = store.getBlobs(key);
071        Blob blob = blobs == null || blobs.isEmpty() ? null : blobs.get(0);
072        if (blob == null) {
073            log.error("[{}] Could not retrieve blob for key {}", metadata.name(), key);
074        }
075        return blob;
076    }
077
078    protected void storeBlob(Blob blob, String commandId, String storeName) {
079        TransientStore store = Framework.getService(TransientStoreService.class).getStore(storeName);
080        store.putBlobs(getTransientStoreKey(commandId), Collections.singletonList(blob));
081        store.setCompleted(getTransientStoreKey(commandId), true);
082    }
083
084    protected Path createTemp(String commandId) {
085        return temp.resolve(commandId + ".csv");
086    }
087}