org.pentaho.di.www.cache.CarteStatusCache.java Source code

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Here is the source code for org.pentaho.di.www.cache.CarteStatusCache.java

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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2019 by Hitachi Vantara : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * Licensed 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.pentaho.di.www.cache;

import com.google.common.annotations.VisibleForTesting;
import org.apache.commons.io.FileUtils;
import org.hibernate.cache.CacheException;
import org.pentaho.di.core.Const;
import org.hibernate.cache.Cache;

import java.io.File;
import java.nio.file.Files;
import java.time.LocalDate;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;

public class CarteStatusCache implements Cache {

    public static final String CARTE_STATUS_CACHE = "CARTE_CACHE";

    /**
     * Switching the thread launched to be daemon otherwise it blocks the pentaho server shutdown
     */
    private final ScheduledExecutorService removeService = Executors
            .newSingleThreadScheduledExecutor(new ThreadFactory() {
                public Thread newThread(Runnable r) {
                    Thread t = Executors.defaultThreadFactory().newThread(r);
                    t.setDaemon(true);
                    t.setName(CarteStatusCache.class.getSimpleName());
                    return t;
                }
            });

    private final Map<String, CachedItem> cachedMap = new ConcurrentHashMap<>();

    private static final CarteStatusCache instance = new CarteStatusCache();

    private int period = 0;

    private TimeUnit timeUnit = null;

    public static CarteStatusCache getInstance() {
        return instance;
    }

    private CarteStatusCache() {
        period = Integer.parseInt(Const.getEnvironmentVariable("CARTE_CLEAR_PERIOD", "1"));
        timeUnit = TimeUnit.valueOf(Const.getEnvironmentVariable("CARTE_CLEAR_TIMEUNIT", "DAYS"));

        removeService.scheduleAtFixedRate(this::clear, 1, 1, TimeUnit.DAYS);
    }

    public void put(String logId, String cacheString, int from) {
        String randomPref = UUID.randomUUID().toString();
        File file = null;
        try {
            file = File.createTempFile(randomPref, null);
            file.deleteOnExit();
            Files.write(file.toPath(), cacheString.getBytes(Const.XML_ENCODING));
            CachedItem item = new CachedItem(file, from);
            if ((item = cachedMap.put(logId, item)) != null) {
                removeTask(item.getFile());
            }
        } catch (Exception e) {
            cachedMap.remove(logId);
            if (file != null) {
                file.delete();
            }
        }
    }

    public byte[] get(String logId, int from) {
        CachedItem item = null;
        try {
            item = cachedMap.get(logId);
            if (item == null || item.getFrom() != from) {
                return null;
            }

            synchronized (item.getFile()) {
                return Files.readAllBytes(item.getFile().toPath());
            }

        } catch (Exception e) {
            cachedMap.remove(logId);
            if (item != null) {
                removeTask(item.getFile());
            }
        }
        return null;
    }

    public void remove(String id) {
        CachedItem item = cachedMap.remove(id);
        if (item != null) {
            removeTask(item.getFile());
        }
    }

    private void removeTask(File file) {
        removeService.execute(() -> removeFile(file));
    }

    private void removeFile(File file) {
        synchronized (file) {
            if (file.exists()) {
                FileUtils.deleteQuietly(file);
            }
        }
    }

    @VisibleForTesting
    Map<String, CachedItem> getMap() {
        return cachedMap;
    }

    @Override
    public Object read(Object key) throws CacheException {
        return cachedMap.get(key);
    }

    @Override
    public Object get(Object key) throws CacheException {
        return cachedMap.get(key);
    }

    @Override
    public void put(Object key, Object value) throws CacheException {
        cachedMap.put((String) key, (CachedItem) value);
    }

    @Override
    public void update(Object key, Object value) throws CacheException {
        put((String) key, (CachedItem) value);
    }

    @Override
    public void remove(Object key) throws CacheException {
        remove((String) key);
    }

    @Override
    public void clear() throws CacheException {
        cachedMap.forEach((k, v) -> {
            if (LocalDate.now().isAfter(v.getExceedTime())) {
                remove(k);
            }
        });
    }

    @Override
    public void destroy() throws CacheException {
        clear();
    }

    @Override
    public Map toMap() {
        return cachedMap;
    }

    @Override
    public void lock(Object key) throws CacheException {
    }

    @Override
    public void unlock(Object key) throws CacheException {
    }

    @Override
    public long nextTimestamp() {
        return 0;
    }

    @Override
    public int getTimeout() {
        return 0;
    }

    @Override
    public String getRegionName() {
        return null;
    }

    @Override
    public long getSizeInMemory() {
        return 0;
    }

    @Override
    public long getElementCountInMemory() {
        return 0;
    }

    @Override
    public long getElementCountOnDisk() {
        return 0;
    }
}