org.paxml.tag.AbstractPaxmlEntity.java Source code

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Here is the source code for org.paxml.tag.AbstractPaxmlEntity.java

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/**
 * This file is part of PaxmlCore.
 *
 * PaxmlCore is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PaxmlCore is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with PaxmlCore.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.paxml.tag;

import java.io.File;
import java.io.IOException;
import java.util.List;

import org.paxml.core.Context;
import org.paxml.core.IEntity;
import org.paxml.core.IEntityExecutionListener;
import org.paxml.core.InMemoryResource;
import org.paxml.core.PaxmlResource;
import org.springframework.core.io.Resource;

/**
 * The base impl for paxml entity tags.
 * 
 * @author Xuetao Niu
 * 
 */
public abstract class AbstractPaxmlEntity extends AbstractTag implements IEntity {
    private long timestamp;

    /**
     * {@inheritDoc}
     * 
     */
    @Override
    public Object execute(Context context) {
        final List<IEntityExecutionListener> listeners = context.getEntityExecutionListeners(false);
        try {

            if (listeners != null) {
                for (IEntityExecutionListener listener : listeners) {
                    listener.onEntry(this, context);
                }
            }
            Object result = super.execute(context);

            return result;

        } finally {
            try {
                if (listeners != null) {
                    for (IEntityExecutionListener listener : listeners) {
                        listener.onExit(this, context);
                    }
                }
            } finally {
                context.closeAllCloseables();
            }
        }
    }

    @Override
    public boolean isCachable() {
        PaxmlResource res = getResource();
        return res != null && !(getResource() instanceof InMemoryResource);
    }

    @Override
    public boolean isModified() {
        Resource res = getResource().getSpringResource();
        if (!res.exists()) {
            return true;
        }
        final File file;
        try {
            file = res.getFile();

        } catch (IOException e) {
            // if file is not obtainable, it is not modifiable.
            return false;
        }
        return !file.exists() || file.lastModified() != timestamp;
    }

    public long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(long timestamp) {
        this.timestamp = timestamp;
    }

}