org.usergrid.mongo.protocol.OpDelete Maven / Gradle / Ivy

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Mongo emulation layer for Usergrid system.
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/*******************************************************************************
 * Copyright 2012 Apigee Corporation
 * 
 * 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.usergrid.mongo.protocol;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Map;
import java.util.UUID;

import org.bson.BSONObject;
import org.bson.BasicBSONObject;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBufferInputStream;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.MessageEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.usergrid.management.ApplicationInfo;
import org.usergrid.mongo.MongoChannelHandler;
import org.usergrid.mongo.query.MongoQueryParser;
import org.usergrid.mongo.utils.BSONUtils;
import org.usergrid.persistence.EntityManager;
import org.usergrid.persistence.Identifier;
import org.usergrid.persistence.Query;
import org.usergrid.persistence.Results;
import org.usergrid.persistence.Results.Level;
import org.usergrid.persistence.SimpleEntityRef;
import org.usergrid.security.shiro.utils.SubjectUtils;

public class OpDelete extends OpCrud {

    private static final Logger logger = LoggerFactory
            .getLogger(OpDelete.class);
    public static final int BATCH_SIZE = 1000;

    private int flags;
    // delete query
    private BSONObject selector;

    public OpDelete() {
        opCode = OP_DELETE;
    }

    public int getFlags() {
        return flags;
    }

    public void setFlags(int flags) {
        this.flags = flags;
    }

    public BSONObject getSelector() {
        return selector;
    }

    public void setSelector(BSONObject selector) {
        this.selector = selector;
    }

    public void setSelector(Map map) {
        selector = new BasicBSONObject();
        selector.putAll(map);
    }

    @Override
    public void decode(ChannelBuffer buffer) throws IOException {
        super.decode(buffer);
        buffer.readInt();
        fullCollectionName = readCString(buffer);
        flags = buffer.readInt();
        selector = BSONUtils.decoder().readObject(
                new ChannelBufferInputStream(buffer));
    }

    @Override
    public ChannelBuffer encode(ChannelBuffer buffer) {
        int l = 24; // 6 ints * 4 bytes

        ByteBuffer fullCollectionNameBytes = getCString(fullCollectionName);
        l += fullCollectionNameBytes.capacity();

        ByteBuffer selectorBytes = encodeDocument(selector);
        l += selectorBytes.capacity();

        messageLength = l;

        buffer = super.encode(buffer);

        buffer.writeInt(0);

        buffer.writeBytes(fullCollectionNameBytes);

        buffer.writeInt(flags);

        buffer.writeBytes(selectorBytes);

        return buffer;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.usergrid.mongo.protocol.OpCrud#doOp(org.usergrid.mongo.
     * MongoChannelHandler, org.jboss.netty.channel.ChannelHandlerContext,
     * org.jboss.netty.channel.MessageEvent)
     */
    @Override
    public OpReply doOp(MongoChannelHandler handler, ChannelHandlerContext ctx,
            MessageEvent messageEvent) {

        // perform the query
        Query query = MongoQueryParser.toNativeQuery(selector, 0);

        // TODO TN set an error
        if (query == null) {
            return null;
        }

        query.setResultsLevel(Level.IDS);
        query.setLimit(BATCH_SIZE);

        ApplicationInfo application = SubjectUtils.getApplication(Identifier
                .from(getDatabaseName()));

        if (application == null) {
            ctx.setAttachment(new IllegalArgumentException(String.format("Could not find application with name '%s' ", getDatabaseName())));
            return null;
        }

        // delete every result

        EntityManager em = handler.getEmf().getEntityManager(
                application.getId());

        Results results = null;

        do {

            try {
                
                if(results != null){
                    query.setCursor(results.getCursor());
                }

                results = em.searchCollection(em.getApplicationRef(),
                        getCollectionName(), query);

                // now loop through all the ids and delete them
                for (UUID id : results.getIds()) {
                    em.delete(new SimpleEntityRef(query.getEntityType(), id));
                }

            } catch (Exception ex) {
                logger.error("Unable to delete object", ex);
                ctx.setAttachment(ex);
            }

        } while (results.getCursor() != null);

        // return nothing on delete, like insert
        
        return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return "OpDelete [flags=" + flags + ", selector=" + selector
                + ", fullCollectionName=" + fullCollectionName
                + ", messageLength=" + messageLength + ", requestID="
                + requestID + ", responseTo=" + responseTo + ", opCode="
                + opCode + "]";
    }
}