org.guzz.service.core.impl.SlowUpdateServiceImpl.java Source code

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Here is the source code for org.guzz.service.core.impl.SlowUpdateServiceImpl.java

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/*
 * Copyright 2008-2009 the original author or authors.
 *
 * 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.guzz.service.core.impl;

import java.io.Serializable;
import java.sql.SQLException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.guzz.Guzz;
import org.guzz.GuzzContext;
import org.guzz.exception.GuzzException;
import org.guzz.exception.ORMException;
import org.guzz.jdbc.ObjectBatcher;
import org.guzz.orm.mapping.ObjectMappingManager;
import org.guzz.orm.mapping.POJOBasedObjectMapping;
import org.guzz.service.AbstractService;
import org.guzz.service.ServiceConfig;
import org.guzz.service.core.SlowUpdateService;
import org.guzz.transaction.TransactionManager;
import org.guzz.transaction.WriteTranSession;
import org.guzz.util.StringUtil;
import org.guzz.util.thread.DemonQueuedThread;
import org.guzz.web.context.GuzzContextAware;

/**
 * 
 * 
 *
 * @author liukaixuan(liukaixuan@gmail.com)
 */
public class SlowUpdateServiceImpl extends AbstractService implements GuzzContextAware, SlowUpdateService {
    private static transient final Log log = LogFactory.getLog(SlowUpdateServiceImpl.class);

    public static final String QUEUE_MAX_SIZE = "queueSize";

    private TransactionManager tm;

    private ObjectMappingManager omm;

    protected UpdateToDBThread updateThread;

    private int batchSize = 2048;
    private int queueSize = 20480;

    public void updateCount(String businessName, Object tableCondition, String propToUpdate, Serializable pkValue,
            int countToInc) {
        tableCondition = tableCondition == null ? Guzz.getTableCondition() : tableCondition;

        POJOBasedObjectMapping mapping = (POJOBasedObjectMapping) omm.getObjectMapping(businessName,
                tableCondition);

        if (mapping == null) {
            throw new ORMException("unknown business:[" + businessName + "]");
        }

        String columnToUpdate = mapping.getColNameByPropNameForSQL(propToUpdate);

        if (columnToUpdate == null) {
            throw new ORMException("unknown property:[" + propToUpdate + "], business name:[" + businessName + "]");
        }

        updateCount(mapping.getDbGroup().getPhysicsGroupName(tableCondition),
                mapping.getTable().getTableName(tableCondition), columnToUpdate,
                mapping.getTable().getPKColumn().getColNameForSQL(), pkValue, countToInc);
    }

    public void updateCount(Class domainClass, Object tableCondtion, String propToUpdate, Serializable pkValue,
            int countToInc) {
        updateCount(domainClass.getName(), tableCondtion, propToUpdate, pkValue, countToInc);
    }

    public void updateCount(String dbGroup, String tableName, String columnToUpdate, String pkColName,
            Serializable pkValue, int countToInc) {
        if (!isAvailable()) {
            throw new GuzzException(
                    "slowUpdateService is not available. use the config server's [slowUpdate] to active this service.");
        }

        IncUpdateBusiness ut = new IncUpdateBusiness(dbGroup);

        ut.setTableName(tableName);
        ut.setPkColunName(pkColName);

        ut.setColumnToUpdate(columnToUpdate);
        ut.setPkValue(pkValue.toString());
        ut.setCountToInc(countToInc);

        this.updateThread.addToQueue(ut);

        if (this.updateThread.isSleeping()) {
            synchronized (updateThread) {
                try {
                    this.updateThread.notify();
                } catch (Exception e) {
                }
            }
        }
    }

    public boolean configure(ServiceConfig[] scs) {
        if (scs == null || scs.length == 0) {
            //TODO: ?delegate????

            //???
            return false;
        }

        ServiceConfig sc = scs[0];

        String m_queueSize = (String) sc.getProps().get(QUEUE_MAX_SIZE);
        String m_batchSize = (String) sc.getProps().get("batchSize");

        this.queueSize = StringUtil.toInt(m_queueSize, this.queueSize);
        this.batchSize = StringUtil.toInt(m_batchSize, this.batchSize);

        return true;
    }

    public void startup() {
        //?
        if (updateThread == null) {
            updateThread = new UpdateToDBThread(this.queueSize);
            updateThread.start();
        }
    }

    public void shutdown() {
        if (updateThread != null) {
            updateThread.shutdown();
            updateThread = null;
        }
    }

    public boolean isAvailable() {
        return this.tm != null && updateThread != null;
    }

    class UpdateToDBThread extends DemonQueuedThread {

        public UpdateToDBThread(int queueSize) {
            super("slowUpdateThread", queueSize);
        }

        protected boolean doWithTheQueue() throws SQLException {
            if (queues == null) {
                return false;
            }

            int length = queues.length;
            boolean processSomething = false;

            WriteTranSession tran = null;
            IncUpdateBusiness ut = null;

            try {
                ObjectBatcher batcher = null;
                int addedCount = 0;

                for (int i = 0; i < length; i++) {
                    ut = (IncUpdateBusiness) queues[i];
                    if (ut == null)
                        continue;
                    queues[i] = null; //

                    processSomething = true;

                    if (tran == null) {
                        tran = tm.openRWTran(false);
                    }
                    if (batcher == null) {
                        batcher = tran.createObjectBatcher();
                    }

                    batcher.insert(ut);
                    addedCount++;

                    if (addedCount >= batchSize) {
                        batcher.executeBatch();
                        tran.commit();

                        addedCount = 0;
                    }
                }

                if (addedCount > 0) {
                    batcher.executeBatch();
                    tran.commit();
                }
            } catch (Exception e) {
                log.error(ut, e);

                if (tran != null) {
                    tran.rollback();
                }
            } finally {
                if (tran != null) {
                    tran.close();
                }
            }

            return processSomething;
        }

    }

    public void setGuzzContext(GuzzContext guzzContext) {
        this.tm = guzzContext.getTransactionManager();
        this.omm = guzzContext.getObjectMappingManager();
    }
}