org.brushingbits.jnap.email.EmailSender.java Source code

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Here is the source code for org.brushingbits.jnap.email.EmailSender.java

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/*
 * EmailSender.java created on 2010-10-16
 *
 * Created by Brushing Bits Labs
 * http://www.brushingbits.org
 *
 * 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.brushingbits.jnap.email;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ScheduledFuture;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessagePreparator;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.stereotype.Component;
import org.springframework.util.Assert;

/**
 * @author Daniel Rochetti
 * @since 1.0
 */
@Component
public class EmailSender implements Runnable {

    private static Log logger = LogFactory.getLog(EmailSender.class);

    private static final int DEFAULT_NUM_RETRIES = 10;

    private JavaMailSenderImpl defaultMailSender;
    private Map<EmailAccountInfo, JavaMailSenderImpl> mailSenderMap;
    private List<Email> toSendList;
    private Map<Email, Integer> toRetryList;
    private ThreadPoolTaskScheduler taskScheduler;
    private ScheduledFuture scheduledAsyncSender;

    private EmailAccountInfo defaultEmailAccount;
    private int numberOfRetries = DEFAULT_NUM_RETRIES;
    private long asyncSendInterval = 30000;
    private int asyncThreadPoolSize = 4;

    public EmailSender() {
        this(null);
    }

    public EmailSender(EmailAccountInfo defaultEmailAccount) {
        this.toSendList = Collections.synchronizedList(new ArrayList<Email>());
        this.toRetryList = new HashMap<Email, Integer>();
        this.defaultEmailAccount = defaultEmailAccount;
        this.defaultMailSender = new JavaMailSenderImpl();
        this.mailSenderMap = Collections.synchronizedMap(new HashMap<EmailAccountInfo, JavaMailSenderImpl>());
    }

    @PostConstruct
    public void afterPropertiesSet() throws Exception {
        Assert.notNull(this.defaultEmailAccount, "You must provide a default email account configuration.");
        this.defaultMailSender.setJavaMailProperties(this.defaultEmailAccount.getJavaMailProperties());
        if (StringUtils.isNotBlank(this.defaultEmailAccount.getUsername())) {
            this.defaultMailSender.setUsername(this.defaultEmailAccount.getUsername());
            this.defaultMailSender.setPassword(this.defaultEmailAccount.getPassword());
        }
        this.taskScheduler = new ThreadPoolTaskScheduler();
        this.taskScheduler.setPoolSize(this.asyncThreadPoolSize);
        this.taskScheduler.initialize();
        this.scheduledAsyncSender = this.taskScheduler.scheduleWithFixedDelay(this, this.asyncSendInterval);
    }

    @PreDestroy
    public void destroy() throws Exception {
        this.scheduledAsyncSender.cancel(false);
        this.taskScheduler.destroy();
    }

    public void send(Email email) {
        EmailAccountInfo accountInfo = defaultEmailAccount;
        JavaMailSenderImpl sender = this.defaultMailSender;
        if (email.getAccountInfo() != null) {
            accountInfo = email.getAccountInfo();
            synchronized (this.mailSenderMap) {
                sender = this.mailSenderMap.get(accountInfo);
                if (sender == null) {
                    sender = new JavaMailSenderImpl();
                    Properties props = new Properties(this.defaultEmailAccount.getJavaMailProperties());
                    props.putAll(accountInfo.getJavaMailProperties());
                    sender.setJavaMailProperties(props);
                    sender.setUsername(accountInfo.getUsername());
                    sender.setPassword(accountInfo.getPassword());
                    this.mailSenderMap.put(accountInfo, sender);
                }
            }
        }
        sender.send((MimeMessagePreparator) email);
    }

    public void sendAsync(Email email) {
        synchronized (toSendList) {
            toSendList.add(email);
        }
    }

    /**
     * 
     */
    public void run() {
        List<Email> emails = new ArrayList<Email>();
        synchronized (toSendList) {
            if (toSendList.isEmpty()) {
                return;
            }
            emails.addAll(toSendList);
            toSendList.clear();
            emails.addAll(toRetryList.keySet());
        }
        if (logger.isDebugEnabled()) {
            logger.debug("Preparing to send " + emails.size() + " emails.");
        }
        for (Email email : emails) {
            try {
                this.send(email);
                toRetryList.remove(email);
            } catch (Exception e) {
                logger.error(e.getMessage(), e);
                Integer retries = toRetryList.get(email);
                retries = retries == null ? 0 : retries;
                if (retries < numberOfRetries) {
                    toRetryList.put(email, ++retries);
                } else {
                    logger.info("Email discarded. Couldn't send after " + numberOfRetries + " retries.");
                    toRetryList.remove(email);
                }
            }
        }
    }

    public int getNumberOfRetries() {
        return numberOfRetries;
    }

    public void setNumberOfRetries(int numberOfRetries) {
        this.numberOfRetries = numberOfRetries;
    }

    public long getAsyncSendInterval() {
        return asyncSendInterval;
    }

    public void setAsyncSendInterval(long asyncSendInterval) {
        this.asyncSendInterval = asyncSendInterval;
    }

    public EmailAccountInfo getDefaultEmailAccount() {
        return defaultEmailAccount;
    }

    public void setDefaultEmailAccount(EmailAccountInfo defaultEmailAccount) {
        this.defaultEmailAccount = defaultEmailAccount;
    }

}