[GitHub] [shardingsphere-elasticjob] luky116 commented on a change in pull request #1474: Add EmailJobErrorHandler to support sending email when job error

[GitBox <gi...@apache.org>]

luky116 commented on a change in pull request #1474:
URL: https://github.com/apache/shardingsphere-elasticjob/pull/1474#discussion_r491880610



##########
File path: elasticjob-error-handler/elasticjob-error-handler-email/src/main/java/org/apache/shardingsphere/elasticjob/error/handler/email/EmailJobErrorHandler.java
##########
@@ -0,0 +1,126 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.shardingsphere.elasticjob.error.handler.email;
+
+import com.google.common.base.Preconditions;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.shardingsphere.elasticjob.error.handler.JobErrorHandler;
+
+import javax.mail.Authenticator;
+import javax.mail.BodyPart;
+import javax.mail.Message;
+import javax.mail.MessagingException;
+import javax.mail.Multipart;
+import javax.mail.PasswordAuthentication;
+import javax.mail.Session;
+import javax.mail.Transport;
+import javax.mail.internet.InternetAddress;
+import javax.mail.internet.MimeBodyPart;
+import javax.mail.internet.MimeMessage;
+import javax.mail.internet.MimeMultipart;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.Date;
+import java.util.Properties;
+
+/**
+ * Job error handler for sending error message by email.
+ */
+@Slf4j
+public final class EmailJobErrorHandler implements JobErrorHandler {
+    
+    public static final String CONFIG_PREFIX = "email";
+    
+    private EmailConfiguration emailConfiguration;
+    
+    private Session session;
+    
+    public EmailJobErrorHandler() {
+        loadConfiguration();
+    }
+    
+    @Override
+    public void handleException(final String jobName, final Throwable cause) {
+        try {
+            Preconditions.checkNotNull(emailConfiguration);
+            String content = buildContent(jobName, cause);
+            Message message = buildMessage(content);
+            sendMessage(message);
+        } catch (final NullPointerException | MessagingException ex) {
+            log.error("Elastic job: email job handler error", ex);
+        }

Review comment:
       if user don't set email configuration, Preconditions.checkNotNull(emailConfiguration) will throws NullPointerException,it menas user don't want email handler. So here will catch NullPointerException.




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