INT-1747 added the new class ResubmittingTask

spring-integration-mail/src/main/java/org/springframework/integration/mail/ResubmittingTask.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2002-2011 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.springframework.integration.mail;
+
+import java.security.ProviderException;
+import java.util.Date;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import org.springframework.scheduling.TaskScheduler;
+
+/**
+ * @author Mark Fisher
+ * @author Oleg Zhurakousky
+ * @since 2.0.2
+ *
+ */
+class ResubmittingTask implements Runnable {
+	private static final Log logger = LogFactory.getLog(ResubmittingTask.class);
+	private final Runnable targetTask;
+	private final TaskScheduler scheduler;
+	private final long delay;
+	
+	public ResubmittingTask(Runnable targetTask, TaskScheduler scheduler, long delay) {
+		this.targetTask = targetTask;
+		this.scheduler = scheduler;
+		this.delay = delay;
+	}
+
+	public void run() {
+		try {
+			targetTask.run();
+			logger.debug("Task completed successfully. Re-scheduling it again right away");
+			scheduler.schedule(this, new Date());
+		}
+		catch (ProviderException e) { //run again after a delay
+			logger.warn("Failed to execute IDLE task. Will atempt to resubmit in " + delay + " milliseconds", e);
+			scheduler.schedule(this, new Date(System.currentTimeMillis() + delay));
+		}
+	}
+}