From 4dd443e6c843af8fac465100962abb059f2eb6d6 Mon Sep 17 00:00:00 2001
From: Mark Fisher <markfisher@vmware.com>
Date: Mon, 14 Jul 2008 12:38:05 +0000
Subject: [PATCH] Added Poller interface and SimplePoller implementation.

---
 .../integration/message/Poller.java           | 29 +++++++++
 .../integration/message/SimplePoller.java     | 64 +++++++++++++++++++
 2 files changed, 93 insertions(+)
 create mode 100644 org.springframework.integration/src/main/java/org/springframework/integration/message/Poller.java
 create mode 100644 org.springframework.integration/src/main/java/org/springframework/integration/message/SimplePoller.java

diff --git a/org.springframework.integration/src/main/java/org/springframework/integration/message/Poller.java b/org.springframework.integration/src/main/java/org/springframework/integration/message/Poller.java
new file mode 100644
index 0000000000..b402d2ed85
--- /dev/null
+++ b/org.springframework.integration/src/main/java/org/springframework/integration/message/Poller.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2002-2008 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.message;
+
+/**
+ * Strategy interface for polling a {@link MessageSource} and passing
+ * any Messages received from that source to a {@link MessageTarget}.
+ *
+ * @author Mark Fisher
+ */
+public interface Poller {
+
+	int poll(MessageSource<?> source, MessageTarget target);
+
+}
diff --git a/org.springframework.integration/src/main/java/org/springframework/integration/message/SimplePoller.java b/org.springframework.integration/src/main/java/org/springframework/integration/message/SimplePoller.java
new file mode 100644
index 0000000000..dd3c3f5678
--- /dev/null
+++ b/org.springframework.integration/src/main/java/org/springframework/integration/message/SimplePoller.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2002-2008 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.message;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * @author Mark Fisher
+ */
+public class SimplePoller implements Poller {
+
+	private final Log logger = LogFactory.getLog(this.getClass());
+
+	private long receiveTimeout = 5000;
+
+	private long sendTimeout = -1;
+
+
+	public void setReceiveTimeout(long receiveTimeout) {
+		this.receiveTimeout = receiveTimeout;
+	}
+
+	public void setSendTimeout(long sendTimeout) {
+		this.sendTimeout = sendTimeout;
+	}
+
+	public int poll(MessageSource<?> source, MessageTarget target) {
+		Message<?> message = (source instanceof BlockingSource && this.receiveTimeout >= 0) ?
+				((BlockingSource<?>) source).receive(this.receiveTimeout) : source.receive();
+		if (message == null) {
+			if (logger.isDebugEnabled()) {
+				logger.debug("received no Message from source '" + source + "'");
+			}
+			return 0;
+		}
+		boolean sent = (target instanceof BlockingTarget && this.sendTimeout >= 0) ?
+				((BlockingTarget) target).send(message, this.sendTimeout) : target.send(message);
+		if (source instanceof MessageDeliveryAware) {
+			if (sent) {
+				((MessageDeliveryAware) source).onSend(message);
+			}
+			else {
+				((MessageDeliveryAware) source).onFailure(new MessageDeliveryException(message, "failed to send message"));
+			}
+		}
+		return (sent ? 1 : 0);
+	}
+
+}