GH-3199: Fix fail back with Long.MAX_VALUE

Resolves #3199

When the `refreshSharedInterval` was `Long.MAX_VALUE` the test for whether
the interval was exceeded always returned true.

Use a boolean instead (already in place on master).

I will backport to 5.1.x, 4.3.x after merge.

Author: garyrussell

spring-integration-ip/src/main/java/org/springframework/integration/ip/tcp/connection/FailoverClientConnectionFactory.java

@@ -52,6 +52,8 @@ public class FailoverClientConnectionFactory extends AbstractClientConnectionFac
 
 	private boolean closeOnRefresh;
 
+	private boolean failBack = true;
+
 	private volatile long creationTime;
 
 	/**
@@ -88,6 +90,7 @@ public void setRefreshSharedInterval(long refreshSharedInterval) {
 		Assert.isTrue(!this.cachingDelegates,
 				"'refreshSharedInterval' cannot be changed when using 'CachingClientConnectionFactory` delegates");
 		this.refreshSharedInterval = refreshSharedInterval;
+		this.failBack = refreshSharedInterval != Long.MAX_VALUE;
 	}
 
 	/**
@@ -154,7 +157,7 @@ public void registerSender(TcpSender sender) {
 	protected TcpConnectionSupport obtainConnection() throws Exception {
 		FailoverTcpConnection sharedConnection = (FailoverTcpConnection) getTheConnection();
 		boolean shared = !isSingleUse() && !this.cachingDelegates;
-		boolean refreshShared = shared
+		boolean refreshShared = this.failBack && shared
 				&& sharedConnection != null
 				&& System.currentTimeMillis() > this.creationTime + this.refreshSharedInterval;
 		if (sharedConnection != null && sharedConnection.isOpen() && !refreshShared) {

spring-integration-ip/src/test/java/org/springframework/integration/ip/tcp/connection/FailoverClientConnectionFactoryTests.java

@@ -22,6 +22,7 @@
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
+import static org.mockito.Matchers.any;
 import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.doThrow;
@@ -45,8 +46,6 @@
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
 
-import org.apache.log4j.Level;
-import org.junit.Rule;
 import org.junit.Test;
 import org.mockito.InOrder;
 import org.mockito.Mockito;
@@ -63,7 +62,6 @@
 import org.springframework.integration.ip.tcp.TcpInboundGateway;
 import org.springframework.integration.ip.tcp.TcpOutboundGateway;
 import org.springframework.integration.ip.util.TestingUtilities;
-import org.springframework.integration.test.rule.Log4jLevelAdjuster;
 import org.springframework.integration.test.util.TestUtils;
 import org.springframework.integration.util.SimplePool;
 import org.springframework.messaging.Message;
@@ -93,10 +91,6 @@ public void publishEvent(Object event) {
 
 	};
 
-	@Rule
-	public Log4jLevelAdjuster adjuster = new Log4jLevelAdjuster(Level.TRACE,
-			"org.springframework.integration.ip.tcp", "org.springframework.integration.util.SimplePool");
-
 	@Test
 	public void testFailoverGood() throws Exception {
 		AbstractClientConnectionFactory factory1 = mock(AbstractClientConnectionFactory.class);
@@ -126,15 +120,20 @@ public Object answer(InvocationOnMock invocation) throws Throwable {
 
 	@Test
 	public void testRefreshShared() throws Exception {
-		testRefreshShared(false);
+		testRefreshShared(false, 10_000);
 	}
 
 	@Test
 	public void testRefreshSharedCloseOnRefresh() throws Exception {
-		testRefreshShared(true);
+		testRefreshShared(true, 10_000);
+	}
+
+	@Test
+	public void testRefreshSharedInfinite() throws Exception {
+		testRefreshShared(false, Long.MAX_VALUE);
 	}
 
-	private void testRefreshShared(boolean closeOnRefresh) throws Exception {
+	private void testRefreshShared(boolean closeOnRefresh, long interval) throws Exception {
 		AbstractClientConnectionFactory factory1 = mock(AbstractClientConnectionFactory.class);
 		AbstractClientConnectionFactory factory2 = mock(AbstractClientConnectionFactory.class);
 		List<AbstractClientConnectionFactory> factories = new ArrayList<AbstractClientConnectionFactory>();
@@ -159,21 +158,29 @@ private void testRefreshShared(boolean closeOnRefresh) throws Exception {
 		failoverFactory.start();
 		TcpConnectionSupport connection = failoverFactory.getConnection();
 		assertNotNull(TestUtils.getPropertyValue(failoverFactory, "theConnection"));
-		failoverFactory.setRefreshSharedInterval(10_000);
+		failoverFactory.setRefreshSharedInterval(interval);
+		InOrder inOrder = inOrder(factory1, factory2, conn1, conn2);
+		inOrder.verify(factory1).getConnection();
+		inOrder.verify(factory2).getConnection();
+		inOrder.verify(conn1).registerListener(any());
+		inOrder.verify(conn1).isOpen();
 		assertSame(failoverFactory.getConnection(), connection);
+		inOrder.verifyNoMoreInteractions();
 		failoverFactory.setRefreshSharedInterval(-1);
 		assertNotSame(failoverFactory.getConnection(), connection);
-		InOrder inOrder = inOrder(factory1, factory2, conn1);
-		inOrder.verify(factory1).getConnection();
-		inOrder.verify(factory2).getConnection();
 		inOrder.verify(factory1).getConnection();
 		inOrder.verify(factory2).getConnection();
 		if (closeOnRefresh) {
+			inOrder.verify(conn2).registerListener(any());
+			inOrder.verify(conn2).isOpen();
 			inOrder.verify(conn1).close();
 		}
 		else {
+			inOrder.verify(conn1).registerListener(any());
+			inOrder.verify(conn1).isOpen();
 			inOrder.verify(conn1, never()).close();
 		}
+		inOrder.verifyNoMoreInteractions();
 	}
 
 	@Test(expected = IOException.class)