1 files changed, 99 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0.1-RC1/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/extensibility/impl/DefaultHttpPortAllocatorImpl.java b/sca-java-2.x/tags/2.0.1-RC1/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/extensibility/impl/DefaultHttpPortAllocatorImpl.java
new file mode 100644
index 0000000000..544b1ea8df
--- /dev/null
+++ b/sca-java-2.x/tags/2.0.1-RC1/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/extensibility/impl/DefaultHttpPortAllocatorImpl.java
@@ -0,0 +1,99 @@
+/*
+ * 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.tuscany.sca.host.http.extensibility.impl;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+
+import org.apache.tuscany.sca.host.http.HttpScheme;
+import org.apache.tuscany.sca.host.http.extensibility.HttpPortAllocator;
+
+public class DefaultHttpPortAllocatorImpl implements HttpPortAllocator {
+
+    public int getDefaultPort(HttpScheme scheme) {
+        int port = 0;
+
+        if (scheme == null || scheme == HttpScheme.HTTP) {
+            try {
+                port = Integer.parseInt(getVariable("HTTP_PORT", String.valueOf(DEFAULT_HTTP_PORT)));
+                if (port == 0) {
+                    port = findFreePort(DEFAULT_HTTP_PORT, DEFAULT_HTTP_PORT + 1000);
+                }
+            } catch (NumberFormatException e) {
+                port = DEFAULT_HTTP_PORT;
+            }
+        } else if (scheme == HttpScheme.HTTPS) {
+            try {
+                port = Integer.parseInt(getVariable("HTTPS_PORT", String.valueOf(DEFAULT_HTTPS_PORT)));
+                if (port == 0) {
+                    port = findFreePort(DEFAULT_HTTPS_PORT, DEFAULT_HTTPS_PORT + 1000);
+                }
+            } catch (NumberFormatException e) {
+                port = DEFAULT_HTTPS_PORT;
+            }
+        }
+
+        return port;
+
+    }
+
+    private static String getVariable(final String variableName, final String defaultValue) {
+        return AccessController.doPrivileged(new PrivilegedAction<String>() {
+            public String run() {
+                String value = System.getProperty(variableName);
+                if (value == null || value.length() == 0) {
+                    value = System.getenv(variableName);
+                    if (value == null || value.length() == 0) {
+                        value = defaultValue;
+                    }
+                }
+                return value;
+            }
+        });
+    }
+
+    private int findFreePort(final int start, final int end) {
+        return AccessController.doPrivileged(new PrivilegedAction<Integer>() {
+            public Integer run() {
+                for (int p = start; p <= end; p++) {
+                    ServerSocket socket = null;
+                    try {
+                        socket = new ServerSocket(p);
+                        return p;
+                    } catch (IOException e) {
+                        // Ignore
+                    } finally {
+                        if (socket != null) {
+                            try {
+                                socket.close();
+                            } catch (IOException e) {
+                                // Ignore
+                            }
+                        }
+                    }
+                }
+                return -1;
+            }
+        });
+    }
+
+}