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/*
* 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;
}
});
}
}
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