make server threads configurable with server.properties file (#11540)

Co-authored-by: Ahmed Awlaqi <ahmed.awlaqi@sue.nl>
Co-authored-by: Daan Hoogland <dahn@apache.org>

Author: 3 people

client/conf/server.properties.in

@@ -58,3 +58,7 @@ access.log=/var/log/cloudstack/management/access.log
 
 # The deployment mode for the extensions
 extensions.deployment.mode=@EXTENSIONSDEPLOYMENTMODE@
+
+# Thread pool configuration
+#threads.min=10
+#threads.max=500

client/src/main/java/org/apache/cloudstack/ServerDaemon.java

@@ -86,6 +86,8 @@ public class ServerDaemon implements Daemon {
     private static final int DEFAULT_REQUEST_CONTENT_SIZE = 1048576;
     private static final String REQUEST_MAX_FORM_KEYS_KEY = "request.max.form.keys";
     private static final int DEFAULT_REQUEST_MAX_FORM_KEYS = 5000;
+    private static final String THREADS_MIN = "threads.min";
+    private static final String THREADS_MAX = "threads.max";
 
     ////////////////////////////////////////////////////////
     /////////////// Server Configuration ///////////////////
@@ -106,6 +108,8 @@ public class ServerDaemon implements Daemon {
     private String keystoreFile;
     private String keystorePassword;
     private String webAppLocation;
+    private int minThreads;
+    private int maxThreads;
 
     //////////////////////////////////////////////////
     /////////////// Public methods ///////////////////
@@ -147,6 +151,8 @@ public void init(final DaemonContext context) {
             setSessionTimeout(Integer.valueOf(properties.getProperty(SESSION_TIMEOUT, "30")));
             setMaxFormContentSize(Integer.valueOf(properties.getProperty(REQUEST_CONTENT_SIZE_KEY, String.valueOf(DEFAULT_REQUEST_CONTENT_SIZE))));
             setMaxFormKeys(Integer.valueOf(properties.getProperty(REQUEST_MAX_FORM_KEYS_KEY, String.valueOf(DEFAULT_REQUEST_MAX_FORM_KEYS))));
+            setMinThreads(Integer.valueOf(properties.getProperty(THREADS_MIN, "10")));
+            setMaxThreads(Integer.valueOf(properties.getProperty(THREADS_MAX, "500")));
         } catch (final IOException e) {
             logger.warn("Failed to read configuration from server.properties file", e);
         } finally {
@@ -164,8 +170,8 @@ public void init(final DaemonContext context) {
     public void start() throws Exception {
         // Thread pool
         final QueuedThreadPool threadPool = new QueuedThreadPool();
-        threadPool.setMinThreads(10);
-        threadPool.setMaxThreads(500);
+        threadPool.setMinThreads(minThreads);
+        threadPool.setMaxThreads(maxThreads);
 
         // Jetty Server
         server = new Server(threadPool);
@@ -394,4 +400,12 @@ public void setMaxFormContentSize(int maxFormContentSize) {
     public void setMaxFormKeys(int maxFormKeys) {
         this.maxFormKeys = maxFormKeys;
     }
+
+    public void setMinThreads(int minThreads) {
+        this.minThreads = minThreads;
+    }
+
+    public void setMaxThreads(int maxThreads) {
+        this.maxThreads = maxThreads;
+    }
 }