-/*******************************************************************************\r
- * ============LICENSE_START==================================================\r
- * * org.onap.dmaap\r
- * * ===========================================================================\r
- * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.\r
- * * ===========================================================================\r
- * * Licensed under the Apache License, Version 2.0 (the "License");\r
- * * you may not use this file except in compliance with the License.\r
- * * You may obtain a copy of the License at\r
- * * \r
- * * http://www.apache.org/licenses/LICENSE-2.0\r
- * * \r
- * * Unless required by applicable law or agreed to in writing, software\r
- * * distributed under the License is distributed on an "AS IS" BASIS,\r
- * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
- * * See the License for the specific language governing permissions and\r
- * * limitations under the License.\r
- * * ============LICENSE_END====================================================\r
- * *\r
- * * ECOMP is a trademark and service mark of AT&T Intellectual Property.\r
- * *\r
- ******************************************************************************/\r
-\r
-\r
-package org.onap.dmaap.datarouter.node;\r
-\r
-import java.util.*;\r
-\r
-/**\r
- * Execute an operation no more frequently than a specified interval\r
- */\r
-\r
-public abstract class RateLimitedOperation implements Runnable {\r
- private boolean marked; // a timer task exists\r
- private boolean executing; // the operation is currently in progress\r
- private boolean remark; // a request was made while the operation was in progress\r
- private Timer timer;\r
- private long last; // when the last operation started\r
- private long mininterval;\r
- /**\r
- * Create a rate limited operation\r
- * @param mininterval The minimum number of milliseconds after the last execution starts before a new execution can begin\r
- * @param timer The timer used to perform deferred executions\r
- */\r
- public RateLimitedOperation(long mininterval, Timer timer) {\r
- this.timer = timer;\r
- this.mininterval = mininterval;\r
- }\r
- private class deferred extends TimerTask {\r
- public void run() {\r
- execute();\r
- }\r
- }\r
- private synchronized void unmark() {\r
- marked = false;\r
- }\r
- private void execute() {\r
- unmark();\r
- request();\r
- }\r
- /**\r
- * Request that the operation be performed by this thread or at a later time by the timer\r
- */\r
- public void request() {\r
- if (premark()) {\r
- return;\r
- }\r
- do {\r
- run();\r
- } while (demark());\r
- }\r
- private synchronized boolean premark() {\r
- if (executing) {\r
- // currently executing - wait until it finishes\r
- remark = true;\r
- return(true);\r
- }\r
- if (marked) {\r
- // timer currently running - will run when it expires\r
- return(true);\r
- }\r
- long now = System.currentTimeMillis();\r
- if (last + mininterval > now) {\r
- // too soon - schedule a timer\r
- marked = true;\r
- timer.schedule(new deferred(), last + mininterval - now);\r
- return(true);\r
- }\r
- last = now;\r
- executing = true;\r
- // start execution\r
- return(false);\r
- }\r
- private synchronized boolean demark() {\r
- executing = false;\r
- if (remark) {\r
- remark = false;\r
- return(!premark());\r
- }\r
- return(false);\r
- }\r
-}\r
+/*******************************************************************************
+ * ============LICENSE_START==================================================
+ * * org.onap.dmaap
+ * * ===========================================================================
+ * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * * ===========================================================================
+ * * 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.
+ * * ============LICENSE_END====================================================
+ * *
+ * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ * *
+ ******************************************************************************/
+
+
+package org.onap.dmaap.datarouter.node;
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+/**
+ * Execute an operation no more frequently than a specified interval
+ */
+
+public abstract class RateLimitedOperation implements Runnable {
+
+ private boolean marked; // a timer task exists
+ private boolean executing; // the operation is currently in progress
+ private boolean remark; // a request was made while the operation was in progress
+ private Timer timer;
+ private long last; // when the last operation started
+ private long mininterval;
+
+ /**
+ * Create a rate limited operation
+ *
+ * @param mininterval The minimum number of milliseconds after the last execution starts before a new execution can
+ * begin
+ * @param timer The timer used to perform deferred executions
+ */
+ public RateLimitedOperation(long mininterval, Timer timer) {
+ this.timer = timer;
+ this.mininterval = mininterval;
+ }
+
+ /**
+ * Request that the operation be performed by this thread or at a later time by the timer
+ */
+ public void request() {
+ if (premark()) {
+ return;
+ }
+ do {
+ run();
+ } while (demark());
+ }
+
+ private synchronized boolean premark() {
+ if (executing) {
+ // currently executing - wait until it finishes
+ remark = true;
+ return (true);
+ }
+ if (marked) {
+ // timer currently running - will run when it expires
+ return (true);
+ }
+ long now = System.currentTimeMillis();
+ if (last + mininterval > now) {
+ // too soon - schedule a timer
+ marked = true;
+ timer.schedule(new Deferred(), last + mininterval - now);
+ return (true);
+ }
+ last = now;
+ executing = true;
+ // start execution
+ return (false);
+ }
+
+ private synchronized boolean demark() {
+ executing = false;
+ if (remark) {
+ remark = false;
+ return (!premark());
+ }
+ return (false);
+ }
+
+ private class Deferred extends TimerTask {
+
+ public void run() {
+ execute();
+ }
+
+ private void execute() {
+ unmark();
+ request();
+ }
+
+ private synchronized void unmark() {
+ marked = false;
+ }
+ }
+}
Code Review / dmaap / datarouter.git / blobdiff