From b1c8641a63a67e3c64d948f9e8dce5c01e11e2dd Mon Sep 17 00:00:00 2001
From: mcentner <mcentner@8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4>
Date: Wed, 5 May 2010 15:29:01 +0000
Subject: Merged feature branch mocca-1.2.13-id@r724 back to trunk.

git-svn-id: https://joinup.ec.europa.eu/svn/mocca/trunk@725 8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4
---
 .../egiz/bku/local/stal/ExclusiveAccessSTAL.java   | 76 ++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 BKULocal/src/main/java/at/gv/egiz/bku/local/stal/ExclusiveAccessSTAL.java

(limited to 'BKULocal/src/main/java/at/gv/egiz/bku/local/stal/ExclusiveAccessSTAL.java')

diff --git a/BKULocal/src/main/java/at/gv/egiz/bku/local/stal/ExclusiveAccessSTAL.java b/BKULocal/src/main/java/at/gv/egiz/bku/local/stal/ExclusiveAccessSTAL.java
new file mode 100644
index 00000000..0b8511e3
--- /dev/null
+++ b/BKULocal/src/main/java/at/gv/egiz/bku/local/stal/ExclusiveAccessSTAL.java
@@ -0,0 +1,76 @@
+/*
+* Copyright 2009 Federal Chancellery Austria and
+* Graz University of Technology
+*
+* 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.
+*/
+
+package at.gv.egiz.bku.local.stal;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import at.gv.egiz.stal.ErrorResponse;
+import at.gv.egiz.stal.STAL;
+import at.gv.egiz.stal.STALRequest;
+import at.gv.egiz.stal.STALResponse;
+
+public class ExclusiveAccessSTAL implements STAL {
+  
+  private final Logger log = LoggerFactory.getLogger(ExclusiveAccessSTAL.class);
+  
+  private Lock lock = new ReentrantLock(true);
+  
+  private long timeout = 30;
+  
+  private STAL stal;
+  
+  public ExclusiveAccessSTAL(STAL stal) {
+    if (stal == null) {
+      throw new NullPointerException("Argument 'stal' must not be null.");
+    }
+    this.stal = stal;
+  }
+
+  @Override
+  public List<STALResponse> handleRequest(
+      List<? extends STALRequest> aRequestList) {
+
+    try {
+      if (lock.tryLock(timeout, TimeUnit.SECONDS)) {
+        try {
+          return stal.handleRequest(aRequestList);
+        } finally {
+          lock.unlock();
+        }
+      } else {
+        // time out
+        log.info("Timeout while waiting for exclusive access to STAL.");
+        ErrorResponse response = new ErrorResponse(6000);
+        return Collections.singletonList((STALResponse) response);
+      }
+    } catch (InterruptedException e) {
+      // interrupted
+      ErrorResponse response = new ErrorResponse(6000);
+      return Collections.singletonList((STALResponse) response);
+    }
+    
+  }
+
+}
-- 
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