"tallpsmith" wrote :
| Lets assume a local TreeCache with isolation Level set to Serializable.
|
Are you sure you set the isolation level correctly ? Did you do:
cache.setIsolationLevel(IsolationLevel.SERIALIZABLE);
or set it via XML ?
Look at the code below, works exactly as it should: thread2 has to wait for
3secs until it can (read) access the data.
| public void testConcurrentReadsWithSerializableIsolationLevel() throws
CacheException, InterruptedException {
| final long TIMEOUT=5000;
| cache.setIsolationLevel(IsolationLevel.SERIALIZABLE);
| cache.put("/testfqn", "testkey", "testvalue"); // add initial value,
to be read by threads
| Reader r1, r2;
| r1=new Reader("reader1", 3000);
| r2=new Reader("reader2", 0);
| r1.start();
| pause(100); // make sure thread1 starts and acquires the lock before
thread2
| r2.start();
| r1.join(TIMEOUT);
| r2.join(TIMEOUT);
| }
|
| class Reader extends Thread {
| long timeout;
|
| public Reader(String name, long timeout) {
| super(name);
| this.timeout=timeout;
| }
|
| public void run() {
| UserTransaction trans=null;
| try {
| trans=(UserTransaction)new
InitialContext(p).lookup("UserTransaction");
| trans.begin();
| Object retval=null;
| log2("accessing tree");
| retval=cache.get("testfqn", "testkey");
| log2("retval: " + retval);
| if(timeout > 0) {
| log2("sleeping for " + timeout + " ms");
| pause(timeout);
| }
| }
| catch(Exception e) {
| e.printStackTrace();
| }
| finally {
| try {trans.commit();} catch(Throwable t) {}
| log2("done");
| }
| }
| }
|
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