author | ohair |
Tue, 25 May 2010 15:58:33 -0700 | |
changeset 5506 | 202f599c92aa |
parent 715 | f16baef3a20e |
child 13256 | 5886d7607acd |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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*/ |
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import java.rmi.*; |
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import sun.rmi.transport.*; |
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import sun.rmi.*; |
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import java.io.*; |
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import java.lang.reflect.*; |
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import java.rmi.dgc.*; |
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import java.util.*; |
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import java.rmi.registry.*; |
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import java.rmi.server.*; |
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public class TestImpl extends UnicastRemoteObject |
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implements Test { |
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static Thread locker = null; |
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static TestImpl foo = null; |
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static TestImpl bar = null; |
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TestImpl() throws RemoteException { |
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} |
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public String echo(String msg) throws RemoteException { |
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if (locker == null) { |
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// hold the target if not already held |
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locker = lockTargetExpireLeases(foo, DGCDeadLock.HOLD_TARGET_TIME); |
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} |
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return "Message received: " + msg; |
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} |
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static public void main(String[] args) { |
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Registry registry = null; |
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try { |
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registry = java.rmi.registry.LocateRegistry. |
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createRegistry(TestLibrary.REGISTRY_PORT); |
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//export "Foo" |
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foo = new TestImpl(); |
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Naming.rebind("rmi://:" + |
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TestLibrary.REGISTRY_PORT |
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+ "/Foo", foo); |
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try { |
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//export "Bar" after leases have been expired. |
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bar = new TestImpl(); |
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Naming.rebind("rmi://localhost:" + |
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TestLibrary.REGISTRY_PORT |
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+ "/Bar", bar); |
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} catch (Exception e) { |
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throw new RemoteException(e.getMessage()); |
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} |
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Thread.sleep(DGCDeadLock.TEST_FAIL_TIME); |
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System.err.println("object vm exiting..."); |
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System.exit(0); |
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} catch (Exception e) { |
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System.err.println(e.getMessage()); |
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e.printStackTrace(); |
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} finally { |
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TestLibrary.unexport(registry); |
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registry = null; |
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} |
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} |
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static Thread lockTargetExpireLeases(Remote toLock, int timeOut) { |
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Thread t = new Thread((Runnable) new TargetLocker(toLock, timeOut)); |
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t.start(); |
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return t; |
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} |
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static class TargetLocker implements Runnable { |
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Remote toLock = null; |
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int timeOut = 0; |
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TargetLocker(Remote toLock, int timeOut) { |
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this.toLock = toLock; |
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this.timeOut = timeOut; |
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} |
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public void run() { |
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try { |
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// give dgc dirty calls time to finish. |
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Thread.currentThread().sleep(4000); |
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java.security.AccessController. |
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doPrivileged(new LockTargetCheckLeases(toLock, |
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timeOut)); |
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} catch (Exception e) { |
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System.err.println(e.getMessage()); |
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e.printStackTrace(); |
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System.exit(1); |
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} |
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} |
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} |
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static class LockTargetCheckLeases |
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implements java.security.PrivilegedAction { |
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|
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Remote toLock = null; |
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int timeOut = 0; |
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LockTargetCheckLeases(Remote toLock, int timeOut) { |
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this.toLock = toLock; |
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this.timeOut = timeOut; |
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} |
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public Object run() { |
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try { |
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Class args[] = new Class[1]; |
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Class objTableClass = Class.forName |
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("sun.rmi.transport.ObjectTable"); |
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/* get the Target that corresponds to toLock from the |
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* ObjectTable |
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*/ |
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args[0] = Class.forName("java.rmi.Remote"); |
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Method objTableGetTarget = |
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objTableClass.getDeclaredMethod("getTarget", args ); |
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objTableGetTarget.setAccessible(true); |
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|
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Target lockTarget = |
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((Target) objTableGetTarget.invoke |
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(null , new Object [] {toLock} )); |
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// make sure the lease on this object has expired. |
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expireLeases(lockTarget); |
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// stop other threads from using the target for toLock. |
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synchronized (lockTarget) { |
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System.err.println("Locked the relevant target, sleeping " + |
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timeOut/1000 + " seconds"); |
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Thread.currentThread().sleep(timeOut); |
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System.err.println("Target unlocked"); |
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} |
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} catch (Exception e) { |
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System.err.println(e.getMessage()); |
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e.printStackTrace(); |
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System.exit(1); |
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} |
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return null; |
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} |
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} |
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/* leases have long values, so no dirty calls which would lock out |
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* a clean call, but the leases need to expire anyway, so we do it |
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* explicitly. |
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*/ |
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static void expireLeases(Target t) throws Exception { |
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final Target target = t; |
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java.security.AccessController.doPrivileged( |
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// put this into another class? |
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186 |
new java.security.PrivilegedAction() { |
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187 |
public Object run() { |
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188 |
try { |
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189 |
|
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190 |
Class DGCClass = Class.forName("sun.rmi.transport.DGCImpl"); |
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191 |
Method getDGCImpl = |
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192 |
DGCClass.getDeclaredMethod("getDGCImpl", null ); |
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193 |
getDGCImpl.setAccessible(true); |
2 | 194 |
|
309
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195 |
// make sure the lease on this object has expired. |
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196 |
DGC dgcImpl = ((DGC) getDGCImpl.invoke(null, null)); |
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197 |
|
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198 |
/* Get the lease table from the DGCImpl. */ |
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199 |
Field reflectedLeaseTable = |
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200 |
dgcImpl.getClass().getDeclaredField("leaseTable"); |
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201 |
reflectedLeaseTable.setAccessible(true); |
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202 |
|
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203 |
Map leaseTable = (Map) reflectedLeaseTable.get(dgcImpl); |
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204 |
|
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205 |
// dont really need this synchronization... |
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206 |
synchronized (leaseTable) { |
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207 |
Iterator en = leaseTable.values().iterator(); |
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208 |
while (en.hasNext()) { |
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209 |
Object info = en.next(); |
2 | 210 |
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309
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211 |
/* Get the notifySet in the leaseInfo object. */ |
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212 |
Field notifySetField = |
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213 |
info.getClass().getDeclaredField("notifySet"); |
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214 |
notifySetField.setAccessible(true); |
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215 |
HashSet notifySet = (HashSet) notifySetField.get(info); |
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216 |
|
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217 |
Iterator iter = notifySet.iterator(); |
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218 |
while (iter.hasNext()) { |
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219 |
Target notified = (Target) iter.next(); |
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220 |
|
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221 |
if (notified == target) { |
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222 |
|
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223 |
/* Get and set the expiration field from the info object. */ |
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224 |
Field expirationField = info.getClass(). |
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225 |
getDeclaredField("expiration"); |
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226 |
expirationField.setAccessible(true); |
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227 |
expirationField.setLong(info, 0); |
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228 |
} |
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229 |
} |
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230 |
} |
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231 |
} |
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232 |
} catch (Exception e) { |
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233 |
System.err.println(e.getMessage()); |
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234 |
e.printStackTrace(); |
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235 |
System.exit(1); |
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236 |
} |
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237 |
// no interesting return value for this privileged action |
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238 |
return null; |
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239 |
} |
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240 |
}); |
2 | 241 |
} |
242 |
} |