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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.tuscany.sca.guardian.itests;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.tuscany.sca.guardian.Context;
import org.apache.tuscany.sca.guardian.GlobalException;
import org.apache.tuscany.sca.guardian.GuardianMember;
import org.osoa.sca.annotations.Init;
import org.osoa.sca.annotations.Reference;
import org.osoa.sca.annotations.Scope;
import org.osoa.sca.annotations.Destroy;
import org.osoa.sca.annotations.OneWay;
@Scope("COMPOSITE")
public class NodeImpl implements Node, TestInterface {
private static int PRIMARY = 0;
private static int BACKUP = 1;
private boolean isBlocked;
private Context mainContext;
private Context primaryContext;
private Context backupContext;
private int role;
private boolean isExecuting;
private String pID;
private Queue<String> updates;
@Reference(name = "guardian_member", required = true)
public GuardianMember gm;
@Reference(name = "node", required = true)
public Node node;
private boolean forcePSFException;
private boolean forceAUFException;
public NodeImpl() {
mainContext = new Context("MAIN");
mainContext.addException(PrimaryFailedException.class);
mainContext.addException(PrimaryExistsException.class);
primaryContext = new Context("PRIMARY");
primaryContext.addException(BackupFailedException.class);
primaryContext.addException(BackupJoinedException.class);
primaryContext.addException(PrimaryServiceFailureException.class);
backupContext = new Context("BACKUP", null);
updates = new LinkedList();
isBlocked = false;
isExecuting = false;
node = null;
forcePSFException = false;
forceAUFException = false;
}
@Init
public void init() {
gm.setService(this);
pID = gm.getParticipantIdentifier();
}
@Destroy
public void destroy() {
gm.removeService();
}
public boolean isExecuting() {
return isExecuting;
}
@OneWay
public void execute() {
isExecuting = true;
gm.enableContext(mainContext);
role = PRIMARY;
while (true) {
try {
System.out.println(pID + "#Main context: ");
sleep(pID + "#Sleeping at main context...", 4000);
gm.checkExceptionStatus();
if (role == PRIMARY) {
//Config as primary then...
primaryService();
} else {
//Config as backup then...
backupService();
}
} catch (PrimaryExistsException ex) {
System.out.println(pID + "# Exception captured!: PrimaryExistsException");
System.out.println(pID + "#Needs propagation?: " + gm.propagate(ex));
if (gm.propagate(ex)) {
throw ex;
}
role = BACKUP;
} catch (PrimaryFailedException ex) {
System.out.println(pID + "# Exception captured!: PrimaryFailedException");
System.out.println(pID + "#Needs propagation?: " + gm.propagate(ex));
if (gm.propagate(ex)) {
//throw ex;
ex.printStackTrace();
return;
}
role = PRIMARY;
} catch (BackupFailedException ex) {
System.out.println(pID + "# Exception captured!: BackupFailedException");
System.out.println(pID + "#Needs propagation?: " + gm.propagate(ex));
if (gm.propagate(ex)) {
//throw ex;
ex.printStackTrace();
return;
}
}
}
}
private void sleep(String msg, int millis) {
try {
System.out.println(msg);
Thread.sleep(millis);
} catch (InterruptedException ex) {
Logger.getLogger(NodeImpl.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void primaryService() {
boolean backupAvailable = false;
int upcount = 1;
while (true) {
gm.enableContext(primaryContext);
try {
System.out.println(pID + "#Primary context: ");
sleep(pID + "#Sleeping at primary context...", 4000);
gm.checkExceptionStatus();
//Process the request then...
System.out.println(pID + "#Processing the request...");
//Check for an internal error
if (forcePSFException) {
throw new PrimaryServiceFailureException();
}
if (backupAvailable && node.isExecuting()) {
node.sendUpdate("Update " + upcount);
upcount++;
} else {
System.out.println(pID + "#No backup available to send updates!");
}
//send the reply to the client
System.out.println(pID + "#Sending the reply to the client...");
} catch (PrimaryServiceFailureException ex) {
System.out.println(pID + "# Exception captured!: PrimaryServiceFailureException");
gm.gthrow(new PrimaryFailedException(), null);
} catch (BackupFailedException ex) {
System.out.println(pID + "# Exception captured!: BackupFailedException");
backupAvailable = false;
} catch (BackupJoinedException ex) {
System.out.println(pID + "# Exception captured!: BackupJoinedException");
backupAvailable = true;
} finally {
gm.removeContext();
}
}
}
private void backupService() {
while (true) {
gm.enableContext(backupContext);
try {
System.out.println(pID + "#Backup context: ");
sleep(pID + "#Sleeping at backup service", 4000);
gm.checkExceptionStatus();
applyUpdate();
if (forceAUFException) {
throw new ApplyUpdateFailureException();
}
} catch (ApplyUpdateFailureException ex) {
System.out.println(pID + "# Exception captured!: ApplyUpdateFailureException");
gm.gthrow(new BackupFailedException(), null);
} finally {
gm.removeContext();
}
}
}
//FIXME - It is not working asynchronously
//@OneWay
public void block() {
System.out.println(pID + "#Participant blocked!");
isBlocked = true;
// while (isBlocked) {
// try {
// Thread.sleep(5000);
// } catch (InterruptedException ex) {
// Logger.getLogger(ComponentImpl.class.getName()).log(Level.SEVERE, null, ex);
// }
// }
}
public boolean isBlocked() {
return isBlocked;
}
//@OneWay
public void unblock() {
System.out.println(pID + "#Participant unblocked!");
isBlocked = false;
}
public void sendUpdate(String update) {
System.out.println(pID + "#Receiving updates from primary: " + update);
updates.offer(update);
}
public void applyUpdate() {
System.out.println(pID + "#Applying the updates received from the primary: " + updates.poll());
}
public void forcePrimaryServiceFailureException() {
forcePSFException = true;
}
public void forceApplyUpdateFailureException() {
forceAUFException = true;
}
}
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