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-rw-r--r--core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java111
1 files changed, 55 insertions, 56 deletions
diff --git a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java
index 9cbd2050f..fd5fe131f 100644
--- a/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java
+++ b/core/core-engine/src/main/java/org/onap/policy/apex/core/engine/engine/impl/ApexEngineImpl.java
@@ -1,7 +1,7 @@
/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
- * Modifications Copyright (C) 2019 Nordix Foundation.
+ * Modifications Copyright (C) 2019-2020 Nordix Foundation.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -55,6 +55,7 @@ import org.slf4j.ext.XLoggerFactory;
* @author Liam Fallon
*/
public class ApexEngineImpl implements ApexEngine {
+
// Logger for this class
private static final XLogger LOGGER = XLoggerFactory.getXLogger(ApexEngineImpl.class);
@@ -68,6 +69,7 @@ public class ApexEngineImpl implements ApexEngine {
// The state of this engine
private AxEngineState state = AxEngineState.STOPPED;
+ private final Object stateLockObj = new Object();
// call back listeners
private final Map<String, EnEventListener> eventListeners = new LinkedHashMap<>();
@@ -89,7 +91,7 @@ public class ApexEngineImpl implements ApexEngine {
protected ApexEngineImpl(final AxArtifactKey key) {
argumentNotNull(key, "AxArtifactKey may not be null");
- LOGGER.entry("ApexEngine()->" + key.getId() + "," + state);
+ LOGGER.entry("ApexEngine()->{}, {}", key.getId(), state);
this.key = key;
@@ -106,16 +108,18 @@ public class ApexEngineImpl implements ApexEngine {
@Override
public void updateModel(final AxPolicyModel apexModel, final boolean isSubsequentInstance) throws ApexException {
if (apexModel != null) {
- LOGGER.entry("updateModel()->" + key.getId() + ", apexPolicyModel=" + apexModel.getKey().getId());
+ LOGGER.entry("updateModel()->{}, apexPolicyModel {}", key.getId(), apexModel.getKey().getId());
} else {
- LOGGER.warn(UPDATE_MODEL + key.getId() + ", Apex model not set");
throw new ApexException(UPDATE_MODEL + key.getId() + ", Apex model is not defined, it has a null value");
}
// The engine must be stopped in order to do a model update
- if (!state.equals(AxEngineState.STOPPED)) {
- throw new ApexException(UPDATE_MODEL + key.getId()
- + ", cannot update model, engine should be stopped but is in state " + state);
+ synchronized (stateLockObj) {
+ if (!state.equals(AxEngineState.STOPPED)) {
+ throw new ApexException(
+ UPDATE_MODEL + key.getId() + ", cannot update model, engine should be stopped but is in state "
+ + state);
+ }
}
// Create new internal context or update the existing one
@@ -128,10 +132,8 @@ public class ApexEngineImpl implements ApexEngine {
internalContext.update(apexModel, isSubsequentInstance);
}
} catch (final ContextException e) {
- LOGGER.warn(UPDATE_MODEL + key.getId() + ", error setting the context for engine \"" + key.getId() + "\"",
- e);
- throw new ApexException(UPDATE_MODEL + key.getId() + ", error setting the context for engine \""
- + key.getId() + "\"", e);
+ throw new ApexException(
+ UPDATE_MODEL + key.getId() + ", error setting the context for engine \"" + key.getId() + "\"", e);
}
// Set up the state machines
@@ -140,10 +142,8 @@ public class ApexEngineImpl implements ApexEngine {
// always set up as new
stateMachineHandler = new StateMachineHandler(internalContext);
} catch (final StateMachineException e) {
- LOGGER.warn(UPDATE_MODEL + key.getId() + ", error setting up the engine state machines \"" + key.getId()
- + "\"", e);
- throw new ApexException(UPDATE_MODEL + key.getId() + ", error setting up the engine state machines \""
- + key.getId() + "\"", e);
+ throw new ApexException(
+ UPDATE_MODEL + key.getId() + ", error setting up the engine state machines \"" + key.getId() + "\"", e);
}
LOGGER.exit(UPDATE_MODEL + key.getId());
@@ -154,20 +154,18 @@ public class ApexEngineImpl implements ApexEngine {
*/
@Override
public void start() throws ApexException {
- LOGGER.entry("start()" + key);
-
- if (state != AxEngineState.STOPPED) {
- String message = START + key.getId() + "," + state + ", cannot start engine, engine not in state STOPPED";
- LOGGER.warn(message);
- throw new ApexException(message);
+ LOGGER.entry("start() {}", key);
+ synchronized (stateLockObj) {
+ if (state != AxEngineState.STOPPED) {
+ String message =
+ START + key.getId() + "," + state + ", cannot start engine, engine not in state STOPPED";
+ throw new ApexException(message);
+ }
}
if (stateMachineHandler == null || internalContext == null) {
- String message = START + key.getId() + "," + state
- + ", cannot start engine, engine has not been initialized, its model is not loaded";
- LOGGER.warn(message);
throw new ApexException(START + key.getId() + "," + state
- + ", cannot start engine, engine has not been initialized, its model is not loaded");
+ + ", cannot start engine, engine has not been initialized, its model is not loaded");
}
// Set up the state machines
@@ -176,9 +174,8 @@ public class ApexEngineImpl implements ApexEngine {
stateMachineHandler.start();
engineStats.engineStart();
} catch (final StateMachineException e) {
- String message = UPDATE_MODEL + key.getId() + ", error starting the engine state machines \"" + key.getId()
- + "\"";
- LOGGER.warn(message, e);
+ String message =
+ UPDATE_MODEL + key.getId() + ", error starting the engine state machines \"" + key.getId() + "\"";
throw new ApexException(message, e);
}
@@ -193,20 +190,21 @@ public class ApexEngineImpl implements ApexEngine {
*/
@Override
public void stop() throws ApexException {
- LOGGER.entry("stop()->" + key);
+ LOGGER.entry("stop()-> {}", key);
// Check if the engine is already stopped
- if (state == AxEngineState.STOPPED) {
- throw new ApexException(
- STOP + key.getId() + "," + state + ", cannot stop engine, engine is already stopped");
+ synchronized (stateLockObj) {
+ if (state == AxEngineState.STOPPED) {
+ throw new ApexException(
+ STOP + key.getId() + "," + state + ", cannot stop engine, engine is already stopped");
+ }
}
-
// Stop the engine if it is in state READY, if it is in state EXECUTING, wait for execution to finish
- for (int increment = ApexEngineConstants.STOP_EXECUTION_WAIT_TIMEOUT;
- increment > 0; increment -= ApexEngineConstants.APEX_ENGINE_STOP_EXECUTION_WAIT_INCREMENT) {
+ for (int increment = ApexEngineConstants.STOP_EXECUTION_WAIT_TIMEOUT; increment > 0;
+ increment -= ApexEngineConstants.APEX_ENGINE_STOP_EXECUTION_WAIT_INCREMENT) {
ThreadUtilities.sleep(ApexEngineConstants.APEX_ENGINE_STOP_EXECUTION_WAIT_INCREMENT);
- synchronized (state) {
+ synchronized (stateLockObj) {
switch (state) {
// Engine is OK to stop or has been stopped on return of an event
case READY:
@@ -227,14 +225,14 @@ public class ApexEngineImpl implements ApexEngine {
break;
default:
- throw new ApexException(STOP + key.getId() + "," + state
- + ", cannot stop engine, engine is in an undefined state");
+ throw new ApexException(
+ STOP + key.getId() + "," + state + ", cannot stop engine, engine is in an undefined state");
}
}
}
// Force the engine to STOPPED state
- synchronized (state) {
+ synchronized (stateLockObj) {
state = AxEngineState.STOPPED;
}
@@ -246,10 +244,12 @@ public class ApexEngineImpl implements ApexEngine {
*/
@Override
public void clear() throws ApexException {
- LOGGER.entry("clear()->" + key);
- if (state != AxEngineState.STOPPED) {
- throw new ApexException("clear" + "()<-" + key.getId() + "," + state
- + ", cannot clear engine, engine is not stopped");
+ LOGGER.entry("clear()-> {}", key);
+ synchronized (stateLockObj) {
+ if (state != AxEngineState.STOPPED) {
+ throw new ApexException(
+ "clear" + "()<-" + key.getId() + "," + state + ", cannot clear engine, engine is not stopped");
+ }
}
// Clear everything
@@ -267,16 +267,18 @@ public class ApexEngineImpl implements ApexEngine {
*/
@Override
public EnEvent createEvent(final AxArtifactKey eventKey) {
- if (state != AxEngineState.READY && state != AxEngineState.EXECUTING) {
- LOGGER.warn("createEvent()<-{},{}, cannot create event, engine not in state READY", key.getId(), state);
- return null;
+ synchronized (stateLockObj) {
+ if (state != AxEngineState.READY && state != AxEngineState.EXECUTING) {
+ LOGGER.warn("createEvent()<-{},{}, cannot create event, engine not in state READY", key.getId(), state);
+ return null;
+ }
}
try {
// Create an event using the internal context
return new EnEvent(eventKey);
} catch (final Exception e) {
- LOGGER.warn("createEvent()<-" + key.getId() + "," + state + ", error on event creation", e);
+ LOGGER.warn("createEvent()<-{},{}, error on event creation: ", key.getId(), state, e);
return null;
}
}
@@ -292,7 +294,7 @@ public class ApexEngineImpl implements ApexEngine {
return ret;
}
- synchronized (state) {
+ synchronized (stateLockObj) {
if (state != AxEngineState.READY) {
LOGGER.warn("handleEvent()<-{},{}, cannot run engine, engine not in state READY", key.getId(), state);
return ret;
@@ -323,17 +325,17 @@ public class ApexEngineImpl implements ApexEngine {
synchronized (eventListeners) {
if (eventListeners.isEmpty()) {
LOGGER.debug("handleEvent()<-{},{}, There is no listener registered to recieve outgoing event: {}",
- key.getId(), state, outgoingEvent);
+ key.getId(), state, outgoingEvent);
}
for (final EnEventListener axEventListener : eventListeners.values()) {
axEventListener.onEnEvent(outgoingEvent);
}
}
} catch (final ApexException e) {
- LOGGER.warn("handleEvent()<-" + key.getId() + "," + state + ", outgoing event publishing error: ", e);
+ LOGGER.warn("handleEvent()<-{},{}, outgoing event publishing error: ", key.getId(), state, e);
ret = false;
}
- synchronized (state) {
+ synchronized (stateLockObj) {
// Only go to READY if we are still in state EXECUTING, we go to state STOPPED if we were STOPPING
if (state == AxEngineState.EXECUTING) {
state = AxEngineState.READY;
@@ -351,13 +353,11 @@ public class ApexEngineImpl implements ApexEngine {
public void addEventListener(final String listenerName, final EnEventListener listener) {
if (listenerName == null) {
String message = "addEventListener()<-" + key.getId() + "," + state + ", listenerName is null";
- LOGGER.warn(message);
throw new ApexRuntimeException(message);
}
if (listener == null) {
String message = "addEventListener()<-" + key.getId() + "," + state + ", listener is null";
- LOGGER.warn(message);
throw new ApexRuntimeException(message);
}
@@ -371,7 +371,6 @@ public class ApexEngineImpl implements ApexEngine {
public void removeEventListener(final String listenerName) {
if (listenerName == null) {
String message = "removeEventListener()<-" + key.getId() + "," + state + ", listenerName is null";
- LOGGER.warn(message);
throw new ApexRuntimeException(message);
}
@@ -418,7 +417,7 @@ public class ApexEngineImpl implements ApexEngine {
}
for (final Entry<AxArtifactKey, ContextAlbum> contextAlbumEntry : internalContext.getContextAlbums()
- .entrySet()) {
+ .entrySet()) {
currentContext.put(contextAlbumEntry.getKey(), contextAlbumEntry.getValue());
}
@@ -437,7 +436,7 @@ public class ApexEngineImpl implements ApexEngine {
/**
* Create an exception event from the incoming event including the exception information on the event.
*
- * @param incomingEvent The incoming event that caused the exception
+ * @param incomingEvent The incoming event that caused the exception
* @param eventException The exception that was thrown
* @return the exception event
*/