/*
* Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.event.input.adapter.core.internal;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.context.PrivilegedCarbonContext;
import org.wso2.carbon.event.input.adapter.core.InputEventAdapter;
import org.wso2.carbon.event.input.adapter.core.InputEventAdapterListener;
import org.wso2.carbon.event.input.adapter.core.InputEventAdapterSubscription;
import org.wso2.carbon.event.input.adapter.core.exception.ConnectionUnavailableException;
import org.wso2.carbon.event.input.adapter.core.exception.InputEventAdapterException;
import org.wso2.carbon.event.input.adapter.core.exception.InputEventAdapterRuntimeException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* Created on 2/27/15.
*/
public class InputAdapterRuntime implements InputEventAdapterListener {
private static Log log = LogFactory.getLog(InputAdapterRuntime.class);
private InputEventAdapter inputEventAdapter;
private String name;
private InputEventAdapterSubscription inputEventAdapterSubscription;
private volatile boolean connected = false;
private DecayTimer timer = new DecayTimer();
private volatile long nextConnectionTime;
private ExecutorService executorService;
private boolean startedTriggered = false;
private boolean startPollingTriggered = false;
private int tenantId;
public InputAdapterRuntime(InputEventAdapter inputEventAdapter, String name,
InputEventAdapterSubscription inputEventAdapterSubscription) throws InputEventAdapterException {
this.inputEventAdapter = inputEventAdapter;
this.name = name;
this.inputEventAdapterSubscription = inputEventAdapterSubscription;
this.tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
executorService = Executors.newSingleThreadExecutor();
synchronized (this) {
inputEventAdapter.init(this);
}
}
public void startPolling() {
startPollingTriggered = true;
if (!connected && startedTriggered && isPolling()) {
start();
}
}
public void start() {
try {
startedTriggered = true;
if (!isPolling() || startPollingTriggered) {
if (!connected) {
log.info("Connecting receiver " + this.name);
inputEventAdapter.connect();
connected = true;
}
} else {
log.info("Waiting to connect receiver " + this.name);
}
} catch (ConnectionUnavailableException e) {
connectionUnavailable(e);
} catch (InputEventAdapterRuntimeException e) {
connected = false;
inputEventAdapter.disconnect();
log.error("Error initializing Input Adapter '" + this.name + ", hence this will be suspended indefinitely, " + e.getMessage(), e);
}
}
public void destroy() {
if (inputEventAdapter != null) {
try {
inputEventAdapter.disconnect();
} catch (Throwable e) {
log.error("Error when disconnecting Input Adapter '" + name + "'," +
e.getMessage(), e);
} finally {
inputEventAdapter.destroy();
}
}
}
/**
* when an event happens event proxy call this method with the received event.
*
* @param object - received event
*/
@Override
public void onEvent(Object object) {
inputEventAdapterSubscription.onEvent(object);
}
@Override
public synchronized void connectionUnavailable(ConnectionUnavailableException connectionUnavailableException) {
try {
try {
if (!connected && connectionUnavailableException == null) {
if (nextConnectionTime <= System.currentTimeMillis()) {
inputEventAdapter.connect();
connected = true;
timer.reset();
}
} else {
connected = false;
inputEventAdapter.disconnect();
timer.incrementPosition();
nextConnectionTime = System.currentTimeMillis() + timer.returnTimeToWait();
if (timer.returnTimeToWait() == 0) {
log.error("Connection unavailable for Input Adapter '" + name + "' reconnecting.", connectionUnavailableException);
inputEventAdapter.connect();
} else {
log.error("Connection unavailable for Input Adapter '" + name + "' . Reconnection will be retried in " + (timer.returnTimeToWait()) + " milliseconds.", connectionUnavailableException);
executorService.execute(new Runnable() {
@Override
public void run() {
try {
PrivilegedCarbonContext.startTenantFlow();
PrivilegedCarbonContext.getThreadLocalCarbonContext().setTenantId(tenantId);
try {
Thread.sleep(timer.returnTimeToWait());
} catch (InterruptedException e) {
//nothing to be done
}
connectionUnavailable(null);
} finally {
PrivilegedCarbonContext.endTenantFlow();
}
}
});
}
}
} catch (ConnectionUnavailableException e) {
connectionUnavailable(e);
}
} catch (InputEventAdapterRuntimeException e) {
connected = false;
log.error("Error in connecting Input Adapter '" + this.name + "', hence this will be suspended indefinitely, " + e.getMessage(), e);
}
}
public boolean isEventDuplicatedInCluster() {
return inputEventAdapter.isEventDuplicatedInCluster();
}
public boolean isPolling() {
return inputEventAdapter.isPolling();
}
public String getName() {
return name;
}
}