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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.dubbo.registry.retry;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.timer.Timeout;
import org.apache.dubbo.common.timer.Timer;
import org.apache.dubbo.common.timer.TimerTask;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.registry.support.FailbackRegistry;
import java.util.concurrent.TimeUnit;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.REGISTRY_EXECUTE_RETRYING_TASK;
import static org.apache.dubbo.registry.Constants.DEFAULT_REGISTRY_RETRY_PERIOD;
import static org.apache.dubbo.registry.Constants.DEFAULT_REGISTRY_RETRY_TIMES;
import static org.apache.dubbo.registry.Constants.REGISTRY_RETRY_PERIOD_KEY;
import static org.apache.dubbo.registry.Constants.REGISTRY_RETRY_TIMES_KEY;
/**
* AbstractRetryTask
*/
public abstract class AbstractRetryTask implements TimerTask {
protected final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(getClass());
/**
* url for retry task
*/
protected final URL url;
/**
* registry for this task
*/
protected final FailbackRegistry registry;
/**
* retry period
*/
private final long retryPeriod;
/**
* define the most retry times
*/
private final int retryTimes;
/**
* task name for this task
*/
private final String taskName;
/**
* times of retry.
* retry task is execute in single thread so that the times is not need volatile.
*/
private int times = 1;
private volatile boolean cancel;
AbstractRetryTask(URL url, FailbackRegistry registry, String taskName) {
if (url == null || StringUtils.isBlank(taskName)) {
throw new IllegalArgumentException();
}
this.url = url;
this.registry = registry;
this.taskName = taskName;
this.cancel = false;
this.retryPeriod = url.getParameter(REGISTRY_RETRY_PERIOD_KEY, DEFAULT_REGISTRY_RETRY_PERIOD);
this.retryTimes = url.getParameter(REGISTRY_RETRY_TIMES_KEY, DEFAULT_REGISTRY_RETRY_TIMES);
}
public void cancel() {
cancel = true;
}
public boolean isCancel() {
return cancel;
}
protected void reput(Timeout timeout, long tick) {
if (timeout == null) {
throw new IllegalArgumentException();
}
Timer timer = timeout.timer();
if (timer.isStop() || timeout.isCancelled() || isCancel()) {
return;
}
times++;
timer.newTimeout(timeout.task(), tick, TimeUnit.MILLISECONDS);
}
@Override
public void run(Timeout timeout) throws Exception {
if (timeout.isCancelled() || timeout.timer().isStop() || isCancel()) {
// other thread cancel this timeout or stop the timer.
return;
}
if (times > retryTimes) {
// 1-13 - failed to execute the retrying task.
logger.warn(
REGISTRY_EXECUTE_RETRYING_TASK, "registry center offline", "Check the registry server.",
"Final failed to execute task " + taskName + ", url: " + url + ", retry " + retryTimes + " times.");
return;
}
if (logger.isInfoEnabled()) {
logger.info(taskName + " : " + url);
}
try {
doRetry(url, registry, timeout);
} catch (Throwable t) { // Ignore all the exceptions and wait for the next retry
// 1-13 - failed to execute the retrying task.
logger.warn(REGISTRY_EXECUTE_RETRYING_TASK, "registry center offline", "Check the registry server.",
"Failed to execute task " + taskName + ", url: " + url + ", waiting for again, cause:" + t.getMessage(), t);
// reput this task when catch exception.
reput(timeout, retryPeriod);
}
}
protected abstract void doRetry(URL url, FailbackRegistry registry, Timeout timeout);
}