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/*******************************************************************************
* Copyright 2016-2017 ZTE, Inc. and others.
*
* Licensed 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.onap.msb.apiroute.wrapper.consulextend.expose;
import java.util.concurrent.CopyOnWriteArrayList;
import org.onap.msb.apiroute.wrapper.consulextend.cache.ConsulCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.orbitz.consul.model.ConsulResponse;
public abstract class WatchTask<T> {
private final CopyOnWriteArrayList<Filter<T>> filters = new CopyOnWriteArrayList<Filter<T>>();
private final CopyOnWriteArrayList<Handler<T>> handlers = new CopyOnWriteArrayList<Handler<T>>();
private final static Logger LOGGER = LoggerFactory.getLogger(WatchTask.class);
// start
public abstract boolean startWatch();
// stop
public abstract boolean stopWatch();
// filters
public interface Filter<T> {
public boolean filter(final ConsulResponse<T> object);
}
public boolean addFilter(Filter<T> filter) {
boolean added = filters.add(filter);
return added;
}
public void removeAllFilter() {
filters.clear();
}
public final CopyOnWriteArrayList<Filter<T>> getAllFilters() {
return filters;
}
// handlers
public interface Handler<T> {
void handle(final ConsulResponse<T> object);
}
public boolean addHandler(Handler<T> handler) {
boolean added = handlers.add(handler);
return added;
}
public void removeAllHandler() {
handlers.clear();
}
// internal listener
protected class InternalListener implements ConsulCache.Listener<T> {
@Override
public void notify(ConsulResponse<T> newValues) {
long startTime = System.currentTimeMillis();
// filter
for (Filter<T> f : filters) {
// false,return
if (!f.filter(newValues)) {
return;
}
}
// handle
for (Handler<T> h : handlers) {
h.handle(newValues);
}
long endTime = System.currentTimeMillis();
if (endTime - startTime > 10 * 1000) {
LOGGER.info("WatchTask THEAD WORK TIMEOUT");
}
}
}
}
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