/*
* Copyright 2014 NAVER Corp.
*
* 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 com.navercorp.pinpoint.web.service;
import com.navercorp.pinpoint.web.vo.Application;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.HashSet;
import java.util.Set;
/**
* @author emeroad
*/
public class LinkVisitChecker {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private final Set<Application> calleeFound = new HashSet<>();
private final Set<Application> callerFound = new HashSet<>();
public boolean visitCaller(Application caller) {
return visit(callerFound, caller, "Caller");
}
public boolean isVisitedCaller(Application caller) {
return callerFound.contains(caller);
}
public boolean visitCallee(Application callee) {
return visit(calleeFound, callee, "Callee");
}
private boolean visit(Set<Application> visitedSet, Application application, String type) {
if (application == null) {
throw new NullPointerException("application must not be null");
}
final boolean alreadyVisited = !visitedSet.add(application);
if (logger.isDebugEnabled()) {
if (alreadyVisited) {
logger.debug("LinkData exists. Skip finding {}. {} ", type, application);
} else {
logger.debug("Finding {}. {}={}", type, type, application);
}
}
return alreadyVisited;
}
}