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/*
* ============LICENSE_START=======================================================
* feature-server-pool
* ================================================================================
* Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.drools.serverpool;
import java.util.ArrayList;
import java.util.Collection;
import java.util.IdentityHashMap;
import java.util.UUID;
import org.onap.policy.drools.serverpooltest.ServerWrapper;
/**
* This class implements the 'ServerWrapper' interface. There is one
* 'ServerWrapperImpl' class for each simulated host.
*/
public class ServerWrapperImpl implements ServerWrapper {
// this maps a 'Server' instance on this host to an associated wrapper
private static IdentityHashMap<Server, ServerWrapperImpl> serverToWrapper =
new IdentityHashMap<>();
// this is the 'Server' instance associated with the wrapper
private Server server;
/**
* This method maps a 'Server' instance into a 'ServerWrapperImpl'
* instance. The goal is to have only a single 'ServerWrapperImpl' instance
* for each 'Server' instance, so that testing for identity will work
* as expected.
*
* @param server the 'Server' instance
* @return the associated 'ServerWrapperImpl' instance
* ('null' if 'server' is 'null')
*/
static synchronized ServerWrapperImpl getWrapper(Server server) {
if (server == null) {
return null;
}
ServerWrapperImpl rval = serverToWrapper.computeIfAbsent(server,
(key) -> new ServerWrapperImpl(server));
return rval;
}
/**
* Constructor - initialize the 'server' field.
*/
private ServerWrapperImpl(Server server) {
this.server = server;
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return server.toString();
}
/**
* {@inheritDoc}
*/
@Override
public UUID getUuid() {
return server.getUuid();
}
/**
* {@inheritDoc}
*/
@Override
public boolean isActive() {
return server.isActive();
}
/* ============================================================ */
/**
* This class implements the 'ServerWrapper.Static' interface. There is
* one 'ServerWrapperImpl.Static' class, and one instance for each
* simulated host
*/
public static class Static implements ServerWrapper.Static {
/**
* {@inheritDoc}
*/
@Override
public ServerWrapper getThisServer() {
return getWrapper(Server.getThisServer());
}
/**
* {@inheritDoc}
*/
@Override
public ServerWrapper getFirstServer() {
return getWrapper(Server.getFirstServer());
}
/**
* {@inheritDoc}
*/
@Override
public ServerWrapper getServer(UUID uuid) {
return getWrapper(Server.getServer(uuid));
}
/**
* {@inheritDoc}
*/
@Override
public int getServerCount() {
return Server.getServerCount();
}
/**
* {@inheritDoc}
*/
@Override
public Collection<ServerWrapper> getServers() {
// build an 'ArrayList' which mirrors the set of servers
ArrayList<ServerWrapper> rval = new ArrayList<>(Server.getServerCount());
for (Server server : Server.getServers()) {
rval.add(getWrapper(server));
}
return rval;
}
}
}
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