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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* 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.openvpp.jvpp.future;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import org.openvpp.jvpp.JVpp;
import org.openvpp.jvpp.dto.ControlPing;
import org.openvpp.jvpp.dto.JVppDump;
import org.openvpp.jvpp.dto.JVppReply;
import org.openvpp.jvpp.dto.JVppReplyDump;
import org.openvpp.jvpp.dto.JVppRequest;
/**
* Future facade on top of JVpp
*/
public class FutureJVppInvokerFacade implements FutureJVppInvoker {
private final JVpp jvpp;
/**
* Guarded by self
*/
private final Map<Integer, CompletableFuture<? extends JVppReply<?>>> requests;
public FutureJVppInvokerFacade(final JVpp jvpp,
final Map<Integer, CompletableFuture<? extends JVppReply<?>>> requestMap) {
// TODO use guava's preconditions for nonNull and state checks
// However adding guava as a dependency requires better build system for Java in VPP project
// Currently it's just invocation of javac
if(jvpp == null) {
throw new NullPointerException("Null jvpp");
}
this.jvpp = jvpp;
if(requestMap == null) {
throw new NullPointerException("Null requestMap");
}
// Request map represents the shared state between this facade and it's callback
// where facade puts futures in and callback completes + removes them
// TODO what if the call never completes ?
this.requests = requestMap;
}
// TODO use Optional in Future, java8
@Override
@SuppressWarnings("unchecked")
public <REQ extends JVppRequest, REPLY extends JVppReply<REQ>> CompletionStage<REPLY> send(REQ req) {
synchronized(requests) {
final int contextId = jvpp.send(req);
final CompletableFuture<REPLY> replyCompletableFuture;
if(req instanceof JVppDump) {
replyCompletableFuture = (CompletableFuture<REPLY>) new CompletableDumpFuture<>(contextId);
} else {
replyCompletableFuture = new CompletableFuture<>();
}
requests.put(contextId, replyCompletableFuture);
if(req instanceof JVppDump) {
requests.put(jvpp.send(new ControlPing()), replyCompletableFuture);
}
return replyCompletableFuture;
}
}
static final class CompletableDumpFuture<T extends JVppReplyDump<?, ?>> extends CompletableFuture<T> {
// The reason why this is not final is the instantiation of ReplyDump DTOs
// Their instantiation must be generated, so currently the DTOs are created in callback and set when first dump reponses
// is handled in the callback.
private T replyDump;
private final long contextId;
CompletableDumpFuture(final long contextId) {
this.contextId = contextId;
}
long getContextId() {
return contextId;
}
T getReplyDump() {
return replyDump;
}
void setReplyDump(final T replyDump) {
this.replyDump = replyDump;
}
}
@Override
public void close() throws Exception {
// NOOP
}
}
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