org.robotninjas.barge.rpc.netty.RpcChannelFactory.java Source code

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Here is the source code for org.robotninjas.barge.rpc.netty.RpcChannelFactory.java

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/**
 * Copyright 2013 David Rusek <dave dot rusek at gmail dot com>
 *
 * 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.robotninjas.barge.rpc.netty;

import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;

import org.apache.commons.pool.BaseKeyedPoolableObjectFactory;
import org.robotninjas.barge.Replica;
import org.robotninjas.protobuf.netty.client.NettyRpcChannel;
import org.robotninjas.protobuf.netty.client.RpcClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;

import static com.google.common.base.Preconditions.checkNotNull;

@Immutable
class RpcChannelFactory extends BaseKeyedPoolableObjectFactory<Object, ListenableFuture<NettyRpcChannel>> {

    private static final Logger LOGGER = LoggerFactory.getLogger(RpcChannelFactory.class);

    private final RpcClient client;

    public RpcChannelFactory(@Nonnull RpcClient client) {
        this.client = checkNotNull(client);
    }

    @Override
    public ListenableFuture<NettyRpcChannel> makeObject(Object key) throws Exception {
        Preconditions.checkArgument(key instanceof Replica);
        Replica replica = (Replica) key;
        return client.connectAsync(replica.address());
    }

    @Override
    public void destroyObject(Object key, ListenableFuture<NettyRpcChannel> obj) throws Exception {
        if (obj.isDone() && !obj.isCancelled()) {
            obj.get().close();
        } else {
            obj.cancel(false);
        }
    }

    @Override
    public boolean validateObject(Object key, ListenableFuture<NettyRpcChannel> obj) {
        return !obj.isDone() || (obj.isDone() && Futures.getUnchecked(obj).isOpen());
    }

}