me.haohui.libhdfspp.NativeRpcEngine.java Source code

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Here is the source code for me.haohui.libhdfspp.NativeRpcEngine.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 me.haohui.libhdfspp;

import com.google.protobuf.ByteString;
import com.google.protobuf.Message;
import com.google.protobuf.MessageLite;
import org.apache.commons.io.Charsets;

import java.io.Closeable;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;

class NativeRpcEngine implements Closeable {
    private final long handle;

    NativeRpcEngine(NativeIoService ioService, byte[] clientName, String protocol, int version) {
        handle = create(ioService.handle(), clientName, protocol.getBytes(Charsets.UTF_8), version);
    }

    void connect(InetSocketAddress addr) throws IOException {
        byte[] status = connect(handle, addr.getAddress().getHostAddress(), addr.getPort());
        NativeStatus stat = new NativeStatus(status);
        stat.checkForIOException();
    }

    void startReadLoop() {
        startReadLoop(handle);
    }

    void rpc(byte[] method, MessageLite request, MessageLite.Builder response) throws IOException {
        byte[][] stat = new byte[1][];
        byte[] resp = rpc(handle, method, request.toByteArray(), stat);
        if (stat[0] != null) {
            NativeStatus status = new NativeStatus(stat[0]);
            status.checkForIOException();
        }
        response.clear().mergeFrom(resp);
    }

    @Override
    public void close() throws IOException {
        destroy(handle);
    }

    private native static long create(long ioService, byte[] clientName, byte[] protocol, int version);

    private native static byte[] connect(long handle, String host, int port);

    private native static void startReadLoop(long handle);

    private native static byte[] rpc(long handle, byte[] method, byte[] request, byte[][] status);

    private native static void destroy(long handle);
}