Java tutorial
/* * 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.facebook.presto.hive; import com.facebook.presto.hive.metastore.HiveMetastoreClient; import com.google.common.net.HostAndPort; import com.google.common.primitives.Ints; import io.airlift.units.Duration; import org.apache.thrift.transport.TSocket; import org.apache.thrift.transport.TTransport; import org.apache.thrift.transport.TTransportException; import javax.annotation.Nullable; import javax.inject.Inject; import java.io.Closeable; import java.io.IOException; import java.net.InetSocketAddress; import java.net.Proxy; import java.net.Socket; import java.net.SocketAddress; public class HiveMetastoreClientFactory { private final HostAndPort socksProxy; private final int timeoutMillis; public HiveMetastoreClientFactory(@Nullable HostAndPort socksProxy, Duration timeout) { this.socksProxy = socksProxy; this.timeoutMillis = Ints.checkedCast(timeout.toMillis()); } @Inject public HiveMetastoreClientFactory(HiveClientConfig config) { this(config.getMetastoreSocksProxy(), config.getMetastoreTimeout()); } private static Socket createSocksSocket(HostAndPort proxy) { SocketAddress address = InetSocketAddress.createUnresolved(proxy.getHostText(), proxy.getPort()); return new Socket(new Proxy(Proxy.Type.SOCKS, address)); } private static TTransportException rewriteException(TTransportException e, String host) { return new TTransportException(e.getType(), String.format("%s: %s", host, e.getMessage()), e.getCause()); } public HiveMetastoreClient create(String host, int port) throws TTransportException { return new ThriftHiveMetastoreClient(createTransport(host, port)); } protected TTransport createRawTransport(String host, int port) throws TTransportException { if (socksProxy == null) { TTransport transport = new TSocket(host, port, timeoutMillis); try { transport.open(); return transport; } catch (Throwable t) { transport.close(); throw t; } } Socket socks = createSocksSocket(socksProxy); try { try { socks.connect(InetSocketAddress.createUnresolved(host, port), timeoutMillis); socks.setSoTimeout(timeoutMillis); return new TSocket(socks); } catch (Throwable t) { closeQuietly(socks); throw t; } } catch (IOException e) { throw new TTransportException(e); } } protected TTransport createTransport(String host, int port) throws TTransportException { try { return new TTransportWrapper(createRawTransport(host, port), host); } catch (TTransportException e) { throw rewriteException(e, host); } } private static void closeQuietly(Closeable closeable) { try { closeable.close(); } catch (IOException e) { // ignored } } private static class TTransportWrapper extends TTransport { private final TTransport transport; private final String host; TTransportWrapper(TTransport transport, String host) { this.transport = transport; this.host = host; } @Override public boolean isOpen() { return transport.isOpen(); } @Override public boolean peek() { return transport.peek(); } @Override public byte[] getBuffer() { return transport.getBuffer(); } @Override public int getBufferPosition() { return transport.getBufferPosition(); } @Override public int getBytesRemainingInBuffer() { return transport.getBytesRemainingInBuffer(); } @Override public void consumeBuffer(int len) { transport.consumeBuffer(len); } @Override public void close() { transport.close(); } @Override public void open() throws TTransportException { try { transport.open(); } catch (TTransportException e) { throw rewriteException(e, host); } } @Override public int readAll(byte[] bytes, int off, int len) throws TTransportException { try { return transport.readAll(bytes, off, len); } catch (TTransportException e) { throw rewriteException(e, host); } } @Override public int read(byte[] bytes, int off, int len) throws TTransportException { try { return transport.read(bytes, off, len); } catch (TTransportException e) { throw rewriteException(e, host); } } @Override public void write(byte[] bytes) throws TTransportException { try { transport.write(bytes); } catch (TTransportException e) { throw rewriteException(e, host); } } @Override public void write(byte[] bytes, int off, int len) throws TTransportException { try { transport.write(bytes, off, len); } catch (TTransportException e) { throw rewriteException(e, host); } } @Override public void flush() throws TTransportException { try { transport.flush(); } catch (TTransportException e) { throw rewriteException(e, host); } } } }