content: /*
   * 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 org.apache.carbon.flink;
  
  import java.io.IOException;
  
  import org.apache.flink.core.fs.RecoverableFsDataOutputStream;
  import org.apache.flink.core.fs.RecoverableWriter;
  
  public final class ProxyRecoverableOutputStream extends RecoverableFsDataOutputStream {
  
    ProxyRecoverableOutputStream() {
      // protected constructor.
    }
  
    private ProxyFileWriter<?> writer;
  
    public void bind(final ProxyFileWriter<?> writer) {
      if (writer == null) {
        throw new IllegalArgumentException("Argument [writer] is null.");
      }
      if (this.writer != null) {
        throw new IllegalStateException("The writer was bound.");
      }
      this.writer = writer;
    }
  
    @Override
    public long getPos() {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public RecoverableWriter.ResumeRecoverable persist() {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public void write(final int aByte) {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public void flush() {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public void sync() {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public void close() {
      // TODO streaming结束的时候和出异常的时候都会调用该方法
      if (this.writer != null) {
        this.writer.close();
      }
    }
  
    @Override
    public Committer closeForCommit() {
      if (this.writer == null) {
        throw new IllegalStateException("The writer was not bound.");
      }
      return new Committer(
          new ProxyRecoverable(
              this.writer.getFactory().getType(),
              this.writer.getFactory().getConfiguration(),
              this.writer.getIdentifier(),
              this.writer.getPath()
          )
      );
    }
  
    static final class Committer implements RecoverableFsDataOutputStream.Committer {
  
      Committer(final ProxyRecoverable recoverable) {
        this.recoverable = recoverable;
      }
  
      private final ProxyRecoverable recoverable;
  
      @Override
      public void commit() throws IOException {
        this.newWriter().commit();
      }
  
      @Override
      public void commitAfterRecovery() {
        // to do nothing.
      }
  
      @Override
      public RecoverableWriter.CommitRecoverable getRecoverable() {
        return this.recoverable;
      }
  
      private ProxyFileWriter<?> newWriter() throws IOException {
        final ProxyFileWriterFactory writerFactory =
            ProxyFileWriterFactory.newInstance(this.recoverable.getWriterType());
        if (writerFactory == null) {
          // TODO
          throw new UnsupportedOperationException();
        }
        writerFactory.setConfiguration(this.recoverable.getWriterConfiguration());
        return writerFactory.create(this.recoverable.getWriterIdentifier(),
            this.recoverable.getWritePath());
      }
  
    }
  
  }
  