opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/md/sal/binding/impl/LazyDOMRpcResultFuture.java

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the terms of the Eclipse
   5  * Public License v1.0 which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.md.sal.binding.impl;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.base.Throwables;
  12 import com.google.common.util.concurrent.CheckedFuture;
  13 import com.google.common.util.concurrent.ListenableFuture;
  14 import java.util.concurrent.ExecutionException;
  15 import java.util.concurrent.Executor;
  16 import java.util.concurrent.TimeUnit;
  17 import java.util.concurrent.TimeoutException;
  18 import org.opendaylight.controller.md.sal.dom.api.DOMRpcException;
  19 import org.opendaylight.controller.md.sal.dom.api.DOMRpcResult;
  20 import org.opendaylight.controller.md.sal.dom.spi.DefaultDOMRpcResult;
  21 import org.opendaylight.yangtools.binding.data.codec.impl.BindingNormalizedNodeCodecRegistry;
  22 import org.opendaylight.yangtools.yang.binding.DataContainer;
  23 import org.opendaylight.yangtools.yang.common.RpcResult;
  24 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  25
  26 final class LazyDOMRpcResultFuture implements CheckedFuture<DOMRpcResult, DOMRpcException> {
  27
  28     private final ListenableFuture<RpcResult<?>> bindingFuture;
  29     private final BindingNormalizedNodeCodecRegistry codec;
  30     private volatile DOMRpcResult result;
  31
  32     private LazyDOMRpcResultFuture(final ListenableFuture<RpcResult<?>> delegate,
  33             final BindingNormalizedNodeCodecRegistry codec) {
  34         this.bindingFuture = Preconditions.checkNotNull(delegate, "delegate");
  35         this.codec = Preconditions.checkNotNull(codec, "codec");
  36     }
  37
  38     static CheckedFuture<DOMRpcResult, DOMRpcException> create(final BindingNormalizedNodeCodecRegistry codec,
  39             final ListenableFuture<RpcResult<?>> bindingResult) {
  40         return new LazyDOMRpcResultFuture(bindingResult, codec);
  41     }
  42
  43     ListenableFuture<RpcResult<?>> getBindingFuture() {
  44         return bindingFuture;
  45     }
  46
  47     @Override
  48     public boolean cancel(final boolean mayInterruptIfRunning) {
  49         return bindingFuture.cancel(mayInterruptIfRunning);
  50     }
  51
  52     @Override
  53     public void addListener(final Runnable listener, final Executor executor) {
  54         bindingFuture.addListener(listener, executor);
  55     }
  56
  57     @Override
  58     public DOMRpcResult get() throws InterruptedException, ExecutionException {
  59         if (result != null) {
  60             return result;
  61         }
  62         return transformIfNecessary(bindingFuture.get());
  63     }
  64
  65     @Override
  66     public DOMRpcResult get(final long timeout, final TimeUnit unit) throws InterruptedException, ExecutionException,
  67             TimeoutException {
  68         if (result != null) {
  69             return result;
  70         }
  71         return transformIfNecessary(bindingFuture.get(timeout, unit));
  72     }
  73
  74     @Override
  75     public DOMRpcResult checkedGet() throws DOMRpcException {
  76         try {
  77             return get();
  78         } catch (InterruptedException | ExecutionException e) {
  79             // FIXME: Add exception mapping
  80             throw Throwables.propagate(e);
  81         }
  82     }
  83
  84     @Override
  85     public DOMRpcResult checkedGet(final long timeout, final TimeUnit unit) throws TimeoutException, DOMRpcException {
  86         try {
  87             return get(timeout, unit);
  88         } catch (InterruptedException | ExecutionException e) {
  89             // FIXME: Add exception mapping
  90             throw Throwables.propagate(e);
  91         }
  92     }
  93
  94     @Override
  95     public boolean isCancelled() {
  96         return bindingFuture.isCancelled();
  97     }
  98
  99     @Override
 100     public boolean isDone() {
 101         return bindingFuture.isDone();
 102     }
 103
 104     private synchronized DOMRpcResult transformIfNecessary(final RpcResult<?> input) {
 105         if (result == null) {
 106             result = transform(input);
 107         }
 108         return result;
 109     }
 110
 111     private DOMRpcResult transform(final RpcResult<?> input) {
 112         if (input.isSuccessful()) {
 113             final Object inputData = input.getResult();
 114             if (inputData instanceof DataContainer) {
 115                 return new DefaultDOMRpcResult(codec.toNormalizedNodeRpcData((DataContainer) inputData));
 116             } else {
 117                 return new DefaultDOMRpcResult((NormalizedNode<?, ?>) null);
 118             }
 119         }
 120         return new DefaultDOMRpcResult(input.getErrors());
 121     }
 122
 123 }