import com.google.ipc.invalidation.common.ObjectIdDigestUtils.Sha1DigestFunction; //导入依赖的package包/类
/**
 * Returns a {@link AndroidTiclStateWithDigest} containing {@code ticlState} and its computed
 * digest.
 */
private static AndroidTiclStateWithDigest createDigestedState(
    AndroidInvalidationClientImpl ticl) {
  Sha1DigestFunction digester = new Sha1DigestFunction();
  ApplicationClientIdP ticlAppId = ticl.getApplicationClientIdP();
  Metadata metaData = Metadata.newBuilder()
       .setClientConfig(ticl.getConfig())
       .setClientName(ticlAppId.getClientName())
       .setClientType(ticlAppId.getClientType())
       .setTiclId(ticl.getSchedulingId())
       .build();
  AndroidTiclState state = AndroidTiclState.newBuilder()
      .setMetadata(metaData)
      .setTiclState(ticl.marshal())
      .setVersion(ProtocolIntents.ANDROID_PROTOCOL_VERSION_VALUE).build();
  digester.update(state.toByteArray());
  AndroidTiclStateWithDigest verifiedState = AndroidTiclStateWithDigest.newBuilder()
      .setState(state)
      .setDigest(ByteString.copyFrom(digester.getDigest()))
      .build();
  return verifiedState;
}
 

import com.google.ipc.invalidation.common.ObjectIdDigestUtils.Sha1DigestFunction; //导入依赖的package包/类
/**
 * Returns a {@link AndroidTiclStateWithDigest} containing {@code ticlState} and its computed
 * digest.
 */
private static AndroidTiclStateWithDigest createDigestedState(
    AndroidInvalidationClientImpl ticl) {
  Sha1DigestFunction digester = new Sha1DigestFunction();
  ApplicationClientIdP ticlAppId = ticl.getApplicationClientIdP();
  Metadata metadata = Metadata.create(ticlAppId.getClientType(), ticlAppId.getClientName(),
      ticl.getSchedulingId(), ticl.getConfig());
  AndroidTiclState state = AndroidTiclState.create(ProtocolIntents.ANDROID_PROTOCOL_VERSION_VALUE,
      ticl.marshal(), metadata,
      ((AndroidInternalScheduler) ticl.getResources().getInternalScheduler()).marshal());
  digester.update(state.toByteArray());
  AndroidTiclStateWithDigest verifiedState =
      AndroidTiclStateWithDigest.create(state, new Bytes(digester.getDigest()));
  return verifiedState;
}
 

import com.google.ipc.invalidation.common.ObjectIdDigestUtils.Sha1DigestFunction; //导入依赖的package包/类
/** Returns whether the digest in {@code state} is correct. */
private static boolean isDigestValid(AndroidTiclStateWithDigest state, Logger logger) {
  Sha1DigestFunction digester = new Sha1DigestFunction();
  digester.update(state.getState().toByteArray());
  byte[] computedDigest = digester.getDigest();
  if (!TypedUtil.<Bytes>equals(new Bytes(computedDigest), state.getDigest())) {
    logger.warning("Android TICL state digest mismatch; computed %s for %s",
        computedDigest, state);
    return false;
  }
  return true;
}
 

import com.google.ipc.invalidation.common.ObjectIdDigestUtils.Sha1DigestFunction; //导入依赖的package包/类
/** Returns whether the digest in {@code state} is correct. */
private static boolean isDigestValid(AndroidTiclStateWithDigest state, Logger logger) {
  Sha1DigestFunction digester = new Sha1DigestFunction();
  digester.update(state.getState().toByteArray());
  ByteString computedDigest = ByteString.copyFrom(digester.getDigest());
  if (!computedDigest.equals(state.getDigest())) {
    logger.warning("Android Ticl state digest mismatch; computed %s for %s",
        computedDigest, state);
    return false;
  }
  return true;
}