{"action":"created","comment":{"url":"https://api.github.com/repos/opentracing/opentracing-java/pulls/comments/51610966","id":51610966,"diff_hunk":"@@ -0,0 +1,53 @@\n+/**\n+ * Copyright 2016 The OpenTracing Authors\n+ *\n+ * Licensed under the Apache License, Version 2.0 (the \"License\"); you may not use this file except\n+ * in compliance with the License. You may obtain a copy of the License at\n+ *\n+ * http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing, software distributed under the License\n+ * is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express\n+ * or implied. See the License for the specific language governing permissions and limitations under\n+ * the License.\n+ */\n+package opentracing;\n+\n+import java.util.Map;\n+\n+/**\n+ * Encodes or Decodes a {@linkplain Span} in binary or text formats.\n+ *\n+ * <p>The toXXX methods are expected to serialize spans into a pair of values representing\n+ * separately the span / span identity, and the trace attributes. This is done specifically\n+ * for binary protocols that may represent tracing identity in a dedicated fixed-length slot in the\n+ * binary message format, so that it can be inspected efficiently by the middleware / routing layers\n+ * without parsing the whole message.\n+ */\n+public interface SpanPropagator {\n+\n+  /**\n+   * Encodes the span into a binary representation of the span's identity and trace\n+   * attributes.\n+   */\n+  byte[] toBinary(Span span);","path":"opentracing/src/main/java/opentracing/SpanPropagator.java","position":null,"original_position":33,"commit_id":"60d90194e3a190fc63a769dff6366843d239aece","original_commit_id":"a3cbade0781482717faf37996ceca769454392b3","user":{"login":"bensigelman","id":2251553,"avatar_url":"https://avatars.githubusercontent.com/u/2251553?v=3","gravatar_id":"","url":"https://api.github.com/users/bensigelman","html_url":"https://github.com/bensigelman","followers_url":"https://api.github.com/users/bensigelman/followers","following_url":"https://api.github.com/users/bensigelman/following{/other_user}","gists_url":"https://api.github.com/users/bensigelman/gists{/gist_id}","starred_url":"https://api.github.com/users/bensigelman/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bensigelman/subscriptions","organizations_url":"https://api.github.com/users/bensigelman/orgs","repos_url":"https://api.github.com/users/bensigelman/repos","events_url":"https://api.github.com/users/bensigelman/events{/privacy}","received_events_url":"https://api.github.com/users/bensigelman/received_events","type":"User","site_admin":false},"body":"thank you for splitting it off -- happy to continue the discussion and ACK that it's not resolved.","created_at":"2016-02-02T18:24:24Z","updated_at":"2016-02-02T18:24:24Z","html_url":"https://github.com/opentracing/opentracing-java/pull/8#discussion_r51610966","pull_request_url":"https://api.github.com/repos/opentracing/opentracing-java/pulls/8","_links":{"self":{"href":"https://api.github.com/repos/opentracing/opentracing-java/pulls/comments/51610966"},"html":{"href":"https://github.com/opentracing/opentracing-java/pull/8#discussion_r51610966"},"pull_request":{"href":"https://api.github.com/repos/opentracing/opentracing-java/pulls/8"}}},"pull_request":{"url":"https://api.github.com/repos/opentracing/opentracing-java/pulls/8","id":57755476,"html_url":"https://github.com/opentracing/opentracing-java/pull/8","diff_url":"https://github.com/opentracing/opentracing-java/pull/8.diff","patch_url":"https://github.com/opentracing/opentracing-java/pull/8.patch","issue_url":"https://api.github.com/repos/opentracing/opentracing-java/issues/8","number":8,"state":"open","locked":false,"title":"Simplify the API: removing TraceContext and TraceContextSource","user":{"login":"michaelsembwever","id":559444,"avatar_url":"https://avatars.githubusercontent.com/u/559444?v=3","gravatar_id":"","url":"https://api.github.com/users/michaelsembwever","html_url":"https://github.com/michaelsembwever","followers_url":"https://api.github.com/users/michaelsembwever/followers","following_url":"https://api.github.com/users/michaelsembwever/following{/other_user}","gists_url":"https://api.github.com/users/michaelsembwever/gists{/gist_id}","starred_url":"https://api.github.com/users/michaelsembwever/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/michaelsembwever/subscriptions","organizations_url":"https://api.github.com/users/michaelsembwever/orgs","repos_url":"https://api.github.com/users/michaelsembwever/repos","events_url":"https://api.github.com/users/michaelsembwever/events{/privacy}","received_events_url":"https://api.github.com/users/michaelsembwever/received_events","type":"User","site_admin":false},"body":"- Remove TraceContext, as has already been done in the specification.\r\n- Remove TraceContextSource, as methods from it now belong in Tracer.\r\n- Remove Tracer.joinTrace(..) as Span.startChild(..) already does this.\r\n- Simplify the SpanPropagator. Having to split responsibilities for span and trace identification versus trace attributes is not something the end-user cares about.\r\n\r\nref:\r\n - https://github.com/opentracing/opentracing.github.io/pull/42\r\n - https://github.com/opentracing/opentracing-java/pull/","created_at":"2016-01-31T00:30:01Z","updated_at":"2016-02-02T18:24:24Z","closed_at":null,"merged_at":null,"merge_commit_sha":"0cf58ab045bd177bea09fccdba3f4fb2747b4ee8","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/opentracing/opentracing-java/pulls/8/commits","review_comments_url":"https://api.github.com/repos/opentracing/opentracing-java/pulls/8/comments","review_comment_url":"https://api.github.com/repos/opentracing/opentracing-java/pulls/comments{/number}","comments_url":"https://api.github.com/repos/opentracing/opentracing-java/issues/8/comments","statuses_url":"https://api.github.com/repos/opentracing/opentracing-java/statuses/60d90194e3a190fc63a769dff6366843d239aece","head":{"label":"opentracing:mck/simplified-api-design-1","ref":"mck/simplified-api-design-1","sha":"60d90194e3a190fc63a769dff6366843d239aece","user":{"login":"opentracing","id":15482765,"avatar_url":"https://avatars.githubusercontent.com/u/15482765?v=3","gravatar_id":"","url":"https://api.github.com/users/opentracing","html_url":"https://github.com/opentracing","followers_url":"https://api.github.com/users/opentracing/followers","following_url":"https://api.github.com/users/opentracing/following{/other_user}","gists_url":"https://api.github.com/users/opentracing/gists{/gist_id}","starred_url":"https://api.github.com/users/opentracing/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/opentracing/subscriptions","organizations_url":"https://api.github.com/users/opentracing/orgs","repos_url":"https://api.github.com/users/opentracing/repos","events_url":"https://api.github.com/users/opentracing/events{/privacy}","received_events_url":"https://api.github.com/users/opentracing/received_events","type":"Organization","site_admin":false},"repo":{"id":48295629,"name":"opentracing-java","full_name":"opentracing/opentracing-java","owner":{"login":"opentracing","id":15482765,"avatar_url":"https://avatars.githubusercontent.com/u/15482765?v=3","gravatar_id":"","url":"https://api.github.com/users/opentracing","html_url":"https://github.com/opentracing","followers_url":"https://api.github.com/users/opentracing/followers","following_url":"https://api.github.com/users/opentracing/following{/other_user}","gists_url":"https://api.github.com/users/opentracing/gists{/gist_id}","starred_url":"https://api.github.com/users/opentracing/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/opentracing/subscriptions","organizations_url":"https://api.github.com/users/opentracing/orgs","repos_url":"https://api.github.com/users/opentracing/repos","events_url":"https://api.github.com/users/opentracing/events{/privacy}","received_events_url":"https://api.github.com/users/opentracing/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/opentracing/opentracing-java","description":"","fork":false,"url":"https://api.github.com/repos/opentracing/opentracing-java","forks_url":"https://api.github.com/repos/opentracing/opentracing-java/forks","keys_url":"https://api.github.com/repos/opentracing/opentracing-java/keys{/key_id}","collaborators_url":"https://api.github.com/repos/opentracing/opentracing-java/collaborators{/collaborator}","teams_url":"https://api.github.com/repos/opentracing/opentracing-java/teams","hooks_url":"https://api.github.com/repos/opentracing/opentracing-java/hooks","issue_events_url":"https://api.github.com/repos/opentracing/opentracing-java/issues/events{/number}","events_url":"https://api.github.com/repos/opentracing/opentracing-java/events","assignees_url":"https://api.github.com/repos/opentracing/opentracing-java/assignees{/user}","branches_url":"https://api.github.com/repos/opentracing/opentracing-java/branches{/branch}","tags_url":"https://api.github.com/repos/opentracing/opentracing-java/tags","blobs_url":"https://api.github.com/repos/opentracing/opentracing-java/git/blobs{/sha}","git_tags_url":"https://api.github.com/repos/opentracing/opentracing-java/git/tags{/sha}","git_refs_url":"https://api.github.com/repos/opentracing/opentracing-java/git/refs{/sha}","trees_url":"https://api.github.com/repos/opentracing/opentracing-java/git/trees{/sha}","statuses_url":"https://api.github.com/repos/opentracing/opentracing-java/statuses/{sha}","languages_url":"https://api.github.com/repos/opentracing/opentracing-java/languages","stargazers_url":"https://api.github.com/repos/opentracing/opentracing-java/stargazers","contributors_url":"https://api.github.com/repos/opentracing/opentracing-java/contributors","subscribers_url":"https://api.github.com/repos/opentracing/opentracing-java/subscribers","subscription_url":"https://api.github.com/repos/opentracing/opentracing-java/subscription","commits_url":"https://api.github.com/repos/opentracing/opentracing-java/commits{/sha}","git_commits_url":"https://api.github.com/repos/opentracing/opentracing-java/git/commits{/sha}","comments_url":"https: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